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neodymium magnets

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SM 18x300 [2xM5] / N42 - magnetic separator

magnetic separator

Catalog no 130277

GTIN: 5906301812791

0

Diameter Ø [±0,1 mm]

18 mm

Height [±0,1 mm]

300 mm

Weight

0.01 g

664.20 with VAT / pcs + price for transport

540.00 ZŁ net + 23% VAT / pcs

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SM 18x300 [2xM5] / N42 - magnetic separator
Specification/characteristics SM 18x300 [2xM5] / N42 - magnetic separator
properties
values
Cat. no.
130277
GTIN
5906301812791
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
18 mm [±0,1 mm]
Height
300 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. High magnetic induction on the surface allows catching the finest iron particles.
The outer layer is hygienic acid-resistant steel, approved for food contact. The core is a precise magnetic system generating high induction (Gauss). 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. You can use compressed air or special non-magnetic strippers (rings). For easier operation, it is worth considering ordering a rod in a version with a cleaning sleeve.
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. For the food and precision industry, we recommend the highest induction parameters.
Yes, as a manufacturer, we make rods of any length and diameter (standard is dia 25mm and 32mm). The rod end is strictly adapted to the fastening system in your device. We ensure fast realization of special orders and technical advice.

Advantages as well as disadvantages of NdFeB magnets.

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

  • They do not lose magnetism, even during approximately 10 years – the reduction in power is only ~1% (according to tests),
  • Magnets very well protect themselves against demagnetization caused by external fields,
  • A magnet with a smooth gold surface looks better,
  • They feature high magnetic induction at the operating surface, which affects their effectiveness,
  • 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 individual shaping as well as modifying to specific requirements,
  • Universal use in high-tech industry – they find application in mass storage devices, motor assemblies, diagnostic systems, and modern systems.
  • Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Disadvantages of NdFeB magnets:

  • To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
  • Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape and 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
  • Magnets exposed to a humid environment can rust. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
  • Due to limitations in producing threads and complicated shapes in magnets, we propose using casing - magnetic mount.
  • Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child health protection. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what it depends on?

The declared magnet strength refers to the maximum value, recorded under ideal test conditions, namely:

  • on a base made of mild steel, effectively closing the magnetic flux
  • with a thickness minimum 10 mm
  • with a plane free of scratches
  • under conditions of gap-free contact (surface-to-surface)
  • under perpendicular force vector (90-degree angle)
  • at room temperature

Lifting capacity in practice – influencing factors

In practice, the real power is determined by many variables, presented from crucial:

  • Gap (between the magnet and the metal), since even a very small distance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to paint, corrosion or dirt).
  • Angle of force application – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is typically several times lower (approx. 1/5 of the lifting capacity).
  • Plate thickness – too thin steel causes magnetic saturation, causing part of the flux to be wasted to the other side.
  • Material type – ideal substrate is high-permeability steel. Stainless steels may have worse magnetic properties.
  • Plate texture – ground elements guarantee perfect abutment, which increases field saturation. Uneven metal reduce efficiency.
  • Temperature – heating the magnet causes a temporary drop of induction. Check the thermal limit for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of optimal thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.

H&S for magnets

Life threat

People with a ICD must maintain an absolute distance from magnets. The magnetic field can disrupt the functioning of the implant.

Handling rules

Handle magnets with awareness. Their powerful strength can surprise even experienced users. Plan your moves and respect their force.

Danger to the youngest

Adult use only. Small elements can be swallowed, leading to intestinal necrosis. Store away from children and animals.

Allergy Warning

Warning for allergy sufferers: The nickel-copper-nickel coating contains nickel. If skin irritation occurs, cease handling magnets and wear gloves.

Electronic hazard

Avoid bringing magnets close to a wallet, laptop, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.

Dust explosion hazard

Machining of NdFeB material poses a fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.

GPS Danger

Be aware: neodymium magnets generate a field that interferes with sensitive sensors. Keep a safe distance from your phone, device, and navigation systems.

Bone fractures

Pinching hazard: The attraction force is so immense that it can cause blood blisters, crushing, and even bone fractures. Protective gloves are recommended.

Power loss in heat

Standard neodymium magnets (N-type) lose magnetization when the temperature goes above 80°C. The loss of strength is permanent.

Risk of cracking

Neodymium magnets are sintered ceramics, which means they are fragile like glass. Collision of two magnets leads to them shattering into small pieces.

Attention!

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