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neodymium magnets

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SM 25x150 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130289

GTIN: 5906301812821

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

150 mm

Weight

0.01 g

393.60 with VAT / pcs + price for transport

320.00 ZŁ net + 23% VAT / pcs

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SM 25x150 [2xM8] / N42 - magnetic separator
Specification/characteristics SM 25x150 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130289
GTIN
5906301812821
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 N42

properties
values
units
remenance Br [Min. - Max.] ?
12.9-13.2
kGs
remenance Br [Min. - Max.] ?
1290-1320
T
coercivity bHc ?
10.8-12.0
kOe
coercivity bHc ?
860-955
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
40-42
BH max MGOe
energy density [Min. - Max.] ?
318-334
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 the "heart" of every magnetic filter used in industry for cleaning raw materials. Its task is separation (separation) of metal filings from the transported material. Thanks to the use of strong neodymium magnets, the rod catches even metallic dust.
The rod consists of a cover tube made of high-quality acid-resistant steel (AISI 304 or 316). Inside there is a stack of strong neodymium magnets arranged in a special configuration (magnetic circuit). Such construction ensures full resistance to corrosion, water, oils, and acids.
Metal filings stick to the surface very strongly, so cleaning requires strength or cleverness. The most effective home method is using adhesive tape, which we wrap around the dirt and peel off. In industry, cover tubes (so-called Easy Clean system) are used, from which the magnetic insert slides out.
The more Gauss, the smaller and more weakly magnetic particles will be effectively caught. For basic machine protection against pieces of iron, standard power is sufficient. High induction is necessary when contaminants are microscopic or weakly magnetic.
We fulfill individual orders for bars perfectly matched to your machine or separator. We offer various tip options: threaded holes (e.g., M8, M10), protruding screws, flat pivots, mills, or handles. Contact us for a quote on a non-standard dimension.

Strengths as well as weaknesses of NdFeB magnets.

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

  • They retain attractive force for around 10 years – the drop is just ~1% (in theory),
  • Magnets effectively resist against loss of magnetization caused by foreign field sources,
  • In other words, due to the reflective layer of gold, the element gains visual value,
  • They are known for high magnetic induction at the operating surface, making them more effective,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures reaching 230°C and above...
  • Possibility of custom modeling and optimizing to individual needs,
  • Wide application in modern technologies – they are commonly used in mass storage devices, brushless drives, precision medical tools, also modern systems.
  • Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

  • At very strong impacts they can break, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
  • When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited possibility of making threads in the magnet and complex shapes - recommended is casing - magnet mounting.
  • Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small elements of these devices are able to be problematic in diagnostics medical after entering the body.
  • With large orders the cost of neodymium magnets can be a barrier,

Optimal lifting capacity of a neodymium magnetwhat contributes to it?

The specified lifting capacity represents the peak performance, recorded under optimal environment, namely:

  • using a base made of high-permeability steel, serving as a magnetic yoke
  • with a cross-section no less than 10 mm
  • with a surface cleaned and smooth
  • without the slightest clearance between the magnet and steel
  • under axial application of breakaway force (90-degree angle)
  • at room temperature

What influences lifting capacity in practice

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

  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
  • Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
  • Material type – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
  • Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
  • Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was measured with the use of a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the lifting capacity.

Safety rules for work with neodymium magnets

Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If redness appears, immediately stop working with magnets and use protective gear.

Danger to the youngest

These products are not toys. Accidental ingestion of multiple magnets may result in them connecting inside the digestive tract, which constitutes a critical condition and necessitates immediate surgery.

Hand protection

Large magnets can smash fingers instantly. Do not put your hand betwixt two strong magnets.

Implant safety

Individuals with a heart stimulator should maintain an safe separation from magnets. The magnetism can stop the operation of the implant.

Do not underestimate power

Exercise caution. Rare earth magnets act from a distance and snap with huge force, often faster than you can react.

Heat warning

Watch the temperature. Exposing the magnet above 80 degrees Celsius will ruin its magnetic structure and strength.

GPS and phone interference

GPS units and mobile phones are highly susceptible to magnetic fields. Direct contact with a powerful NdFeB magnet can permanently damage the internal compass in your phone.

Magnets are brittle

Beware of splinters. Magnets can explode upon uncontrolled impact, launching sharp fragments into the air. Wear goggles.

Fire risk

Dust generated during cutting of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Cards and drives

Do not bring magnets near a purse, laptop, or TV. The magnetism can irreversibly ruin these devices and erase data from cards.

Attention!

Details about risks in the article: Magnet Safety Guide.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98