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neodymium magnets

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SMZR 25x150 / N52 - magnetic separator with handle

magnetic separator with handle

Catalog no 140234

GTIN: 5906301813422

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

150 mm

Weight

0.01 g

430.50 with VAT / pcs + price for transport

350.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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Lifting power and structure of a neodymium magnet can be analyzed on our online calculation tool.

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SMZR 25x150 / N52 - magnetic separator with handle
Specification/characteristics SMZR 25x150 / N52 - magnetic separator with handle
properties
values
Cat. no.
140234
GTIN
5906301813422
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
150 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.
The magnet "catches" iron but remains completely indifferent to aluminum, copper, brass, and zinc. 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. Strong neodymium field detects even weakly magnetic alloys and contaminants. The neodymium version is currently the standard in professional scrap yards.
The construction consists of a hermetic can protecting the magnet and an ergonomic handle. The grip was designed so as not to slip in the hand, even in a work glove. 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). We also offer versions where pulling the handle automatically drops collected material. The sliding technique is more effective and requires less force than perpendicular tearing.

Advantages as well as disadvantages of NdFeB magnets.

Besides their immense field intensity, neodymium magnets offer the following advantages:

  • Their magnetic field remains stable, and after approximately ten years it drops only by ~1% (according to research),
  • Magnets effectively protect themselves against demagnetization caused by external fields,
  • Thanks to the shimmering finish, the coating of nickel, gold, or silver gives an clean appearance,
  • Neodymium magnets achieve maximum magnetic induction on a contact point, which increases force concentration,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
  • Possibility of individual forming as well as modifying to specific needs,
  • Key role in high-tech industry – they find application in computer drives, brushless drives, advanced medical instruments, as well as complex engineering applications.
  • Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which allows their use in miniature devices

Disadvantages of neodymium magnets:

  • Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also increases their durability
  • Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
  • Due to limitations in realizing threads and complex shapes in magnets, we recommend using cover - magnetic mechanism.
  • Possible danger resulting from small fragments of magnets are risky, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical in case of swallowing.
  • With budget limitations the cost of neodymium magnets is economically unviable,

Maximum lifting capacity of the magnetwhat it depends on?

The force parameter is a measurement result performed under specific, ideal conditions:

  • using a sheet made of mild steel, acting as a magnetic yoke
  • whose thickness is min. 10 mm
  • with a surface cleaned and smooth
  • under conditions of ideal adhesion (metal-to-metal)
  • for force applied at a right angle (in the magnet axis)
  • at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

In practice, the real power depends on many variables, listed from crucial:

  • Gap (between the magnet and the metal), because even a tiny clearance (e.g. 0.5 mm) can cause a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
  • Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
  • Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
  • Thermal conditions – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was carried out on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.

H&S for magnets

Demagnetization risk

Regular neodymium magnets (grade N) lose power when the temperature surpasses 80°C. This process is irreversible.

Cards and drives

Avoid bringing magnets close to a wallet, computer, or TV. The magnetism can permanently damage these devices and wipe information from cards.

Powerful field

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

This is not a toy

Neodymium magnets are not intended for children. Swallowing a few magnets can lead to them attracting across intestines, which poses a direct threat to life and necessitates immediate surgery.

Physical harm

Large magnets can crush fingers instantly. Under no circumstances put your hand between two strong magnets.

Magnet fragility

Protect your eyes. Magnets can fracture upon uncontrolled impact, ejecting shards into the air. Wear goggles.

Medical implants

Patients with a pacemaker should maintain an safe separation from magnets. The magnetism can disrupt the functioning of the life-saving device.

Impact on smartphones

Remember: rare earth magnets produce a field that interferes with precision electronics. Maintain a separation from your phone, device, and navigation systems.

Avoid contact if allergic

Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, cease working with magnets and use protective gear.

Dust is flammable

Fire hazard: Rare earth powder is highly flammable. Avoid machining magnets without safety gear as this may cause fire.

Important!

Looking for details? Check our post: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98