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neodymium magnets

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SM 25x175 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130369

GTIN: 5906301813170

0

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

175 mm

Weight

0.01 g

541.20 with VAT / pcs + price for transport

440.00 ZŁ net + 23% VAT / pcs

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SM 25x175 [2xM8] / N52 - magnetic separator
Specification/characteristics SM 25x175 [2xM8] / N52 - magnetic separator
properties
values
Cat. no.
130369
GTIN
5906301813170
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
175 mm [±0,1 mm]
Weight
0.01 g
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

It is the "heart" of every magnetic filter used in industry for cleaning raw materials. It is commonly used for cleaning flour, sugar, plastic granules, as well as oils and coolants. 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. The core is a precise magnetic system generating high induction (Gauss). Such construction ensures full resistance to corrosion, water, oils, and acids.
Due to the high power of the magnet, direct removal of filings can be troublesome and time-consuming. We recommend sticking packing tape to the cluster of filings and tearing it off together with the contaminants. 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. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. For the food and precision industry, we recommend the highest induction parameters.
We can produce a rod of non-standard length with any mounting termination. The rod end is strictly adapted to the fastening system in your device. We ensure fast realization of special orders and technical advice.

Strengths as well as weaknesses of NdFeB magnets.

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

  • They have stable power, and over around 10 years their performance decreases symbolically – ~1% (in testing),
  • They feature excellent resistance to magnetism drop when exposed to external magnetic sources,
  • In other words, due to the aesthetic surface of gold, the element gains a professional look,
  • Magnets are distinguished by maximum magnetic induction on the active area,
  • Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
  • Possibility of exact shaping as well as modifying to individual conditions,
  • Universal use in modern technologies – they find application in data components, electric drive systems, advanced medical instruments, also other advanced devices.
  • Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in small systems

What to avoid - cons of neodymium magnets: application proposals

  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only protects them against impacts but also raises their 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
  • Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
  • Due to limitations in producing threads and complicated shapes in magnets, we propose using casing - magnetic mount.
  • Health risk to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small components of these devices are able to complicate diagnosis medical in case of swallowing.
  • With large orders the cost of neodymium magnets is a challenge,

Maximum magnetic pulling forcewhat it depends on?

Holding force of 0 kg is a result of laboratory testing executed under standard conditions:

  • using a sheet made of high-permeability steel, serving as a ideal flux conductor
  • whose transverse dimension equals approx. 10 mm
  • with an ideally smooth touching surface
  • with total lack of distance (without paint)
  • under vertical force direction (90-degree angle)
  • in neutral thermal conditions

Lifting capacity in practice – influencing factors

Please note that the application force may be lower depending on the following factors, in order of importance:

  • Gap between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity 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 passes through the material instead of converting into lifting capacity.
  • Steel type – mild steel gives the best results. Alloy admixtures reduce magnetic permeability and lifting capacity.
  • Smoothness – ideal contact is obtained only on smooth steel. Rough texture create air cushions, reducing force.
  • Thermal conditions – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was assessed by applying a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.

H&S for magnets

Physical harm

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

Fragile material

Beware of splinters. Magnets can fracture upon violent connection, launching shards into the air. Eye protection is mandatory.

GPS Danger

Navigation devices and mobile phones are extremely sensitive to magnetism. Close proximity with a strong magnet can permanently damage the internal compass in your phone.

Metal Allergy

Nickel alert: The nickel-copper-nickel coating consists of nickel. If an allergic reaction happens, immediately stop working with magnets and wear gloves.

Implant safety

Individuals with a heart stimulator must maintain an large gap from magnets. The magnetic field can stop the operation of the life-saving device.

Danger to the youngest

Absolutely keep magnets away from children. Choking hazard is significant, and the consequences of magnets clamping inside the body are life-threatening.

Dust is flammable

Powder created during machining of magnets is self-igniting. Avoid drilling into magnets unless you are an expert.

Permanent damage

Monitor thermal conditions. Heating the magnet above 80 degrees Celsius will permanently weaken its properties and strength.

Keep away from computers

Intense magnetic fields can erase data on payment cards, hard drives, and storage devices. Keep a distance of at least 10 cm.

Safe operation

Handle magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their power.

Caution!

Need more info? Read our article: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98