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neodymium magnets

We offer yellow color magnetic Nd2Fe14B - our offer. All magnesy in our store are in stock for immediate purchase (see the list). Check out the magnet price list for more details see the magnet price list

Magnets for water searching F300 GOLD

Where to buy strong neodymium magnet? Holders with magnets in airtight and durable steel casing are perfect for use in variable and difficult weather conditions, including in the rain and snow check...

magnets with holders

Holders with magnets can be used to facilitate manufacturing, underwater discoveries, or locating space rocks made of metal more...

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SM 25x150 [2xM8] / N52 - magnetic roller

magnetic separator

catalog number 130368


diameter Ø

25 mm [±0,1 mm]


150 mm [±0,1 mm]

max. temperature

≤ 80 °C

467.40 PLN gross price (including VAT) / pcs +

380.00 PLN net price + 23% VAT / pcs

bulk discounts:

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price from 1 pcs
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Give us a call tel: +48 888 99 98 98 or write through contact form on our website. You can check the mass as well as the shape of neodymium magnets in our force calculator power calculator

Orders placed by 2:00 PM will be shipped on the same business day.

Specification: magnetic separator 25x150 [2xM8] / N52

Characteristics: magnetic separator 25x150 [2xM8] / N52
catalog number
production / distribution
Dhit sp. z o.o.
country of origin
Poland / China / Germany
customs code
diameter Ø
25 mm [±0,1 mm]
150 mm [±0,1 mm]
max. temperature ?
≤ 80 °C
0.01 g
execution tolerance
± 0.1 mm
rodzaj materiału
AISI 304 - bezpieczna dla żywności
rodzaj magnesów
NdFeB N52
ilość gwintów
2x [M8] wewnętrzne
obwodowa - 5 nabiegunników
indukcja magnetyczna
~ 9 500 Gauss [±5%]
max. temp. pracy
poniżej ≤ 80°C
grubość rury osłonowej
1 mm

Magnetic properties of the material N52

material characteristics N52
remenance Br [Min. - Max.] ?
remenance Br [Min. - Max.] ?
coercivity bHc ?
coercivity bHc ?
actual internal force iHc
≥ 12
actual internal force iHc
≥ 955
energy density [Min. - Max.]
BH max MGOe
energy density [Min. - Max.]
BH max KJ/m
max. temperature
≤ 80

Physical properties of sintered neodymium magnets Nd2Fe14B

Physical properties of sintered neodymium magnets Nd2Fe14B
Vickers hardness
Curie Temperature TC
312 - 380
Curie Temperature TF
593 - 716
Specific resistance
Bending strength
Compressive strength
Thermal expansion parallel (∥) to orientation (M)
(3-4) x 106
Thermal expansion perpendicular (⊥) to orientation (M)
-(1-3) x 10-6
Young's modulus
1.7 x 104
The magnetic separator, namely the magnetic roller, uses the power of neodymium magnets, placed in a casing made of stainless steel usually AISI304. As a result, it is possible to effectively segregate ferromagnetic elements from other materials. A key aspect of its operation is the repulsion of N and S poles of neodymium magnets, which enables magnetic substances to be collected. The thickness of the magnet and its structure pitch determine the power and range of the separator's operation.
Generally speaking, magnetic separators serve to extract ferromagnetic elements. If the cans are made from ferromagnetic materials, the separator will effectively segregate them. However, if the cans are made of non-ferromagnetic materials, such as aluminum, the separator will not effectively segregate them.
Yes, magnetic rollers find application in the food industry for the elimination of metallic contaminants, for example iron fragments or iron dust. Our rods are constructed from durable acid-resistant steel, AISI 304, intended for use in food.
Magnetic rollers, otherwise cylindrical magnets, are employed in metal separation, food production as well as recycling. They help in removing iron dust during the process of separating metals from other wastes.
Our magnetic rollers consist of neodymium magnets anchored in a stainless steel tube cylinder made of stainless steel with a wall thickness of 1mm.
Both ends of the magnetic bar can be with M8 threaded openings, which enables easy installation in machines or magnetic filter drawers. A "blind" version is also possible in manual separators.
In terms of forces, magnetic bars differ in terms of flux density, magnetic force lines and the field of the magnetic field. We produce them in two materials, N42 and N52.
Often it is believed that the stronger the magnet, the more efficient it is. Nevertheless, the strength of the magnet's power is based on the height of the used magnet and the quality of the material [N42] or [N52], as well as on the area of application and specific needs. The standard operating temperature of a magnetic bar is 80°C.
When the magnet is more flat, the magnetic force lines will be short. On the other hand, in the case of a thicker magnet, the force lines will be extended and reach further.
For creating the casings of magnetic separators - rollers, most often stainless steel is utilized, particularly types AISI 316, AISI 316L, and AISI 304.
In a saltwater contact, AISI 316 steel exhibits the best resistance due to its outstanding corrosion resistance.
Magnetic rollers stand out for their unique configuration of poles and their capability to attract magnetic substances directly onto their surface, as opposed to other devices that often use complex filtration systems.
Technical designations and terms pertaining to magnetic separators include amongst others magnet pitch, polarity, and magnetic induction, as well as the steel type applied.
Magnetic induction for a roller is measured using a teslameter or a gaussmeter with a flat Hall-effect probe, seeking the highest magnetic field value close to the magnetic pole. The result is verified in a value table - the lowest is N30. All designations less than N27 or N25 indicate recycling that falls below the standard - they are not suitable.
Neodymium magnetic rollers offer a range of benefits such as a very strong magnetic field, the ability to capture even the tiniest metal particles, and durability. Disadvantages may include the requirement for frequent cleaning, greater weight, and potential installation difficulties.
For proper maintenance of neodymium magnetic rollers, it is suggested {to clean them regularly from contaminants, avoid extremal temperatures up to 80°C, and washing after each use, avoiding temperatures up to 80°C. The rollers have an IP67 waterproof rating, so if they are not sealed, the magnets inside may rust and lose their strength. Magnetic field measurements are suggested to be conducted once every 24 months. Caution should be exercised during use as there is a risk of finger injury. If the protective tube is only 0.5 mm thick, it can be worn down, which, in turn, can result in issues with the magnetic rod becoming unsealed and product contamination. The Roller operating range equals its diameter, fi25mm is approximately 25mm active range, while fi32 is about 40mm.

Shopping tips

Advantages and disadvantages of neodymium magnets NdFeB.

In addition to immense power, neodymium magnets have the following advantages:

  • They do not lose power over time - after 10 years, their strength decreases by only ~1% (theoretically),
  • They are exceptionally resistant to demagnetization caused by an external magnetic field,
  • By applying a shiny coating of nickel, gold, or silver, the element gains an aesthetic appearance,
  • They have very high magnetic induction on the surface of the magnet,
  • By using an appropriate combination of materials, they can achieve high thermal resistance, allowing them to operate at temperatures up to 230°C and above...
  • Thanks to the flexibility in shaping and the ability to adapt to specific requirements – neodymium magnets can be produced in a wide range of shapes and sizes, which amplifies their universality in usage.
  • Significant importance in modern technologies – find application in computer drives, electric drive mechanisms, medical equipment or very modern machines.

Disadvantages of neodymium magnets:

  • They are prone to breaking as they are fragile when subjected to a powerful impact. If the magnets are exposed to impacts, it is suggested using magnets in a metal holder. The steel housing in the form of a holder protects the magnet from impacts and also increases its overall strength,
  • They lose strength at high temperatures. Most neodymium magnets experience permanent loss of strength when heated above 80°C (depending on the form and height). However, we also offer special magnets with high temperature resistance, up to 230°C,
  • They rust in a humid environment. For outdoor use, we recommend using waterproof magnets, such as those made of rubber or plastic,
  • Limited ability to create threads or complex shapes in the magnet - the use of a housing is recommended - magnetic holder
  • Potential hazard associated with microscopic parts of magnets pose a threat, in case of ingestion, which is crucial in the aspect of protecting young children. Additionally, small elements of these devices can complicate diagnosis after entering the body.

Exercise Caution with Neodymium Magnets

Under no circumstances should neodymium magnets be placed near a computer HDD, TV, and wallet.

Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.

Neodymium magnets are the strongest magnets ever invented. Their power can surprise you.

Read the information on our website on how to properly utilize neodymium magnets and avoid significant harm to your body and unintentional damage to the magnets.

Do not bring neodymium magnets close to GPS and smartphones.

Intense magnetic fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

Avoid contact with neodymium magnets if you have a nickel allergy.

Studies clearly indicate a small percentage of people who suffer from metal allergies such as nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Neodymium magnets can demagnetize at high temperatures.

Although magnets have demonstrated their effectiveness up to 80°C or 175°F, the temperature can vary depending on the type, shape, and intended use of the specific magnet.

Neodymium magnets should not be near people with pacemakers.

In the case of neodymium magnets, there is a strong magnetic field. As a result, it interferes with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.

 It is essential to maintain neodymium magnets away from youngest children.

Remember that neodymium magnets are not toys. Do not allow children to play with them. In the case of swallowing multiple magnets simultaneously, they can attract to each other through the intestinal walls. In the worst case scenario, this can lead to death.

Neodymium magnetic are incredibly delicate, they easily fall apart and can become damaged.

Neodymium magnets are highly fragile, and by joining them in an uncontrolled manner, they will crack. Neodymium magnets are made of metal and coated with a shiny nickel, but they are not as durable as steel. At the moment of collision between the magnets, sharp metal fragments can be dispersed in different directions.

Neodymium magnets can attract to each other, pinch the skin, and cause significant injuries.

Magnets may crack or alternatively crumble with uncontrolled connecting to each other. You can't move them to each other. At a distance less than 10 cm you should have them extremely strongly.

Dust and powder from neodymium magnets are flammable.

Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Please read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

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tel: +48 888 99 98 98