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neodymium magnets

We offer yellow color magnetic Nd2Fe14B - our offer. Practically all "magnets" in our store are available for immediate delivery (see the list). Check out the magnet pricing for more details check the magnet price list

Magnets for fishing F300 GOLD

Where to purchase strong neodymium magnet? Magnetic holders in solid and airtight enclosure are excellent for use in variable and difficult weather conditions, including during snow and rain see

magnets with holders

Magnetic holders can be used to facilitate manufacturing, underwater discoveries, or finding meteors from gold see more...

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SM 25x100 [2xM8] / N42 - magnetic separator

magnetic separator

Catalog no 130287

GTIN: 5906301812807

5

Diameter Ø [±0,1 mm]

25 mm

Height [±0,1 mm]

100 mm

Weight

0.01 g

246.00 with VAT / pcs + price for transport

200.00 ZŁ net + 23% VAT / pcs

bulk discounts:

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price from 1 pcs
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Lifting power along with shape of neodymium magnets can be calculated using our modular calculator.

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SM 25x100 [2xM8] / N42 - magnetic separator
Specification/characteristics SM 25x100 [2xM8] / N42 - magnetic separator
properties
values
Cat. no.
130287
GTIN
5906301812807
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
25 mm [±0,1 mm]
Height
100 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

This product serves to effectively catch ferromagnetic contaminants from bulk and liquid products. It is commonly used for cleaning flour, sugar, plastic granules, as well as oils and coolants. 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. 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. The economical version (8kGs) handles large pieces of metal perfectly. 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. Contact us for a quote on a non-standard dimension.

Pros and cons of neodymium magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

  • They have stable power, and over nearly 10 years their performance decreases symbolically – ~1% (according to theory),
  • They retain their magnetic properties even under strong external field,
  • The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to look better,
  • The surface of neodymium magnets generates a strong magnetic field – this is one of their assets,
  • Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
  • In view of the possibility of flexible forming and customization to specialized solutions, neodymium magnets can be modeled in a wide range of forms and dimensions, which amplifies use scope,
  • Key role in electronics industry – they are utilized in magnetic memories, drive modules, medical equipment, also modern systems.
  • Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of NdFeB magnets:

  • To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
  • NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of power (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
  • 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 mechanism, due to difficulties in creating threads inside the magnet and complex shapes.
  • Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which becomes key 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,

Best holding force of the magnet in ideal parameterswhat contributes to it?

The load parameter shown concerns the maximum value, recorded under ideal test conditions, namely:

  • on a base made of structural steel, effectively closing the magnetic flux
  • with a cross-section no less than 10 mm
  • with a plane free of scratches
  • without any clearance between the magnet and steel
  • under vertical application of breakaway force (90-degree angle)
  • in temp. approx. 20°C

Magnet lifting force in use – key factors

Holding efficiency impacted by working environment parameters, mainly (from priority):

  • Clearance – the presence of foreign body (rust, tape, gap) acts as an insulator, which lowers capacity rapidly (even by 50% at 0.5 mm).
  • Load vector – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
  • Plate thickness – insufficiently thick plate causes magnetic saturation, causing part of the power to be lost to the other side.
  • Material type – ideal substrate is pure iron steel. Cast iron may attract less.
  • Surface structure – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
  • Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

* Holding force was tested on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under parallel forces the holding force is lower. Additionally, even a minimal clearance {between} the magnet and the plate lowers the load capacity.

Precautions when working with neodymium magnets

Precision electronics

A strong magnetic field interferes with the operation of compasses in phones and GPS navigation. Maintain magnets close to a smartphone to prevent damaging the sensors.

Crushing force

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

Health Danger

Warning for patients: Powerful magnets disrupt electronics. Maintain minimum 30 cm distance or ask another person to work with the magnets.

Magnets are brittle

Neodymium magnets are ceramic materials, meaning they are prone to chipping. Clashing of two magnets leads to them cracking into small pieces.

Skin irritation risks

Certain individuals experience a sensitization to Ni, which is the common plating for NdFeB magnets. Extended handling may cause dermatitis. We recommend use protective gloves.

Handling guide

Before use, read the rules. Sudden snapping can break the magnet or hurt your hand. Think ahead.

Permanent damage

Control the heat. Exposing the magnet to high heat will permanently weaken its magnetic structure and pulling force.

Machining danger

Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.

Threat to electronics

Avoid bringing magnets close to a purse, laptop, or TV. The magnetic field can permanently damage these devices and wipe information from cards.

Swallowing risk

Product intended for adults. Small elements pose a choking risk, leading to intestinal necrosis. Keep away from kids and pets.

Security!

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