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neodymium magnets

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SM 25x125 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130367

GTIN: 5906301813156

0

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

125 mm

Weight

0.01 g

393.60 with VAT / pcs + price for transport

320.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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SM 25x125 [2xM8] / N52 - magnetic separator
Specification/characteristics SM 25x125 [2xM8] / N52 - magnetic separator
properties
values
Cat. no.
130367
GTIN
5906301813156
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
125 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

The magnetic rod is the basic building block of grate separators. It is installed in chutes and hoppers to protect production machinery. Thanks to the use of strong neodymium magnets, the rod catches even fine metal dust.
The rod consists of a casing tube made of acid-resistant steel (AISI 304/316). The core is a magnetic circuit generating high induction. Thanks to this, the rod is durable and hygienic.
Metal filings stick very firmly to the surface, so cleaning requires strength or a trick. You can use compressed air or special non-magnetic strippers. In industry, cover tubes (Easy Clean) are used, from which the magnet is slid out.
Magnetic induction measured in Gauss (Gs) determines the magnetic flux density on the rod surface. The economical version handles large metal pieces well. High Power versions (~12000-14000 Gs) are necessary to catch metal dust and stainless steel after processing.
We fulfill custom orders for bars matched to your machine. The rod end is adapted to the mounting system in your separator. Contact us for a quote on non-standard dimensions.

Advantages as well as disadvantages of NdFeB magnets.

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

  • They retain attractive force for around 10 years – the loss is just ~1% (in theory),
  • They do not lose their magnetic properties even under external field action,
  • By applying a shiny coating of gold, the element presents an elegant look,
  • Neodymium magnets deliver maximum magnetic induction on a their surface, which ensures high operational effectiveness,
  • Neodymium magnets are known for very high magnetic induction and the ability to work at temperatures up to 230°C or higher (depending on the shape),
  • Possibility of exact modeling and optimizing to complex conditions,
  • Key role in high-tech industry – they are commonly used in computer drives, electric motors, medical devices, as well as complex engineering applications.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Cons of neodymium magnets and proposals for their use:

  • At strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening 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 extremely resistant to heat
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • We recommend a housing - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex shapes.
  • Health risk to health – tiny shards of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that tiny parts of these magnets are able to be problematic in diagnostics medical when they are in the body.
  • With budget limitations the cost of neodymium magnets can be a barrier,

Maximum holding power of the magnet – what affects it?

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

  • on a block made of structural steel, perfectly concentrating the magnetic field
  • with a thickness no less than 10 mm
  • with a surface perfectly flat
  • without the slightest insulating layer between the magnet and steel
  • for force applied at a right angle (in the magnet axis)
  • at standard ambient temperature

Practical lifting capacity: influencing factors

In practice, the real power is determined by several key aspects, ranked from the most important:

  • Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of maximum force).
  • Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
  • Metal type – different alloys attracts identically. Alloy additives worsen the interaction with the magnet.
  • Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
  • Thermal factor – hot environment weakens magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was determined by applying a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap {between} the magnet and the plate reduces the lifting capacity.

Precautions

Avoid bringing neodymium magnets close to a phone or GPS.

Intense magnetic fields generated by neodymium magnets interfere with compasses and magnetometers used in navigation, as well as internal compasses of smartphones and GPS devices.

The magnet is coated with nickel - be careful if you have an allergy.

Studies show a small percentage of people have allergies to certain metals, including nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.

Magnets will attract to each other, so remember not to allow them to pinch together without control or place your fingers in their path.

If the joining of neodymium magnets is not controlled, then they may crumble and crack. You can't move them to each other. At a distance less than 10 cm you should have them extremely strongly.

Neodymium magnetic are extremely fragile, resulting in shattering.

Neodymium magnets are fragile and will break if allowed to collide with each other, even from a distance of a few centimeters. Despite being made of metal and coated with a shiny nickel plating, they are not as hard as steel. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.

Keep neodymium magnets away from the wallet, computer, and TV.

Magnetic fields generated by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other similar devices. They can also damage televisions, VCRs, computer monitors, and CRT displays. Avoid placing neodymium magnets in close proximity to electronic devices.

Neodymium magnets should not be near people with pacemakers.

Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. However, if the magnetic field does not affect the device, it can damage its components or deactivate the device when it is in a magnetic field.

Dust and powder from neodymium magnets are flammable.

Do not attempt to drill into neodymium magnets. Mechanical processing is also not recommended. If the magnet is crushed into fine powder or dust, it becomes highly flammable.

Neodymium magnets can demagnetize at high temperatures.

Although magnets are generally resilient, their ability to maintain their magnetic potency can be influenced by factors like the type of material used, the magnet's shape, and the intended purpose for which it is employed.

  Magnets should not be treated as toys. Therefore, it is not recommended for children to have access to them.

Neodymium magnets are not toys. You cannot allow them to become toys for children. Small magnets pose a serious choking hazard or can attract to each other in the intestines. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.

Neodymium magnets are among the most powerful magnets on Earth. The astonishing force they generate between each other can shock you.

Familiarize yourself with our information to correctly handle these magnets and avoid significant swellings to your body and prevent damage to the magnets.

Warning!

Please see the article - What danger lies in neodymium magnets? You will learn how to handle them properly.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98