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neodymium magnets

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SMZR 25x200 / N52 - magnetic separator with handle

magnetic separator with handle

Catalog no 140444

GTIN: 5906301813507

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

200 mm

Weight

0.01 g

553.50 with VAT / pcs + price for transport

450.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Force along with appearance of neodymium magnets can be estimated with our magnetic calculator.

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SMZR 25x200 / N52 - magnetic separator with handle
Specification/characteristics SMZR 25x200 / N52 - magnetic separator with handle
properties
values
Cat. no.
140444
GTIN
5906301813507
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
200 mm [±0,1 mm]
Weight
0.01 g [±0,1 mm]
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N52

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

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

Shopping tips

It is an essential at every scrap yard, waste sorting plant, and workshop. Thanks to it, you can easily and quickly assess the value of scrap and avoid mistakes. It is also useful for pulling small steel elements from crates, ash, sand, or sawdust.
A neodymium magnet attracts only ferromagnetic metals, such as ordinary steel (black) and cast iron. Lack of reaction (attraction) means the tested item is made of non-magnetic material.
Neodymiums are more compact and effective during all-day work at a scrap yard. A lighter tool allows for longer work without wrist and arm pain. This is a modern solution displacing heavy and weak ferrite magnets.
The magnet is completely shielded from mechanical impacts, which extends its lifespan. Tool ergonomics are key with frequent use by employees. The tool is durable, drop-resistant, and prepared for hard work.
In this model, collected metal must be torn off manually (preferably in a work glove). If you are looking for automatic dropping, ask about models with a magnetic release system. The sliding technique is more effective and requires less force than perpendicular tearing.

Strengths and weaknesses of rare earth magnets.

Besides their immense strength, neodymium magnets offer the following advantages:

  • They do not lose magnetism, even over nearly 10 years – the drop in lifting capacity is only ~1% (according to tests),
  • Magnets very well protect themselves against loss of magnetization caused by foreign field sources,
  • Thanks to the shiny finish, the surface of nickel, gold-plated, or silver-plated gives an professional appearance,
  • Magnets are distinguished by maximum magnetic induction on the outer layer,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • In view of the potential of free molding and customization to custom needs, magnetic components can be produced in a variety of shapes and sizes, which increases their versatility,
  • Significant place in future technologies – they are utilized in magnetic memories, drive modules, medical devices, and complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

  • They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
  • Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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
  • When exposed to humidity, magnets start to rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • Due to limitations in creating nuts and complicated forms in magnets, we recommend using a housing - magnetic holder.
  • Possible danger resulting from small fragments of magnets are risky, in case of ingestion, which is particularly important in the context of child health protection. Additionally, small components of these magnets can be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price is relatively high,

Best holding force of the magnet in ideal parameterswhat contributes to it?

The declared magnet strength refers to the limit force, obtained under laboratory conditions, meaning:

  • on a base made of mild steel, optimally conducting the magnetic flux
  • with a cross-section minimum 10 mm
  • with a plane cleaned and smooth
  • under conditions of ideal adhesion (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • in neutral thermal conditions

Key elements affecting lifting force

In practice, the actual holding force results from many variables, presented from most significant:

  • Clearance – existence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
  • Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
  • Plate thickness – insufficiently thick steel does not close the flux, causing part of the flux to be lost into the air.
  • Steel grade – ideal substrate is pure iron steel. Cast iron may generate lower lifting capacity.
  • Surface quality – the smoother and more polished the surface, the better the adhesion and higher the lifting capacity. Unevenness creates an air distance.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet and the plate lowers the holding force.

Safety rules for work with NdFeB magnets

Protective goggles

Despite metallic appearance, neodymium is delicate and cannot withstand shocks. Avoid impacts, as the magnet may crumble into sharp, dangerous pieces.

Serious injuries

Mind your fingers. Two powerful magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Be careful!

Pacemakers

Medical warning: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Metal Allergy

Certain individuals suffer from a contact allergy to nickel, which is the standard coating for neodymium magnets. Extended handling might lead to a rash. We strongly advise use protective gloves.

Handling guide

Before starting, check safety instructions. Sudden snapping can destroy the magnet or hurt your hand. Be predictive.

No play value

Absolutely store magnets out of reach of children. Risk of swallowing is high, and the effects of magnets connecting inside the body are tragic.

Flammability

Powder created during machining of magnets is combustible. Avoid drilling into magnets without proper cooling and knowledge.

Phone sensors

Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.

Magnetic media

Intense magnetic fields can erase data on payment cards, hard drives, and other magnetic media. Stay away of at least 10 cm.

Permanent damage

Avoid heat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, inquire about special high-temperature series (H, SH, UH).

Caution!

More info about hazards in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98