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neodymium magnets

We offer yellow color magnetic Nd2Fe14B - our offer. All magnesy neodymowe on our website are in stock for immediate delivery (check the list). See the magnet price list for more details see the magnet price list

Magnet for searching F300 GOLD

Where to buy strong neodymium magnet? Holders with magnets in solid and airtight steel enclosure are ideally suited for use in challenging climate conditions, including during snow and rain more information

magnets with holders

Holders with magnets can be applied to improve production processes, underwater exploration, or searching for meteorites from gold check...

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SMZR 25x200 / N52 - magnetic separator with handle

magnetic separator with handle

Catalog no 140444

GTIN: 5906301813507

5.00

Diameter Ø

25 mm [±1 mm]

Height

200 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 9 500 Gauss [±5%]

553.50 with VAT / pcs + price for transport

450.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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487.08 ZŁ

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SMZR 25x200 / N52 - magnetic separator with handle

Specification / characteristics SMZR 25x200 / N52 - magnetic separator with handle

properties
properties values
Cat. no. 140444
GTIN 5906301813507
Production/Distribution Dhit sp. z o.o.
ul. Zielona 14 05-850 Ożarów Mazowiecki PL
Country of origin Poland / China / Germany
Customs code 85059029
Diameter Ø 25 mm [±1 mm]
Height 200 mm [±1 mm]
Weight 0.01 g
Material Type Stainless steel AISI 304 / A2
Magnetic Flux ~ 9 500 Gauss [±5%]
Size/Mount Quantity 2xM8
Polarity circumferential - 7 poles
Casing Tube Thickness 1 mm
Manufacturing Tolerance ±1 mm

Magnetic properties of material N52

Specification / characteristics SMZR 25x200 / N52 - magnetic separator with handle
properties values units
remenance Br [Min. - Max.] ? 14.2-14.7 kGs
remenance Br [Min. - Max.] ? 1420-1470 T
coercivity bHc ? 10.8-12.5 kOe
coercivity bHc ? 860-995 kA/m
actual internal force iHc ≥ 12 kOe
actual internal force iHc ≥ 955 kA/m
energy density [Min. - Max.] ? 48-53 BH max MGOe
energy density [Min. - Max.] ? 380-422 BH max KJ/m
max. temperature ? ≤ 80 °C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C

Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
properties values units
Vickers hardness ≥550 Hv
Density ≥7.4 g/cm3
Curie Temperature TC 312 - 380 °C
Curie Temperature TF 593 - 716 °F
Specific resistance 150 μΩ⋅Cm
Bending strength 250 Mpa
Compressive strength 1000~1100 Mpa
Thermal expansion parallel (∥) to orientation (M) (3-4) x 106 °C-1
Thermal expansion perpendicular (⊥) to orientation (M) -(1-3) x 10-6 °C-1
Young's modulus 1.7 x 104 kg/mm²

Check out more proposals

It is an essential at every scrap yard, waste sorting plant, and workshop. It allows checking if a given item is ferromagnetic (steel, cast iron) or not (aluminum, copper, stainless steel). It can be used to collect scattered nails and screws from hard-to-reach places.
A neodymium magnet attracts only ferromagnetic metals, such as ordinary steel (black) and cast iron. If the magnet does not attract the tested element, it is probably non-ferrous metal or acid-resistant steel.
Neodymiums are more compact and effective during all-day work at a scrap yard. Thanks to this, work is more comfortable, and detection faster and more certain. The neodymium version is currently the standard in professional scrap yards.
The magnet is completely shielded from mechanical impacts, which extends its lifespan. Tool ergonomics are key with frequent use by employees. Thanks to such an armored build, the separator is resistant to difficult conditions prevailing at a scrap yard.
Standard manual separators (such as SMZR 25x200 / N52) do not have a release mechanism and require manual cleaning. Models with a release lever (so-called grippers with a dropper) are also available in another category. The sliding technique is more effective and requires less force than perpendicular tearing.

Strengths as well as weaknesses of NdFeB magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

  • They do not lose power, even over approximately 10 years – the drop in power is only ~1% (according to tests),
  • Magnets effectively defend themselves against demagnetization caused by external fields,
  • By covering with a lustrous coating of gold, the element presents an elegant look,
  • Neodymium magnets create maximum magnetic induction on a contact point, which allows for strong attraction,
  • Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
  • Due to the ability of flexible molding and adaptation to custom projects, magnetic components can be modeled in a broad palette of geometric configurations, which increases their versatility,
  • Versatile presence in future technologies – they are commonly used in HDD drives, motor assemblies, medical devices, and technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

  • To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are very resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
  • Due to limitations in producing threads and complex shapes in magnets, we propose using a housing - magnetic mount.
  • Possible danger related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, tiny parts of these products can be problematic in diagnostics medical in case of swallowing.
  • With mass production the cost of neodymium magnets is a challenge,

Optimal lifting capacity of a neodymium magnetwhat affects it?

The force parameter is a theoretical maximum value executed under specific, ideal conditions:

  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section minimum 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • during pulling in a direction perpendicular to the plane
  • at temperature room level

Magnet lifting force in use – key factors

Please note that the application force may be lower influenced by the following factors, starting with the most relevant:

  • Clearance – existence of foreign body (rust, tape, air) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Direction of force – highest force is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
  • Steel thickness – too thin plate does not close the flux, causing part of the flux to be escaped into the air.
  • Steel grade – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
  • Base smoothness – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness creates an air distance.
  • Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets

Immense force

Be careful. Rare earth magnets attract from a distance and snap with massive power, often faster than you can react.

Precision electronics

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Electronic hazard

Data protection: Neodymium magnets can damage payment cards and sensitive devices (pacemakers, medical aids, mechanical watches).

Pinching danger

Protect your hands. Two powerful magnets will snap together instantly with a force of several hundred kilograms, crushing anything in their path. Be careful!

Swallowing risk

Absolutely store magnets away from children. Ingestion danger is high, and the consequences of magnets connecting inside the body are fatal.

Material brittleness

NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them breaking into small pieces.

Skin irritation risks

Some people suffer from a sensitization to nickel, which is the standard coating for NdFeB magnets. Prolonged contact might lead to skin redness. We strongly advise use safety gloves.

Danger to pacemakers

Life threat: Strong magnets can turn off pacemakers and defibrillators. Do not approach if you have medical devices.

Operating temperature

Standard neodymium magnets (N-type) lose power when the temperature exceeds 80°C. This process is irreversible.

Machining danger

Combustion risk: Neodymium dust is highly flammable. Do not process magnets without safety gear as this may cause fire.

Attention!

Need more info? Check our post: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98