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neodymium magnets

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SM 25x225 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130354

GTIN: 5906301813026

5

Diameter Ø

25 mm [±1 mm]

Height

225 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 9 500 Gauss [±5%]

688.80 with VAT / pcs + price for transport

560.00 ZŁ net + 23% VAT / pcs

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SM 25x225 [2xM8] / N52 - magnetic separator
Specification/characteristics SM 25x225 [2xM8] / N52 - magnetic separator
properties
values
Cat. no.
130354
GTIN
5906301813026
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

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 construction relies on a sealed, welded stainless steel housing, polished smooth. 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.
Magnetic induction measured in Gauss (Gs) determines the density of magnetic flux on the rod surface. For basic machine protection against pieces of iron, standard power is sufficient. High induction is necessary when contaminants are microscopic or weakly magnetic.
We can produce a rod of non-standard length with any mounting termination. You can choose a mounting method consistent with your technical design. Contact us for a quote on a non-standard dimension.

Strengths and weaknesses of neodymium magnets.

Besides their tremendous magnetic power, neodymium magnets offer the following advantages:

  • They have stable power, and over nearly ten years their attraction force decreases symbolically – ~1% (in testing),
  • They are noted for resistance to demagnetization induced by external field influence,
  • In other words, due to the aesthetic finish of gold, the element gains visual value,
  • Magnets are distinguished by impressive magnetic induction on the outer layer,
  • Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
  • Thanks to the option of flexible forming and customization to individualized requirements, NdFeB magnets can be created in a variety of geometric configurations, which expands the range of possible applications,
  • Universal use in modern technologies – they are utilized in data components, brushless drives, medical devices, as well as complex engineering applications.
  • Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Problematic aspects of neodymium magnets and ways of using them

  • To avoid cracks under impact, we suggest using special steel housings. Such a solution protects the magnet and simultaneously improves its durability.
  • When exposed to high temperature, neodymium magnets experience a drop in strength. 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
  • We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical when they are in the body.
  • With large orders the cost of neodymium magnets is economically unviable,

Detachment force of the magnet in optimal conditionswhat it depends on?

The lifting capacity listed is a measurement result executed under specific, ideal conditions:

  • using a plate made of high-permeability steel, serving as a ideal flux conductor
  • with a thickness no less than 10 mm
  • characterized by even structure
  • under conditions of gap-free contact (metal-to-metal)
  • during detachment in a direction perpendicular to the plane
  • at temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

Bear in mind that the working load will differ influenced by elements below, starting with the most relevant:

  • Distance – existence of any layer (rust, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the maximum value.
  • Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
  • Chemical composition of the base – mild steel attracts best. Higher carbon content decrease magnetic properties and holding force.
  • Plate texture – smooth surfaces ensure maximum contact, which improves force. Uneven metal weaken the grip.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate decreases the lifting capacity.

Safe handling of neodymium magnets

Cards and drives

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

Life threat

Medical warning: Neodymium magnets can turn off pacemakers and defibrillators. Do not approach if you have electronic implants.

GPS Danger

A strong magnetic field interferes with the functioning of magnetometers in smartphones and GPS navigation. Maintain magnets close to a smartphone to avoid damaging the sensors.

Dust explosion hazard

Drilling and cutting of NdFeB material poses a fire risk. Magnetic powder reacts violently with oxygen and is hard to extinguish.

Hand protection

Mind your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing anything in their path. Exercise extreme caution!

Skin irritation risks

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

Adults only

These products are not intended for children. Accidental ingestion of multiple magnets can lead to them connecting inside the digestive tract, which constitutes a direct threat to life and requires immediate surgery.

Do not overheat magnets

Standard neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.

Material brittleness

Despite metallic appearance, the material is brittle and cannot withstand shocks. Do not hit, as the magnet may crumble into sharp, dangerous pieces.

Respect the power

Use magnets with awareness. Their powerful strength can shock even professionals. Stay alert and do not underestimate their power.

Attention!

More info about risks in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98