Neodymium magnets: questions and answers
Choosing a magnet, placing an order and using it safely.
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Basics: what are magnets?
Definitions, chemical composition, and basic differences between materials.
What is a neodymium magnet?
It is the strongest type of permanent magnet commercially available on Earth. It is made of sintered powdered elements, mainly Neodymium, Iron, and Boron.
Chemical formula and structure:
The basic component is the tetragonal phase Nd2Fe14B. This structure has exceptionally high magnetocrystalline anisotropy, which means it is very difficult to change the direction of its magnetization. This feature gives neodymium magnets such huge coercivity (resistance to demagnetization) and allows them to store powerful magnetic energy in a small volume.
Chemical formula and structure:
The basic component is the tetragonal phase Nd2Fe14B. This structure has exceptionally high magnetocrystalline anisotropy, which means it is very difficult to change the direction of its magnetization. This feature gives neodymium magnets such huge coercivity (resistance to demagnetization) and allows them to store powerful magnetic energy in a small volume.
What are 'rare earth metals' and why are they important?
This is a group of 17 chemical elements that are key to modern technology. Neodymium (Nd) is the most important of them in magnet production.
Full list of Rare Earth Elements (REE):
Full list of Rare Earth Elements (REE):
- Scandium (Sc, 21)
- Yttrium (Y, 39)
- Lanthanum (La, 57)
- Cerium (Ce, 58)
- Praseodymium (Pr, 59)
- Neodymium (Nd, 60) – key component of magnets
- Promethium (Pm, 61)
- Samarium (Sm, 62) – used in SmCo magnets
- Europium (Eu, 63)
- Gadolinium (Gd, 64)
- Terbium (Tb, 65) – additive increasing temperature resistance
- Dysprosium (Dy, 66) – same as above
- Holmium (Ho, 67)
- Erbium (Er, 68)
- Thulium (Tm, 69)
- Ytterbium (Yb, 70)
- Lutetium (Lu, 71)
What is the difference between a neodymium and a ferrite (black) magnet?
The difference is gigantic, both in power and applications. A neodymium magnet is about 10 times stronger than a ferrite one of the same dimensions.
Comparison of properties:
Comparison of properties:
- Strength (BHmax): Neodymium (up to 52 MGOe) vs Ferrite (up to 4 MGOe).
- Appearance: Neodymium is silver (nickel-plated), Ferrite is dark gray/black (ceramic).
- Corrosion: Neodymium rusts very easily (must have a coating), Ferrite is completely resistant to rust (iron oxide).
- Price: Neodymiums are much more expensive due to the content of rare earth elements.
- Conductivity: Neodymium conducts electricity (metal), Ferrite is an insulator.
Technical parameters and physics
Detailed knowledge for engineers and constructors.
What magnet sizes do you have in the catalogue?
The Dhit.pl catalogue covers four shapes in the following ranges:
Discs and cylinders – diameter 1–250 mm, height 1–80 mm.
Blocks and plates – length 1–200 mm, width 1–100 mm, height 1–80 mm.
Rings – outer diameter 2.5–250 mm, inner diameter 0.8–230 mm, height 1–80 mm.
Spheres – diameter 3–100 mm.
The ranges come from the tooling used at the factory, so they apply regardless of magnet grade – the same for N38 as for N52. Sizes outside these ranges are made to order.
Discs and cylinders – diameter 1–250 mm, height 1–80 mm.
Blocks and plates – length 1–200 mm, width 1–100 mm, height 1–80 mm.
Rings – outer diameter 2.5–250 mm, inner diameter 0.8–230 mm, height 1–80 mm.
Spheres – diameter 3–100 mm.
The ranges come from the tooling used at the factory, so they apply regardless of magnet grade – the same for N38 as for N52. Sizes outside these ranges are made to order.
What is the thinnest plate magnet you offer?
1 mm. That is the lowest thickness at which a plate magnet keeps a usable pull force and can still be mounted safely. Thinner sintered blanks are very brittle and crack easily when they snap onto steel.
Does connecting two magnets double their strength?
No, the strength does not double. This is a common myth. Adding a second identical magnet (increasing the stack height) will increase the field strength, but not linearly.
Stack physics:
Two magnets joined by attracting poles will be about 30% to 60% stronger (depending on their diameter and thickness), not 100%. The higher the stack of magnets (relative to the diameter), the less power gain each subsequent magnet provides, up to the point of saturation where adding more has no effect.
Stack physics:
Two magnets joined by attracting poles will be about 30% to 60% stronger (depending on their diameter and thickness), not 100%. The higher the stack of magnets (relative to the diameter), the less power gain each subsequent magnet provides, up to the point of saturation where adding more has no effect.
Is there a material that completely blocks a magnetic field?
From a physics point of view, you cannot completely block a magnetic field, you can only shield (redirect) it.
How to do it?
To "close" a magnetic field, use a material with high magnetic permeability (ferromagnetic), which acts as a highway for the field flux. The best materials are:
How to do it?
To "close" a magnetic field, use a material with high magnetic permeability (ferromagnetic), which acts as a highway for the field flux. The best materials are:
- Mu-metal: A special nickel-iron alloy (expensive, very effective).
- Soft steel sheet: Thick steel sheet effectively closes the field (cheap solution).
What do the symbols N38, N42, N52 mean?
N38, N42 and N52 indicate the energy grade of the material, not the pull force of a finished product. The number refers to the maximum energy product BHmax, expressed in MGOe.
Also check dimensions, magnetisation direction and operating temperature. A higher grade does not in itself mean greater heat resistance. The N50, N52 and N54 models we sell have a 60°C limit; always check the specific product page.
Also check dimensions, magnetisation direction and operating temperature. A higher grade does not in itself mean greater heat resistance. The N50, N52 and N54 models we sell have a 60°C limit; always check the specific product page.
What are the temperature classes of magnets (H, SH, UH)?
Check the operating temperature on the specific product page. Our N50, N52 and N54 models have a 60°C limit. Do not apply a general 80°C limit to all neodymium magnets.
Additional designations such as H, SH and UH distinguish material variants with different temperature characteristics. For a heated device, specify its temperature and working conditions rather than choosing a magnet solely by its energy grade.
Additional designations such as H, SH and UH distinguish material variants with different temperature characteristics. For a heated device, specify its temperature and working conditions rather than choosing a magnet solely by its energy grade.
What is remanence (Br) and coercivity (HcJ)?
These are two key parameters describing every magnet in physics.
Remanence (Br):
This is the so-called magnetic remanence. It determines how strong a magnetic flux remains in the material after its saturation. For neodymiums, it is usually from 1.1 to 1.48 Tesla. This parameter speaks about the 'strength' of the magnet.
Coercivity (HcJ):
This is the magnetic field intensity needed to completely demagnetize the material. The higher the coercivity, the harder it is to 'spoil' the magnet through external fields or temperature. Neodymiums have very high coercivity, which is why we call them permanent magnets.
Remanence (Br):
This is the so-called magnetic remanence. It determines how strong a magnetic flux remains in the material after its saturation. For neodymiums, it is usually from 1.1 to 1.48 Tesla. This parameter speaks about the 'strength' of the magnet.
Coercivity (HcJ):
This is the magnetic field intensity needed to completely demagnetize the material. The higher the coercivity, the harder it is to 'spoil' the magnet through external fields or temperature. Neodymiums have very high coercivity, which is why we call them permanent magnets.
How many Gauss does a neodymium magnet have?
Internal induction (Br) is often confused with surface induction.
Measurements:
Measurements:
- Inside the material (Br): 11,000 - 14,800 Gauss (1.1 - 1.48 T).
- On the pole surface: Depends on the shape! A flat plate magnet may have 2,500 Gauss, and a long N52 cylinder even 6,500 Gauss at the center of the pole. Usually, it is from 0.3 to 0.6 Tesla.
How to identify magnet poles (where are N and S)?
Neodymium magnets rarely have factory markings. You can check this in 3 ways: 1. Compass: Remember that the North needle of a compass (N) is attracted to the South pole of a magnet (S). 2. App: Smartphones have a magnetometer – 'Pole Detector' apps will indicate the polarity. 3. Another magnet: If you have a reference magnet with markings, check which side repels (like poles repel).
Practical applications
Inspirations for home, workshop, and industry.
Does a neodymium magnet stop a water meter? (Important!)
Technically, a strong magnetic field can disrupt the operation of older rotor counters, magnetic couplings in water meters, or discs in electricity meters.
Legal warning:
Using magnets for this purpose is illegal and treated as theft of utilities (energy, water, gas). Modern meters are equipped with special magnetic field strips/indicators. Bringing a neodymium close causes an irreversible color change of the indicator or logs an error in the electronic meter's memory. During an inspection, this is irrefutable proof of manipulation, which results in huge financial penalties (often counted in thousands of zlotys) and criminal proceedings.
Legal warning:
Using magnets for this purpose is illegal and treated as theft of utilities (energy, water, gas). Modern meters are equipped with special magnetic field strips/indicators. Bringing a neodymium close causes an irreversible color change of the indicator or logs an error in the electronic meter's memory. During an inspection, this is irrefutable proof of manipulation, which results in huge financial penalties (often counted in thousands of zlotys) and criminal proceedings.
Is it worth using a magnet on a car oil filter?
Yes, it is a very cheap and effective way to protect the engine.
How does it work?
During engine operation, microscopic metal filings are created (wear of bearings, rings, shafts). The paper oil filter catches impurities down to approx. 20-30 microns. Smaller filings circulate in the oil, acting like abrasive paste. Attaching a strong neodymium magnet to the filter housing (or drain plug) catches ferromagnetic particles from the flowing oil, 'gluing' them to the wall. When changing the oil and filter, you throw away these impurities along with the old filter.
How does it work?
During engine operation, microscopic metal filings are created (wear of bearings, rings, shafts). The paper oil filter catches impurities down to approx. 20-30 microns. Smaller filings circulate in the oil, acting like abrasive paste. Attaching a strong neodymium magnet to the filter housing (or drain plug) catches ferromagnetic particles from the flowing oil, 'gluing' them to the wall. When changing the oil and filter, you throw away these impurities along with the old filter.
Why do regular magnets fall off a glass magnetic board?
Glass boards are a challenge for magnets.
Physics of the problem:
Such a board consists of a steel sheet covered with a thick pane of glass (usually 4-6 mm). Glass creates a huge 'air gap'. The attraction force of a magnet decreases drastically with distance (inverse square law). Ordinary black ferrite magnets are too weak to penetrate through the glass. You need large, thick neodymium magnets (e.g., cylinders 20x10mm or cubes) that generate a sufficiently deep magnetic field.
Physics of the problem:
Such a board consists of a steel sheet covered with a thick pane of glass (usually 4-6 mm). Glass creates a huge 'air gap'. The attraction force of a magnet decreases drastically with distance (inverse square law). Ordinary black ferrite magnets are too weak to penetrate through the glass. You need large, thick neodymium magnets (e.g., cylinders 20x10mm or cubes) that generate a sufficiently deep magnetic field.
Which magnet opens security tags?
To open store security tags (clips), special magnetic detachers with a specific field shape (often concave) are used. A regular flat neodymium magnet, even a strong one, may not work because the field must be focused inside the clip lock. We offer professional detachers for boutiques and clothing stores.
How to use magnets for curtains and drapes?
This is a decorating hit. Instead of drilling hooks into walls, use magnetic tiebacks. You need two magnets (preferably cylindrical, e.g., 10x10mm or larger for thick drapes), covered in fabric or connected by a decorative cord. This allows you to style curtains freely, and the magnets 'release' when pulled, preventing fabric damage.
How to make an invisible cabinet lock (child safety)?
A magnet can act as a catch to hold a cabinet door closed, but an ordinary magnetic catch must not be treated as a child safety lock. Choose a force suited to the door and ensure the components are securely fixed and inaccessible to children.
If you need a child safety lock, choose a dedicated system and follow its instructions.
If you need a child safety lock, choose a dedicated system and follow its instructions.
What are welding magnets used for?
In locksmithing and welding, magnets act as a 'third hand'. Magnetic welding angles allow you to precisely position pipes or profiles at 45°, 90°, or 135° angles without an assistant. There are also magnetic ground clamps – allowing you to instantly attach the welder's ground cable to any point on a metal table or workpiece.
How to mount a mosquito net with magnets (no drilling)?
This is the best way for a removable mosquito net. Use magnetic tape (Part A on the window frame, Part B on the net frame) or small neodymium magnets glued in the corners. This allows you to remove the net in one motion for winter storage or window cleaning without any hassle.
Can neodymium magnets be put in an aquarium?
Only if they are specially protected. The standard coating (Nickel-Copper-Nickel) is not perfectly watertight and will start to corrode in continuous contact with water. Warning: Neodymium and copper oxides released into the water are toxic to fish and invertebrates. For aquariums, use only magnets encased in sealed plastic (waterproof) or coated with a thick layer of epoxy resin.
Which magnets are best for building a generator (wind turbine)?
For building generators (axial flux PMG), large block magnets (e.g., 40x10x5mm or larger) of grade N38 or N42 are most commonly used. It is crucial to position them precisely on the rotor (discs) with alternating N and S poles. We recommend using epoxy glue to bond them, and then casting the whole assembly in resin so that centrifugal force does not rip the magnets out during rotation.
How to magnetize a screwdriver with a magnet?
This is a useful workshop trick. To make a screwdriver hold screws, simply slide a strong neodymium magnet along the metal shaft of the screwdriver several times in one direction (from the handle to the tip). This aligns the magnetic domains in the tool steel. To demagnetize it, slide the magnet in the opposite direction or lightly tap the tool against a table.
How to make your own photo fridge magnet?
You can use self-adhesive magnetic sheet to make a photo magnet. Attach the print to the sheet according to the manufacturer's instructions and trim the edges.
Before placing it on a refrigerator, clean both surfaces and check that the material does not scratch the finish. Keep small, detachable pieces out of the reach of children.
Before placing it on a refrigerator, clean both surfaces and check that the material does not scratch the finish. Keep small, detachable pieces out of the reach of children.
Prices, buying, and metals market
Why do prices change and how to buy cheaper?
Why are neodymium magnets so expensive?
The price results from raw material costs. Neodymium (Nd) and Dysprosium (Dy) are rare earth metals. Their extraction is difficult, expensive, and monopolized by China. Magnet prices are directly linked to the stock market quotes of these elements. Additionally, the complicated sintering and processing of hard material increases the production cost.
Do you offer wholesale prices for companies?
Yes. As a direct importer, we serve factories and advertising agencies. For carton (bulk) or pallet orders, we offer individual discount thresholds. Contact our B2B department to receive a quote.
Is it worth importing magnets yourself from China (AliExpress)?
Before buying, compare dimensions, material grade, coating, operating temperature and the method used to specify pull force. A name or photo alone is not enough to compare products.
Our product pages show specifications, availability and quantity price tiers. If you need documents for a business purchase, agree their scope before ordering.
Our product pages show specifications, availability and quantity price tiers. If you need documents for a business purchase, agree their scope before ordering.
Physics and Expert Knowledge (Encyclopedia)
Detailed technical information about grades, coatings, and magnetic interactions.
Does a neodymium magnet attract gold, silver, and coins?
This is one of the most frequently asked questions by treasure hunters. Pure gold, silver, and bronze are diamagnetic, meaning they are not attracted by magnets and are even slightly repelled. If a magnet attracts jewelry, it means it is not made of pure precious metal but contains ferromagnetic alloys (e.g., iron, nickel). However, neodymium magnets are excellent for finding old coins containing iron as well as military artifacts.
What do the symbols N38, N42, N50, N52 mean?
N38, N42, N50 and N52 are material energy grades. They do not directly convert into pull force: dimensions, shape and contact conditions also matter.
The N50, N52 and N54 models in our range have a 60°C operating limit. Compare specific product specifications instead of assuming a higher number is better for every application.
The N50, N52 and N54 models in our range have a 60°C operating limit. Compare specific product specifications instead of assuming a higher number is better for every application.
Can a strong magnet damage a phone or credit card?
Yes, strong magnetic fields can interfere with electronics. We recommend keeping a safe distance of at least 15 cm (6 inches) from: smartphones (affects compass/sensors), credit cards with magnetic strips, mechanical watches, and pacemakers. Modern storage devices like SSDs and USB drives are generally safe.
Do neodymium magnets lose power over time?
Neodymium magnets are permanent magnets, but overheating, corrosion and mechanical damage can impair their properties. Store them in a dry place and observe the operating temperature of the specific model.
Our N50, N52 and N54 models have a 60°C limit. Do not apply a general 80°C value to every grade.
Our N50, N52 and N54 models have a 60°C limit. Do not apply a general 80°C value to every grade.
Orders and delivery
Orders, logistics, and payments
Everything about the purchasing process, B2B invoices, and international shipping.
What payment methods are available?
We offer a wide range of safe payment methods: quick online transfers via BLIK, traditional bank transfer, as well as cash or card payment to the courier upon delivery (COD).
Transaction details:
All electronic transactions are encrypted with SSL protocol (256-bit). In the case of a traditional transfer, we ship the goods after the payment is credited (usually the next business day). Cash on delivery allows for immediate shipping. Full transfer details can be found in the transport and payments tab.
Transaction details:
All electronic transactions are encrypted with SSL protocol (256-bit). In the case of a traditional transfer, we ship the goods after the payment is credited (usually the next business day). Cash on delivery allows for immediate shipping. Full transfer details can be found in the transport and payments tab.
How long does shipping take?
Items available in stock are normally dispatched within 24 hours on business days. Orders placed and paid for, or placed with cash on delivery, by 14:00 are usually dispatched the same day.
Check the selected product page: made-to-order items may take longer. Dispatch means handing the parcel to the carrier, not a guaranteed delivery date. See shipping and payment information.
Check the selected product page: made-to-order items may take longer. Dispatch means handing the parcel to the carrier, not a guaranteed delivery date. See shipping and payment information.
What are the delivery costs?
The cost depends on the total weight of the order and the selected method (Courier, Parcel Locker, Pallet). We offer free delivery for orders above a certain amount.
Why does weight matter?
Neodymium magnets are heavy (density similar to steel). A small package can weigh several kilograms. The cart system automatically sums up the weight of all products and selects the cheapest option. The detailed price list can be found in the transport section.
Why does weight matter?
Neodymium magnets are heavy (density similar to steel). A small package can weigh several kilograms. The cart system automatically sums up the weight of all products and selects the cheapest option. The detailed price list can be found in the transport section.
Do you issue VAT invoices for companies?
Yes, we are a registered VAT payer. We issue a full 23% VAT invoice for every order.
Information for accounting:
The invoice is generated automatically after the goods are shipped and sent in PDF format to the e-mail address provided in the order (according to the 'paperless' idea). If you need a paper invoice attached to the package, please include this information in the order notes. We also handle ICS (Intra-Community Supply) transactions with a 0% VAT rate for EU companies with an active VAT-EU number.
Information for accounting:
The invoice is generated automatically after the goods are shipped and sent in PDF format to the e-mail address provided in the order (according to the 'paperless' idea). If you need a paper invoice attached to the package, please include this information in the order notes. We also handle ICS (Intra-Community Supply) transactions with a 0% VAT rate for EU companies with an active VAT-EU number.
How fast do you answer a wholesale enquiry?
Within 24 business hours for standard catalogue magnets. Within 48 business hours for custom projects that need engineering consultation with the factory.
Do you offer deferred payment terms?
Yes, for regular business partners. We normally apply 7, 14 or 30 day terms. The term runs from the invoice date, and we issue the invoice on the day the goods are dispatched. Deferred payment is granted once cooperation is established.
Do you ship magnets abroad?
Yes, we ship to all European Union countries. The cost of international shipping is calculated automatically in the cart after selecting the delivery country.
Transport restrictions:
Due to the strong magnetic field, air transport (outside Europe) is subject to restrictive IATA regulations (Class 9 dangerous goods). Therefore, we standardly offer road transport within Europe. If you wish to order air shipping (e.g., to the USA), please contact us individually for a quote on special shielding packaging.
Transport restrictions:
Due to the strong magnetic field, air transport (outside Europe) is subject to restrictive IATA regulations (Class 9 dangerous goods). Therefore, we standardly offer road transport within Europe. If you wish to order air shipping (e.g., to the USA), please contact us individually for a quote on special shielding packaging.
Can magnets be transported by plane (Luggage and Cargo IATA)?
Air transport is subject to strict IATA regulations (dangerous goods) because the magnetic field can interfere with navigational instruments.
For passengers:
To pass clearance, we use professional field neutralization methods:
1. Alternating arrangement: Magnets are packed so that the N pole is adjacent to the S pole (closing the magnetic circuit).
2. Shielding: The package is lined with steel sheet. The carrier may require a DGD declaration.
For passengers:
- Hand luggage: Usually prohibited. If security detects attraction, the magnet will be confiscated.
- Checked baggage: Allowed under the condition of solid shielding. At DHIT, we recommend wrapping the magnet in a thick layer of Styrofoam and enclosing it in a steel can to trap the field inside.
To pass clearance, we use professional field neutralization methods:
1. Alternating arrangement: Magnets are packed so that the N pole is adjacent to the S pole (closing the magnetic circuit).
2. Shielding: The package is lined with steel sheet. The carrier may require a DGD declaration.
What documents are required for transporting magnets?
In air and sea transport, carriers often require confirmation that the cargo is safe.
As a supplier, we provide the necessary documentation:
As a supplier, we provide the necessary documentation:
- MSDS / SDS (Safety Data Sheet): A document describing the physical properties of the material (essential for customs clearance).
- DGD (Dangerous Goods Declaration): A declaration for air transport confirming that the magnetic field outside the package does not exceed IATA standards.
- Packaging Certificate: Confirmation of the use of appropriate shielding (steel sheet).
Where is the Dhit physical store located?
Our headquarters and warehouse are located in Ożarów Mazowiecki at ul. Kościuszki 6A. We mainly conduct mail-order sales, ensuring fast courier delivery (GLS/InPost) throughout Poland and EU.
Why Dhit? (Manufacturer & trust)
Why it is worth choosing the Polish brand Dhit over random offers.
Why do companies choose Dhit instead of anonymous shops?
Dhit is a direct importer of neodymium magnets and a manufacturer of magnetic separators. The company has operated since 2005, with its office and warehouse in Ożarów Mazowiecki, Poland.
In the shop you can compare the specifications, availability and quantity-price tiers of a particular product. Read our information for businesses.
In the shop you can compare the specifications, availability and quantity-price tiers of a particular product. Read our information for businesses.
How do you check magnet quality on delivery from the factory?
We take a random sample from every new batch. We check dimensional accuracy and magnetic induction – measured with a gaussmeter.
Do you handle public tenders?
For tender-related supply enquiries, send the specification, quantities, deadline and list of required documents. Feasibility and documentation must be confirmed for the specific product or design. Send an enquiry.
What can I check before buying directly from Dhit?
Each product page shows dimensions, grade, specifications, availability and prices for the listed quantity tiers. Compare the exact version before ordering, not just the model name.
For business purchases, see our B2B information. For project-specific selection, include the working conditions and required dimensions in your enquiry.
For business purchases, see our B2B information. For project-specific selection, include the working conditions and required dimensions in your enquiry.
Where to buy neodymium magnets in Ożarów Mazowiecki / Warsaw?
Dhit’s office and warehouse are at Kościuszki 6A, 05-850 Ożarów Mazowiecki, Poland. Before visiting, check contact details and directions and the availability of your selected product.
Items available in stock are normally dispatched within 24 hours on business days. The delivery date depends on the carrier and is not the same as the dispatch date.
Items available in stock are normally dispatched within 24 hours on business days. The delivery date depends on the carrier and is not the same as the dispatch date.
Does Dhit fulfill orders for industry and tenders?
Yes. We specialize in serving the B2B sector. We supply magnets for the automation, automotive, POS advertising, and food processing industries. We offer deferred payment terms for regular partners and budget institutions.
What does the GOLD hologram mean?
The GOLD hologram identifies original DHIT products. It does not replace the specifications: check the exact model, grade and pull-force measurement method before purchasing.
The company has operated since 2005, formerly as Xinxin Polska. Compare the specifications of a particular holder rather than its housing colour alone.
The company has operated since 2005, formerly as Xinxin Polska. Compare the specifications of a particular holder rather than its housing colour alone.
Magnet fishing
Magnet fishing (underwater search)
Equipment selection, GOLD series (3 eyelets), technical tips, and law.
How do F200 GOLD, F300 GOLD and F550 Silver Black differ?
They differ in housing, magnets and pull force. All F-series holders have magnets on both sides and attract from both sides.
- F200 GOLD: approximately 250 kg vertical and 38 kg with a side attachment.
- New F300 GOLD: approximately 330 kg vertical and 58 kg sideways; all threads are M10. The older F300 has approximately 360 kg vertical and 64 kg sideways, with a different housing and threads.
- F550 Silver Black: an asymmetric arrangement with magnets 10 mm and 5 mm thick on opposite sides.
Which magnet should I choose for my first magnet-fishing trip?
Start by comparing the lighter F200 GOLD with the new F300 GOLD. F200 GOLD has approximately 250 kg vertical and 38 kg sideways pull force; the new F300 GOLD has approximately 330 kg and 58 kg respectively.
Consider the weight of the set, your casting technique and your ability to detach it safely. The rated pull force is not the weight of an object you will always retrieve from water. It depends on factors including force direction, contact area and the condition of the metal. See the comparison and measurement method.
Consider the weight of the set, your casting technique and your ability to detach it safely. The rated pull force is not the weight of an object you will always retrieve from water. It depends on factors including force direction, contact area and the condition of the metal. See the comparison and measurement method.
Which rope for the magnet? (Technical parameters)
Choose the rope for the specific holder and working conditions, and check its strength specification. The standard rope in our sets is blue, 8 mm in diameter and 25 m long, from a Polish manufacturer.
Check whether the selected product includes a rope. Knots and other components affect the strength of the assembly, so do not infer it from rope diameter alone. Read the guide to choosing a set.
Check whether the selected product includes a rope. Knots and other components affect the strength of the assembly, so do not infer it from rope diameter alone. Read the guide to choosing a set.
Is magnet fishing legal in Poland (2026)?
The topic arouses controversy, but the law is precise regarding monuments and weapons. Casting a magnet into the water itself is not prohibited (it is not fishing), but what is key is WHAT you pull out.
Legal interpretation:
Legal interpretation:
- Monuments (Act on the Protection of Monuments): Searching for hidden or abandoned monuments using electronic and technical devices (including magnets) requires a permit from the Provincial Conservator of Monuments (WKZ). If you pull out an old sword, coin, or tank part – it becomes the property of the State Treasury. Appropriation is a crime.
- Weapons and unexploded ordnance (Act on Weapons and Ammunition): Fishing out a gun or grenade imposes on you the obligation to immediately notify the Police (112). You must not move it, take it home, or clean it. This is a deadly threat (unexploded ordnance is chemically unstable) and a criminal risk (up to 8 years in prison for possession).
- Utility scrap: Pulling out modern trash (caps, pipes, cans) is treated as cleaning the environment and is allowed, unless the regulations of a given water body (e.g., PZW) state otherwise.
How to care for the magnet after fishing? (Corrosion and chemistry)
River water is a chemical cocktail. Neodymium (Nd), which is part of the magnet, is a very reactive element and without a coating, it oxidizes (rusts) before your eyes, turning into powder.
Maintenance procedure:
1. Washing: After fishing, rinse the magnet with clean tap water (wash off silt, algae, and humic acids).
2. Drying: This is key. Wipe it dry. Water trapped in the handle housing will cause the core to swell and the nickel coating to crack.
3. Maintenance: Lubricate the steel handle housing with oil, WD-40, or wax. The steel housing (even galvanized) loses its protective layer over time from hitting the bottom. F550 Silver Black models have better factory resistance, but also require care.
Maintenance procedure:
1. Washing: After fishing, rinse the magnet with clean tap water (wash off silt, algae, and humic acids).
2. Drying: This is key. Wipe it dry. Water trapped in the handle housing will cause the core to swell and the nickel coating to crack.
3. Maintenance: Lubricate the steel handle housing with oil, WD-40, or wax. The steel housing (even galvanized) loses its protective layer over time from hitting the bottom. F550 Silver Black models have better factory resistance, but also require care.
What to do if the magnet gets stuck in a snag? (Vector physics)
A magnet with a lifting capacity of 300kg sucked onto a flat bulkhead driven into the bottom is impossible to detach with human muscle strength if you pull straight towards yourself (along the vector of attraction force).
Rescue techniques:
Rescue techniques:
- Change the vector (Angle): Walk 50-100 meters sideways along the bank. By pulling at an angle, you change the peeling force (the greatest) into a shearing force (sliding), which is about 80% lower. The magnet will slide to the edge of the obstacle and let go.
- 'Shot' method: Tension the rope like a guitar string and release it abruptly. The shock wave on the rope can break the magnet's grip.
- Leverage: Use a thick branch as a lever, wrapping the rope around it.
- Last resort: Hand winch or car winch. Remember – the rope has its breaking strength!
What can be found in the water? (Real finds)
Water hides the history of the last 100 years. Polish rivers and lakes are full of surprises.
Finds statistics:
Finds statistics:
- 80% - Scrap: Caps, nails, wires, fence fragments, cans, parts of agricultural machinery.
- 15% - Utility items: Bicycles, scooters, workshop tools (wrenches, hammers), fishing rods, phones, and even safes (usually empty after theft).
- 5% - Militaria and history: Bayonets, helmets, casings, weapon parts, uniform buttons. Most people start their adventure with Magnet Fishing for this 5%.
Which knot is the strongest for a magnet?
A bad knot weakens the rope by up to 50%. In Magnet Fishing, we recommend two knots: the Palomar Knot (very simple and retaining up to 95% of the rope's strength) or the Double Figure-Eight (a climbing classic, easy to untie after tightening). Avoid simple overhand knots and never hook the rope directly onto the sharp metal of the eyelet – use a thimble or proven hitch knots.
Meteorite hunting and geology
Identification of stones and mineral separation.
Does every meteorite attract a magnet?
Most do. Over 90% of meteorites (chondrites, siderites) contain nickel-iron, which reacts to a magnet. A strong neodymium magnet is a basic tool for a meteorite hunter. However, remember that attraction does not give 100% certainty – magnetite (an earthly stone) also reacts to a magnet.
How to separate black sand from gold?
Gold prospectors use magnets to separate so-called 'black sand' (magnetite) from the pan. Magnets in a special housing with a release mechanism are used for this (so you don't have to clean the magnet of filings by hand). The magnet pulls out the black sand, leaving the gold, which is non-magnetic, at the bottom of the pan.
Fitting and safety
Mounting, gluing, and processing
How to safely join magnets with other materials.
Which glue is best for magnets?
Magnets have a smooth, nickel-plated surface that is difficult to glue.
Recommendations:
The best results are obtained with two-component epoxy glues (e.g., Distal, Poxipol, UHU Endfest 300). They create a hard joint that fills irregularities well. For very small magnets, cyanoacrylate glues ('SuperGlue') can be used, but they are brittle and may let go upon impact. The magnet surface should be degreased before gluing (alcohol, acetone) and gently roughened with sandpaper (watch out for dust!).
Recommendations:
The best results are obtained with two-component epoxy glues (e.g., Distal, Poxipol, UHU Endfest 300). They create a hard joint that fills irregularities well. For very small magnets, cyanoacrylate glues ('SuperGlue') can be used, but they are brittle and may let go upon impact. The magnet surface should be degreased before gluing (alcohol, acetone) and gently roughened with sandpaper (watch out for dust!).
Can I use hot glue?
We do not recommend hot glue for neodymium magnets. Heat during bonding can exceed the specific product's limit and permanently weaken it; our N50, N52 and N54 models have a 60°C limit.
Choose an adhesive suited to the magnet's coating and the substrate, and check the application and curing temperatures in the adhesive manufacturer's instructions.
Choose an adhesive suited to the magnet's coating and the substrate, and check the application and curing temperatures in the adhesive manufacturer's instructions.
How to safely separate two strong magnets?
Forceful tearing (pulling in opposite directions) is doomed to fail with strong magnets.
Sliding technique:
1. Place the joined magnets on the edge of a stable, wooden table (wood is not magnetic).
2. Lean one magnet against the tabletop and slide the other one off the edge.
3. Pressing hard, slide one magnet off the other downwards. The shear force needed to move it is much smaller than the pulling force.
4. Immediately move the magnets away from each other to a safe distance (min. 50 cm) so they don't 'snap' back (this risks crushing fingers and breaking magnets).
Sliding technique:
1. Place the joined magnets on the edge of a stable, wooden table (wood is not magnetic).
2. Lean one magnet against the tabletop and slide the other one off the edge.
3. Pressing hard, slide one magnet off the other downwards. The shear force needed to move it is much smaller than the pulling force.
4. Immediately move the magnets away from each other to a safe distance (min. 50 cm) so they don't 'snap' back (this risks crushing fingers and breaking magnets).
How to correctly use self-adhesive magnets (3M tape)?
For a self-adhesive magnet to hold permanently: 1. The surface must be smooth, clean, and degreased (isopropyl alcohol). 2. After sticking, press the magnet firmly for a few seconds. 3. Wait 24h before loading – the glue needs time to set (cross-link). Gluing cold or to rough walls (plaster) usually ends in detachment.
Can I cut a neodymium magnet with an angle grinder?
Do not cut or grind neodymium magnets at home. The material is brittle and can chip, while machining dust presents a fire hazard. Heating can permanently weaken the magnet.
Check the temperature limit on the product page; our N50, N52 and N54 models have a 60°C limit. Instead of modifying a finished magnet, choose the correct size or ask about a custom-made product.
Check the temperature limit on the product page; our N50, N52 and N54 models have a 60°C limit. Instead of modifying a finished magnet, choose the correct size or ask about a custom-made product.
Can I drill a hole in a magnet?
Do not drill a finished neodymium magnet at home. The brittle material can crack or chip, and machining heat can impair its properties. Machining dust presents a fire hazard.
If you need a mounting hole, choose a ready-made magnet with a hole or countersink. Check the temperature limit of the specific model — our N50, N52 and N54 models have a 60°C limit.
If you need a mounting hole, choose a ready-made magnet with a hole or countersink. Check the temperature limit of the specific model — our N50, N52 and N54 models have a 60°C limit.
Safety and health
Hazards for people, children, and electronics.
Why are neodymium magnets dangerous?
These are not toys. The attraction force of large neodymiums is so huge that it can crush fingers, and even break hand bones if they get between two colliding magnets. The collision of magnets also causes sharp pieces of coating and material to chip off (like glass). Always use protective glasses and thick gloves when working with large magnets.
Do magnets harm pacemakers?
YES, THEY ARE DEADLY DANGEROUS.
Pacemakers and implantable cardioverter-defibrillators (ICD) have built-in magnetic switches (reed switches) used to switch them into service/test mode. Bringing a strong neodymium magnet close can:
1. Switch the pacemaker to constant (asynchronous) mode.
2. Disable therapy in the defibrillator (it won't work in case of a heart attack).
People with implants must maintain a safe distance, usually a minimum of 30-50 cm from magnets.
Pacemakers and implantable cardioverter-defibrillators (ICD) have built-in magnetic switches (reed switches) used to switch them into service/test mode. Bringing a strong neodymium magnet close can:
1. Switch the pacemaker to constant (asynchronous) mode.
2. Disable therapy in the defibrillator (it won't work in case of a heart attack).
People with implants must maintain a safe distance, usually a minimum of 30-50 cm from magnets.
What to do if a child swallows a magnet?
If you suspect that a child has swallowed a magnet, take them to an emergency department immediately. Do not wait for symptoms or for the magnet to pass.
Magnets can attract through the intestinal walls and cause serious injury, particularly if several magnets or a magnet and a metal object have been swallowed. A doctor must decide on further care. Keep magnets, including NeoCube, out of the reach of children.
Source: Oxford University Hospitals NHS guidance.
Magnets can attract through the intestinal walls and cause serious injury, particularly if several magnets or a magnet and a metal object have been swallowed. A doctor must decide on further care. Keep magnets, including NeoCube, out of the reach of children.
Source: Oxford University Hospitals NHS guidance.
Will a magnet ruin my phone or laptop?
The myth about destroying electronics comes from the times of floppy disks and CRT monitors.
Modern electronics:
Modern electronics:
- Smartphones: They are relatively safe, but a strong field will disrupt the compass, magnetometer, and may affect optical image stabilization (OIS) in the camera. Usually, after removing the magnet, everything returns to normal.
- SSD drives / Memory cards / Pendrives: They are completely resistant to magnetic fields (electronic recording, not magnetic).
- HDD drives (platter): They have strong neodymium magnets inside, but applying a gigantic magnet from the outside can damage data or mechanics.
- Payment cards: The magnetic strip will be erased. The chip is safe.
Troubleshooting
Why doesn't the magnet work as it should?
Why does the magnet slide down even though it has a 100 kg lifting capacity?
This is the most common problem. The lifting capacity given in the specification (e.g., 100 kg) refers to the perpendicular breakaway force (pulling perfectly upwards).
When you hang a magnet on a wall (vertically), a shear force acts on it (gravity pulls down). The force needed to slide the magnet on metal is usually only 15-20% of its maximum lifting capacity. Additionally, neodymium magnets are coated with nickel, which is very smooth and slippery. To prevent the magnet from sliding, you must increase friction – use a magnet in a rubber housing or back it with thin rubber/insulating tape.
When you hang a magnet on a wall (vertically), a shear force acts on it (gravity pulls down). The force needed to slide the magnet on metal is usually only 15-20% of its maximum lifting capacity. Additionally, neodymium magnets are coated with nickel, which is very smooth and slippery. To prevent the magnet from sliding, you must increase friction – use a magnet in a rubber housing or back it with thin rubber/insulating tape.
Why doesn't the magnet stick to stainless steel?
Not every steel is magnetic. It depends on its crystal structure.
- Austenitic steels (e.g., 304, 316): Are the most popular in gastronomy and balustrades. They are non-magnetic (or very weakly magnetic after processing). The magnet won't catch them.
- Ferritic (e.g., 430) and martensitic steels: Are magnetic and attract magnets, although usually weaker than regular black steel.
Do fridge magnets increase electricity consumption?
It is a myth. The static magnetic field from souvenir magnets has absolutely no effect on power consumption, the door's thermal insulation, or the efficiency of the cooling compressor. You can safely collect memories on your fridge without worrying about the bills.
Do magnets damage (scratch) the fridge?
The magnet itself doesn't damage the fridge, but its sliding surface might. Cheap ceramic magnets have a rough bottom that acts like sandpaper on glossy/stainless steel finishes. Solution: Stick a piece of felt, electrical tape, or foil on the back of every new magnet to create a soft spacer between the magnet and the door.
Why did the magnet break upon impact? (Brittleness)
This is the most common surprise for new users. A neodymium magnet, although it looks like metal, is physically a sintered ceramic (like a coffee mug). It is very hard but extremely brittle. If two strong magnets collide from a large distance, the impact energy is so high that the material cannot withstand it and cracks or chips. This is not a manufacturing defect, but a characteristic of the material. Magnets must be handled gently.
Quick fix: Magnet rusting or handle unscrewing?
If your gear needs service, apply these proven solutions:
| Problem | Step-by-step solution |
|---|---|
| Magnet is rusting (Damaged Ni-Cu-Ni coating) |
|
| Eyelet unscrews (Vibrations during throws) | This is natural. Always use thread locker glue (e.g., Loctite 'blue' - medium) before screwing the bolt/eyelet into the handle. Tighten firmly with a wrench or screwdriver. |
Storage and maintenance
How to care for magnets so they serve for years?
How to store strong magnets?
Always store magnets with spacers (plastic or wooden) between them. If two large magnets stick directly together, separating them may be impossible without specialized tools. Keep them away from moisture.
At what distance from electronics should magnets be kept?
For small magnets, 10-20 cm is enough. For powerful handles (F300, F550), we recommend a minimum of 50 cm distance from laptops, hard drives, payment cards, and mechanical watches.
Codes, customs, and law
Commercial and legal data.
Do magnets meet RoHS and REACH standards? (Certificates)
Yes. We care about safety and the environment. The neodymium magnets we offer comply with strict EU directives:
- RoHS (Restriction of Hazardous Substances): Magnets do not contain dangerous concentrations of lead, mercury, cadmium, or hexavalent chromium. They are safe for electronics.
- REACH: Products are chemically safe to use and do not release toxins during normal operation.
Do you sell magnets for dual-use applications?
No. Neodymium magnets and rare earth metals are subject to Chinese export controls, and we follow the Chinese licensing guidelines and procedures. We do not fulfil orders intended for dual-use applications.
This applies to public tenders as well: we supply universities, research institutes and public institutions, but for civilian applications only. For industrial and institutional orders we ask you to state the intended use of the product.
This applies to public tenders as well: we supply universities, research institutes and public institutions, but for civilian applications only. For industrial and institutional orders we ask you to state the intended use of the product.
What is the customs tariff code (CN / HS Code)?
The code for permanent metal magnets is 8505 11 00.
What is the PKWiU code?
The code is 26.80.99.0 (Other magnetic and optical media; other magnetic devices).
What is the VAT rate on magnets?
In Poland, the standard VAT rate of 23% applies.
Where to throw away an old magnet?
Neodymium magnets contain rare earth metals. Do not throw them into mixed waste. It is best to take them to a PSZOK (Selective Collection Point for Municipal Waste) or a scrapyard.
Separators and B2B
Magnetic separators (industry)
Cleaning loose and liquid products in production.
What is a magnetic separator used for?
A separator serves to catch unwanted metal (ferrous) elements from the transported raw material. They are used in the food industry (flour, sugar, grain), plastics (granulates), recycling, and mining. They protect crushing machines from failure and ensure the purity of the final product (HACCP systems).
How to clean a magnetic separator?
It depends on the type. Simple separators (e.g., rods, grates) are cleaned manually – by removing them from the product stream and wiping with a cloth or compressed air. Automatic and semi-automatic separators have impurity discharge systems (e.g., sliding cleaning sleeves), which allows for continuous operation without stopping the production line.
How many Gauss should a food separator have?
The standard in the food industry for catching fine filings is min. 6000-8000 Gauss on the rod surface. For very demanding applications (e.g., powdered milk, spices), neodymium separators with a power of 10,000 - 12,000 Gauss are used, which catch even paramagnetic dust (e.g., abraded stainless steel after processing).
Which company to choose for magnetic separators for the food industry?
Choosing a separator for a food-processing line requires the product, flow rate, temperature, contaminant type and cleaning method to be defined. Dhit manufactures magnetic separators; the solution must suit the particular installation.
Include material and documentation requirements in your enquiry. Documents and specifications must be confirmed for the particular design rather than assuming universal compliance for every separator. Read the separator selection guide.
Include material and documentation requirements in your enquiry. Documents and specifications must be confirmed for the particular design rather than assuming universal compliance for every separator. Read the separator selection guide.
Custom manufacturing and services
Unusual magnets and solutions for companies.
Do you make custom magnets?
Yes. As a direct importer and distributor cooperating with factories, we can supply magnets of any shape (arc, trapezoidal), dimension, and magnetization direction. The minimum order quantity (MOQ) depends on the size of the magnet and the degree of complexity (usually from several dozen to several hundred pieces). The lead time is approx. 6-10 weeks.
How long does a made-to-order magnet take?
Around 60 days. We count from order to delivery at your address (door-to-door): factory production, quality control and transport. Catalogue magnets ship from our warehouse in Poland – there you wait one working day, not two months.
What is the minimum order quantity (MOQ) for custom magnets?
Usually from 500 pieces, and the threshold depends on magnet size. We do take on smaller batches, but the unit price goes up.
Do you make samples before a production run?
Yes. The minimum sample quantity is 500 pieces – the same as the MOQ for custom production.
Can you magnetize my old magnet?
Unfortunately, we do not provide services for regenerating old magnets. Magnetization requires dedicated coils (magnetizers) perfectly matched to the shape of a specific magnet. It is often cheaper and faster to buy a new, stronger neodymium magnet of similar dimensions.
Do you issue a magnetic field measurement certificate?
Yes, for companies and industry, we offer a magnetic field measurement service (e.g., of separators) with a certified gauss meter. We issue a measurement protocol necessary for HACCP / ISO audits.
Knowledge and applications
Water and fuel magnetizers (Turbomag)
Turbomag water and fuel magnetizers — applications and mounting
How does a neodymium water magnetizer work?
The XT-4 is a clamp-on product mounted on a water pipe. It is not a filter and does not remove calcium or magnesium ions. Any effect on scale depends on the specific installation; no result is guaranteed without measurements.
Where to install the magnetizer (e.g., XT-4)?
Choose the XT-4 mounting position according to the pipe diameter, system layout and the instructions for the selected model. Check access to the pipe, fastening method and clearance from devices sensitive to magnetic fields.
Do fuel magnetizers (XT-5, XT-6) really work?
XT-5 and XT-6 are magnetizers offered for selected vehicle applications. A specific percentage of fuel savings or emissions change cannot be promised for every engine. Check model compatibility and mounting instructions before ordering.
NeoCube and technical education
NeoCube balls, physics experiments, and learning.
What is NeoCube and why is it so popular?
NeoCube is a set of strong neodymium spheres for building three-dimensional shapes. Check the selected set for the number of pieces and their diameter.
This is not a toy. It is for adults only and must be kept out of the reach of children. Swallowing magnets is life-threatening.
This is not a toy. It is for adults only and must be kept out of the reach of children. Swallowing magnets is life-threatening.
What experiments can be done with magnets?
Neodymium magnets are a great teaching aid. You can build: 1. Homopolar motor (battery, magnet, wire). 2. Magnetic train (battery, two magnets, and copper wire coil). 3. Show the phenomenon of eddy currents by dropping a magnet inside a copper pipe (it will fall very slowly). You will find all accessories in our education section.
Do magnetic balls wear off?
NeoCube balls are coated with a layer of nickel, gold, or black chrome. During intense play, the balls rub against each other, which after a longer time (several months/years) may lead to the coating wearing off at the contact points. This is natural mechanical wear.
Automotive and workshop (PDR, Taxi)
Magnets in the car, body repairs, and organization.
How to mount a taxi light or advertisement on the roof?
For this purpose, rubber-coated magnetic holders (with external or internal thread) are used. The rubber protects the paint from scratching and increases friction, preventing sliding at high speeds. We recommend using several holders with a diameter of min. 66mm or 88mm for secure mounting.
Which magnets are used in PDR (dent removal)?
In the PDR (Paintless Dent Repair) method, very strong neodymium magnets (often in the shape of a sphere or cylinder) are used to locate the lance tip under the sheet metal and to pull out shallow dents using the induction method. These magnets must be protected with material (e.g., felt) so as not to damage the paint.
Does a magnet on the oil drain plug help?
Yes. A magnetic plug catches iron filings from the gearbox or oil pan that settle to the bottom. This is especially important during the engine break-in period and in older cars where the wear of metal parts is greater. It is cheap protection against failure.
How to mount a license plate with magnets (frameless)?
This is a popular mod in tuning. You need a set of neodymium magnets (usually 4 pieces per plate) glued to the inside of the bumper and on the plate. Important: Magnets must be protected with soft tape or rubber so as not to scratch the paint, and their strength must be selected so that the plate does not fall off at 140 km/h, but can be removed by hand. We recommend plate magnets MPL 40x18x10mm - 2 pcs under the bumper, and MPL 40x20x5mm under the plate.
Construction and renovation
Locating profiles, inspection flaps, and cleaning.
How to find a profile under drywall (GK)?
You don't need an expensive detector. A strong neodymium magnet (e.g., cylinder 20x10mm) is enough. Move it slowly over the wall. The magnet will 'stick' in the place where steel screws fastening the board to the frame are located. This is the cheapest and most reliable way to avoid drilling into the profile.
How to make an invisible inspection flap (under tiles)?
Use a set: 4 plate magnets glued to the opening frame and 4 steel plates glued to the tile/flap. Thanks to this, the flap holds flush with the glaze, and in the event of a plumbing failure, it can be easily removed, e.g., using a glass suction cup.
How to clean up nails after roof renovation?
You can do this fastest with a magnetic sweeper (trawl). It is a device on wheels with a wide magnetic beam at the bottom. You drive over the grass or sand, and the magnet pulls out all nails, screws, and filings, protecting your car tires and household members' feet.
How to mount a magnet in tiles (inspection hatch)?
To make an inspection hatch for a bathtub or chimney: 1. Drilling: Use a diamond hole saw to cut a hole in the tile. 2. Gluing: Glue the magnet flush with the wall surface (using mounting adhesive), and glue a steel plate to the masking tile. Remember, the magnet must be embedded in the glue and not protrude, so the tile sits perfectly flat.
Advertising and printing
Mounting banners, magnetic foils, and gadgets.
What is the difference between magnetic foil and a neodymium magnet?
Magnetic foil is flexible (can be cut with scissors), but it is very weak. It is used for making fridge magnets (promotional items) or car stickers. It is not suitable for hanging heavy objects. For mounting banners or advertising boards, you must use hard neodymium magnets.
How to hang a banner without drilling the facade?
If the substrate is steel (e.g., a warehouse hall made of sandwich panels, a container), use magnetic hooks. They are mobile – you can change the position of the advertisement at any time without leaving holes. Remember to select the lifting capacity with a margin for wind gusts.
Which magnets for closing decorative boxes?
In printing (folders, premium boxes), thin plate magnets (e.g., 10x10x1mm or round 10x1mm) hidden under a layer of paper are used. Precise pairing of poles is important so that the box closes with a pleasant 'click'.
Modeling and hobbies (figures, RC)
Magnets in wargaming, flying models, and mock-ups.
Which magnets for figure bases (Warhammer)?
The standard is small cylindrical magnets with dimensions 3x2mm or 5x2mm (depending on the base size). They are glued into the bottom of the base, which allows for safe transport of the army in metal cases (figures do not bang against each other).
How to mount an RC car body with magnets?
Instead of ugly clips, modelers use 'invisible mounts'. You need 4 pairs of strong ring or plate magnets. You glue one part to the chassis posts, the other to the inside of the body. The body holds firmly, and no holes are visible from the outside.
How to make detachable model parts?
Neodymium magnets work great for mounting interchangeable weaponry in tank/plane models or removable roofs in dollhouses. Use drill bits with the diameter of the magnet to hide it flush with the surface.
Tailoring and fashion
Magnetic clasps, handbags, and clothing.
Are there magnets that can be sewn into fabric?
Yes, we offer special magnets in PVC covers for sewing in. The plastic casing allows machine sewing around the magnet while protecting it from moisture (washing). They are ideal for invisible clasps in coats or jackets.
How to repair a handbag clasp?
The most commonly used are so-called magnetic snaps. They consist of 4 elements (two plates, two magnets with 'prongs'). Installation does not require sewing – just cut the material, insert the prongs, and bend them with pliers. It is a quick and durable repair.
Can magnets be washed in a washing machine?
Regular neodymium magnets – no. Water and detergents will destroy the nickel coating, and the magnet will rust and stain clothing. For clothing, use only waterproof magnets (in PVC foil) or special snaps made of brass/stainless steel.
Office and organization
Boards, cable organization, and magnetic paints.
Why do magnets fall off a wall painted with magnetic paint?
Magnetic paint contains iron filings, but their layer is very thin. Regular school magnets are too weak. For magnetic walls, you must use light but strong neodymium magnets with a large contact area. Avoid heavy ceramic magnets that slide down under their own weight.
How to organize cables on a desk with magnets?
You can glue small magnets to cable plugs (using heat shrink or tape), and mount a metal strip on the edge of the desk. This keeps cables from falling behind the desk, and they are always at hand. This is a popular 'lifehack'.
Do you have pins for glass boards?
Yes. Glass boards require special, very strong magnets in a housing (often in the shape of a pawn or cylinder). Regular office magnets will not penetrate through thick glass. Look for products marked as 'for glass boards' in our offer.
Electronics and sensors
Reed switches, Hall effect, and DIY projects.
Which magnet for a Hall sensor?
Hall sensors detect magnetic fields. A small neodymium magnet (e.g., 3x3mm) is usually enough to trigger them. They are used in speed measurement, electric bike throttles, or as limit switches in 3D printers. Proper pole alignment relative to the sensor is important.
Do you repair speakers (magnet replacement)?
We do not provide service, but we sell ring magnets, which are the heart of every speaker. Replacing a ferrite magnet with a neodymium one in a speaker allows for drastically reducing its weight and increasing efficiency, but requires precise coil centering.
What is a reed switch and what magnet activates it?
A reed switch is a glass tube with contacts that close when a magnet is brought close. It is the simplest door/window opening sensor (alarm systems). A flat neodymium magnet glued to the window sash is enough for correct operation. It is a cheap and failure-free solution.
Curiosities
Curiosities with neodymium magnets.
Are 'magnesium' and 'magnet' the same thing? (Common mistake)
No. Magnesium (Mg) is a chemical element, a light metal, and a dietary supplement. A magnet is a physical object creating a magnetic field. Confusing these terms is a common linguistic error. In our store, you can buy neodymium magnets (for attracting), not magnesium (for drinking).
Who invented the neodymium magnet?
They were invented in 1984, independently by General Motors (USA) and Sumitomo (Japan), as a response to expensive samarium-cobalt magnets.
What is the strongest magnet?
Neodymium magnets are strong permanent magnets. However, the best product cannot be identified by material grade alone: pull force also depends on dimensions, shape and contact conditions.
Compare pull force and operating temperature on the specific product pages. N52 is not a universal solution to every mounting problem.
Compare pull force and operating temperature on the specific product pages. N52 is not a universal solution to every mounting problem.
Does a magnet with one pole exist (Monopole)?
In classical physics, no. Every magnet must have two poles: North (N) and South (S). Cutting a magnet in half creates two smaller magnets, each of which still has two poles.
Are magnets from an old hard drive good?
Yes, old HDD drives contain very strong, arc-shaped neodymium magnets. They are a great free source of magnets for DIY enthusiasts. Downside: They are glued to metal backing plates, from which it is very difficult to detach them without damaging (cracking) the magnet. Additionally, they have an irregular shape, which makes them hard to use in precise projects.
Myths: free energy and perpetual motion
Facts and myths about magnetic motors.
Is it possible to build a magnetic motor (free energy)?
Many videos on the internet show 'free energy' from magnets. From the point of view of physics, this is not possible (conservation of energy principle). A magnet is not a battery – it is a source of a field, not energy. However, building prototypes and experimenting with Halbach arrays is a fascinating hobby, for which we supply top-quality magnets and bearings.
Do magnets heal (magnetotherapy)?
Magnetic fields are used in physiotherapy for tissue regeneration and pain relief. However, one should distinguish certified medical devices from home remedies. We sell magnets as technical elements, not medical devices, although many customers use them for magnetotherapy on their own responsibility.
Practical Tips and Usage
How to safely separate magnets, where to search, and how to care for your gear.
How to safely separate strong neodymium magnets?
Separating two stuck neodymium magnets requires using sliding force (shearing), not pulling them apart perpendicularly. It is best to slide one magnet off the other using the edge of a table (place one on the table, push the other down). Remember to wear protective gloves, as strong magnets can painfully pinch your fingers.
Do neodymium magnets lose their power in water?
High-quality search magnets (like our Gold series) are protected by a multi-layer Ni-Cu-Ni anti-corrosion coating. Neodymium itself does not lose power when wet. Our mounts are designed for years of operation in difficult, wet river conditions.
Which magnet should I choose for river or lake fishing?
Choose the holder for your technique, set weight and conditions of contact with metal. All our F-series holders have magnets on both sides.
For a first purchase, compare F200 GOLD with the new F300 GOLD. F550 Silver Black uses an asymmetric 10 mm and 5 mm arrangement: this does not mean it works on only one side. See holder selection and the measurement method.
For a first purchase, compare F200 GOLD with the new F300 GOLD. F550 Silver Black uses an asymmetric 10 mm and 5 mm arrangement: this does not mean it works on only one side. See holder selection and the measurement method.
What is the difference between a neodymium and a ferrite magnet?
The primary difference is strength. A neodymium magnet is about 10 times stronger than a traditional ferrite (black) magnet of the same dimensions. This makes it ideal for building compact yet very strong mounts for retrieving objects from water.
View illustrations of magnet applications
Didn't find the answer to your question?
Our experts will be happy to help choose the right magnet.
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