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neodymium magnets

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SM 25x225 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130292

GTIN: 5906301812852

0

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

225 mm

Weight

0.01 g

615.00 with VAT / pcs + price for transport

500.00 ZŁ net + 23% VAT / pcs

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SM 25x225 [2xM8] / N42 - magnetic separator
Specification/characteristics SM 25x225 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130292
GTIN
5906301812852
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
225 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 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). Thanks to this, the rod is durable, hygienic, and easy to keep clean.
Metal contaminants are strongly attracted, so removing them with a bare hand or glove can be difficult. 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.
The Gauss value tells us how effectively and deeply the magnet will catch contaminants. Standard rods (~8000 Gs) are sufficient for catching screws, nails, and steel shavings. High Power versions (~12000-14000 Gs) are necessary for catching metallic dust, oxides, and stainless steel after processing.
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. We ensure fast realization of special orders and technical advice.

Advantages as well as disadvantages of rare earth magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

  • Their strength is maintained, and after around 10 years it decreases only by ~1% (according to research),
  • They do not lose their magnetic properties even under close interference source,
  • A magnet with a shiny silver surface is more attractive,
  • Neodymium magnets deliver maximum magnetic induction on a small surface, which increases force concentration,
  • Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
  • Possibility of custom creating and modifying to atypical needs,
  • Key role in high-tech industry – they are utilized in HDD drives, motor assemblies, medical devices, also multitasking production systems.
  • Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which enables their usage in compact constructions

Disadvantages of NdFeB magnets:

  • Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only protects them against impacts but also increases their durability
  • When exposed to high temperature, neodymium magnets suffer 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
  • They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
  • Limited possibility of making threads in the magnet and complicated shapes - preferred is a housing - mounting mechanism.
  • Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Additionally, tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
  • Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnetwhat affects it?

The load parameter shown refers to the maximum value, measured under laboratory conditions, namely:

  • with the use of a sheet made of special test steel, guaranteeing full magnetic saturation
  • whose transverse dimension is min. 10 mm
  • with an polished contact surface
  • under conditions of ideal adhesion (surface-to-surface)
  • under vertical force vector (90-degree angle)
  • at standard ambient temperature

Lifting capacity in real conditions – factors

Holding efficiency is affected by specific conditions, including (from most important):

  • Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
  • Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
  • Base massiveness – too thin sheet does not accept the full field, causing part of the flux to be escaped into the air.
  • Plate material – mild steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
  • Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures gain strength (up to a certain limit).

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet and the plate reduces the holding force.

Safe handling of neodymium magnets

Magnetic interference

A powerful magnetic field negatively affects the operation of compasses in phones and navigation systems. Keep magnets near a device to avoid breaking the sensors.

Medical implants

Health Alert: Strong magnets can deactivate heart devices and defibrillators. Stay away if you have electronic implants.

Magnets are brittle

Protect your eyes. Magnets can explode upon violent connection, ejecting sharp fragments into the air. We recommend safety glasses.

Do not underestimate power

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.

Electronic devices

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

Maximum temperature

Avoid heat. Neodymium magnets are susceptible to heat. If you require resistance above 80°C, look for special high-temperature series (H, SH, UH).

Physical harm

Risk of injury: The attraction force is so great that it can cause hematomas, pinching, and even bone fractures. Use thick gloves.

Danger to the youngest

Neodymium magnets are not intended for children. Eating multiple magnets can lead to them pinching intestinal walls, which poses a critical condition and requires immediate surgery.

Dust is flammable

Machining of neodymium magnets carries a risk of fire risk. Neodymium dust reacts violently with oxygen and is hard to extinguish.

Metal Allergy

Some people suffer from a sensitization to nickel, which is the standard coating for NdFeB magnets. Prolonged contact can result in skin redness. We strongly advise use protective gloves.

Attention!

Want to know more? Read our article: Why are neodymium magnets dangerous?

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98