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neodymium magnets

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SM 25x325 [2xM8] / N52 - magnetic separator

magnetic separator

Catalog no 130370

GTIN: 5906301813187

0

Diameter Ø

25 mm [±1 mm]

Height

325 mm [±1 mm]

Weight

0.01 g

Magnetic Flux

~ 9 500 Gauss [±5%]

984.00 with VAT / pcs + price for transport

800.00 ZŁ net + 23% VAT / pcs

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SM 25x325 [2xM8] / N52 - magnetic separator
Specification/characteristics SM 25x325 [2xM8] / N52 - magnetic separator
properties
values
Cat. no.
130370
GTIN
5906301813187
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±1 mm]
Height
325 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 - 12 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. High magnetic induction on the surface allows catching the finest iron particles.
The construction relies on a sealed, welded stainless steel housing, polished smooth. The center is filled with NdFeB magnets and pole pieces, arranged to maximize the field on the tube surface. Thanks to this, the rod is durable, hygienic, and easy to keep clean.
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. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. High induction is necessary when contaminants are microscopic or weakly magnetic.
We can produce a rod of non-standard length with any mounting termination. We offer various tip options: threaded holes (e.g., M8, M10), protruding screws, flat pivots, mills, or handles. We ensure fast realization of special orders and technical advice.

Advantages and disadvantages of NdFeB magnets.

Besides their stability, neodymium magnets are valued for these benefits:

  • They do not lose power, even over nearly 10 years – the drop in strength is only ~1% (theoretically),
  • Neodymium magnets are characterized by extremely resistant to magnetic field loss caused by magnetic disturbances,
  • A magnet with a smooth gold surface looks better,
  • Neodymium magnets generate maximum magnetic induction on a small surface, which increases force concentration,
  • Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
  • Considering the potential of precise shaping and adaptation to custom requirements, NdFeB magnets can be manufactured in a variety of shapes and sizes, which expands the range of possible applications,
  • Significant place in modern technologies – they are commonly used in mass storage devices, motor assemblies, advanced medical instruments, as well as complex engineering applications.
  • Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a steel housing, which not only protects them against impacts but also raises their durability
  • When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
  • When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
  • We suggest casing - magnetic holder, due to difficulties in producing threads inside the magnet and complex shapes.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these products can be problematic in diagnostics medical in case of swallowing.
  • Due to neodymium price, their price exceeds standard values,

Optimal lifting capacity of a neodymium magnetwhat it depends on?

Magnet power was defined for optimal configuration, taking into account:

  • with the application of a yoke made of special test steel, guaranteeing maximum field concentration
  • whose thickness equals approx. 10 mm
  • with an ideally smooth touching surface
  • with zero gap (without paint)
  • during pulling in a direction perpendicular to the plane
  • at room temperature

Determinants of lifting force in real conditions

In real-world applications, the actual holding force is determined by several key aspects, listed from crucial:

  • Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
  • Direction of force – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
  • Metal thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of converting into lifting capacity.
  • Material type – ideal substrate is pure iron steel. Hardened steels may attract less.
  • Surface structure – the more even the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
  • Temperature – heating the magnet results in weakening of force. Check the maximum operating temperature for a given model.

* Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under vertically applied force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet and the plate lowers the lifting capacity.

Safe handling of neodymium magnets

Sensitization to coating

Warning for allergy sufferers: The nickel-copper-nickel coating consists of nickel. If an allergic reaction appears, immediately stop handling magnets and wear gloves.

Do not give to children

Strictly keep magnets out of reach of children. Choking hazard is high, and the effects of magnets clamping inside the body are fatal.

Life threat

Health Alert: Strong magnets can turn off pacemakers and defibrillators. Stay away if you have medical devices.

Dust is flammable

Machining of neodymium magnets carries a risk of fire hazard. Neodymium dust oxidizes rapidly with oxygen and is hard to extinguish.

Pinching danger

Watch your fingers. Two powerful magnets will join instantly with a force of massive weight, destroying anything in their path. Be careful!

Eye protection

NdFeB magnets are sintered ceramics, meaning they are fragile like glass. Clashing of two magnets leads to them shattering into small pieces.

Safe operation

Exercise caution. Neodymium magnets act from a distance and connect with huge force, often quicker than you can react.

GPS and phone interference

A strong magnetic field negatively affects the operation of compasses in phones and navigation systems. Do not bring magnets near a smartphone to prevent damaging the sensors.

Threat to electronics

Data protection: Strong magnets can ruin payment cards and sensitive devices (pacemakers, hearing aids, timepieces).

Power loss in heat

Keep cool. NdFeB magnets are sensitive to heat. If you need operation above 80°C, look for HT versions (H, SH, UH).

Caution!

Need more info? Check our post: Are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98