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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

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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. It enables effective segregation of materials in the yard and accepting goods. 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. If the magnet does not attract the tested element, it is probably non-ferrous metal or acid-resistant steel.
Neodymium separators are much lighter and many times stronger than traditional ferrite ones. Strong neodymium field detects even weakly magnetic alloys and contaminants. 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. The tool is durable, drop-resistant, and prepared for hard work.
It is a simple and reliable construction without moving parts, so cleaning consists of removing scrap. 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 neodymium magnets.

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

  • They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to magnetic field loss due to opposing magnetic fields,
  • A magnet with a smooth silver surface is more attractive,
  • Neodymium magnets create maximum magnetic induction on a their surface, which increases force concentration,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • Thanks to flexibility in shaping and the capacity to adapt to unusual requirements,
  • Wide application in modern technologies – they are commonly used in computer drives, drive modules, medical devices, and multitasking production systems.
  • Thanks to their power density, small magnets offer high operating force, with minimal size,

Problematic aspects of neodymium magnets: tips and applications.

  • To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
  • We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
  • Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in creating threads and complex shapes in magnets, we propose using cover - magnetic mount.
  • Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
  • Due to expensive raw materials, their price is higher than average,

Maximum magnetic pulling forcewhat affects it?

The lifting capacity listed is a result of laboratory testing conducted under specific, ideal conditions:

  • using a plate made of mild steel, serving as a magnetic yoke
  • with a thickness of at least 10 mm
  • with an ground touching surface
  • without the slightest insulating layer between the magnet and steel
  • during pulling in a direction vertical to the mounting surface
  • at room temperature

Determinants of lifting force in real conditions

Effective lifting capacity is affected by specific conditions, including (from priority):

  • Distance (between the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
  • Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
  • Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of generating force.
  • Material composition – not every steel reacts the same. Alloy additives worsen the attraction effect.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Uneven metal weaken the grip.
  • Thermal conditions – NdFeB sinters have a sensitivity to temperature. At higher temperatures they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was assessed using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the holding force.

Safety rules for work with neodymium magnets

Protect data

Intense magnetic fields can destroy records on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.

Beware of splinters

NdFeB magnets are sintered ceramics, which means they are very brittle. Clashing of two magnets leads to them shattering into shards.

Dust is flammable

Mechanical processing of NdFeB material poses a fire hazard. Neodymium dust reacts violently with oxygen and is difficult to extinguish.

Keep away from electronics

Navigation devices and mobile phones are extremely sensitive to magnetic fields. Close proximity with a strong magnet can ruin the sensors in your phone.

Warning for allergy sufferers

It is widely known that the nickel plating (the usual finish) is a strong allergen. If you have an allergy, refrain from touching magnets with bare hands or select encased magnets.

Immense force

Handle magnets with awareness. Their huge power can shock even professionals. Plan your moves and respect their power.

Life threat

Patients with a pacemaker should maintain an large gap from magnets. The magnetism can stop the functioning of the implant.

Bodily injuries

Mind your fingers. Two large magnets will join instantly with a force of several hundred kilograms, destroying anything in their path. Be careful!

Choking Hazard

Only for adults. Small elements can be swallowed, causing intestinal necrosis. Keep out of reach of children and animals.

Do not overheat magnets

Avoid heat. NdFeB magnets are sensitive to temperature. If you need operation above 80°C, ask us about special high-temperature series (H, SH, UH).

Attention!

Want to know more? Check our post: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98