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neodymium magnets

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SMZR 25x225 / N52 - magnetic separator with handle

magnetic separator with handle

Catalog no 140235

GTIN: 5906301813439

5

Diameter Ø

25 mm [±1 mm]

Height

225 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 9 500 Gauss [±5%]

615.00 with VAT / pcs + price for transport

500.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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615.00 ZŁ
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Strength as well as structure of magnetic components can be estimated using our online calculation tool.

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SMZR 25x225 / N52 - magnetic separator with handle
Specification/characteristics SMZR 25x225 / N52 - magnetic separator with handle
properties
values
Cat. no.
140235
GTIN
5906301813439
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±1 mm]
Height
225 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 - 8 poles
Casing Tube Thickness
1 mm
Manufacturing Tolerance
±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

A manual separator is a basic tool for quick identification and sorting of metals. 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 tool reacts to carbon steel but does not attract most stainless steels (austenitic, like AISI 304). This is the simplest and fastest test to distinguish valuable non-ferrous metals from cheap 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. This is a modern solution displacing heavy and weak ferrite magnets.
The neodymium magnet is enclosed in a solid, metal housing (steel or brass). A solid handle (wooden, rubber, or plastic) ensures a firm and comfortable grip. Thanks to such an armored build, the separator is resistant to difficult conditions prevailing at a scrap yard.
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. In the case of strong magnets, it is easiest to slide the metal to the side of the housing instead of tearing it straight off.

Pros as well as cons of neodymium magnets.

Apart from their strong magnetism, neodymium magnets have these key benefits:

  • Their magnetic field is durable, and after around ten years it drops only by ~1% (theoretically),
  • They possess excellent resistance to magnetism drop when exposed to opposing magnetic fields,
  • A magnet with a smooth nickel surface is more attractive,
  • Neodymium magnets achieve maximum magnetic induction on a small area, which ensures high operational effectiveness,
  • Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
  • Considering the possibility of precise forming and adaptation to custom requirements, neodymium magnets can be manufactured in a variety of forms and dimensions, which expands the range of possible applications,
  • Significant place in innovative solutions – they serve a role in magnetic memories, motor assemblies, diagnostic systems, and technologically advanced constructions.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: tips and applications.

  • To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of producing nuts in the magnet and complicated forms - preferred is a housing - mounting mechanism.
  • Potential hazard resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. Furthermore, small elements of these devices are able to be problematic in diagnostics medical after entering the body.
  • With mass production the cost of neodymium magnets is a challenge,

Magnetic strength at its maximum – what affects it?

Holding force of 0 kg is a theoretical maximum value conducted under standard conditions:

  • with the use of a yoke made of special test steel, ensuring full magnetic saturation
  • possessing a thickness of at least 10 mm to avoid saturation
  • with an polished touching surface
  • without any insulating layer between the magnet and steel
  • for force acting at a right angle (pull-off, not shear)
  • in stable room temperature

Key elements affecting lifting force

Holding efficiency is affected by specific conditions, mainly (from priority):

  • Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
  • Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
  • Metal thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of generating force.
  • Metal type – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
  • Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces weaken the grip.
  • Thermal environment – temperature increase results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.

Safety rules for work with neodymium magnets

Handling guide

Use magnets consciously. Their immense force can shock even experienced users. Stay alert and respect their power.

Adults only

Adult use only. Tiny parts can be swallowed, causing serious injuries. Keep away from children and animals.

Medical interference

Warning for patients: Powerful magnets disrupt electronics. Maintain at least 30 cm distance or ask another person to handle the magnets.

Dust is flammable

Combustion risk: Rare earth powder is highly flammable. Avoid machining magnets in home conditions as this risks ignition.

Bone fractures

Watch your fingers. Two large magnets will snap together instantly with a force of massive weight, destroying anything in their path. Exercise extreme caution!

Allergy Warning

Nickel alert: The Ni-Cu-Ni coating consists of nickel. If skin irritation occurs, cease handling magnets and wear gloves.

GPS Danger

Note: neodymium magnets generate a field that disrupts precision electronics. Keep a separation from your mobile, tablet, and navigation systems.

Safe distance

Data protection: Strong magnets can ruin data carriers and delicate electronics (heart implants, medical aids, mechanical watches).

Protective goggles

Protect your eyes. Magnets can explode upon uncontrolled impact, ejecting sharp fragments into the air. Wear goggles.

Demagnetization risk

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

Attention!

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