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neodymium magnets

We provide yellow color magnets Nd2Fe14B - our proposal. All magnesy neodymowe in our store are available for immediate purchase (see the list). See the magnet pricing for more details check the magnet price list

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MW 8x20 / N38 - cylindrical magnet

cylindrical magnet

Catalog no 010475

GTIN: 5906301811138

5

Diameter Ø [±0,1 mm]

8 mm

Height [±0,1 mm]

20 mm

Weight

7.54 g

Magnetization Direction

→ diametrical

Load capacity

8.85 kg / 86.79 N

Magnetic Induction

607.01 mT

Coating

[NiCuNi] nickel

4.60 with VAT / pcs + price for transport

3.74 ZŁ net + 23% VAT / pcs

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MW 8x20 / N38 - cylindrical magnet
Specification/characteristics MW 8x20 / N38 - cylindrical magnet
properties
values
Cat. no.
010475
GTIN
5906301811138
Production/Distribution
Dhit sp. z o.o.
Country of origin
Poland / China / Germany
Customs code
85059029
Diameter Ø
8 mm [±0,1 mm]
Height
20 mm [±0,1 mm]
Weight
7.54 g [±0,1 mm]
Magnetization Direction
→ diametrical
Load capacity ~ ?
8.85 kg / 86.79 N
Magnetic Induction ~ ?
607.01 mT
Coating
[NiCuNi] nickel
Manufacturing Tolerance
± 0.1 mm

Magnetic properties of material N38

properties
values
units
remenance Br [Min. - Max.] ?
12.2-12.6
kGs
remenance Br [Min. - Max.] ?
1220-1260
T
coercivity bHc ?
10.8-11.5
kOe
coercivity bHc ?
860-915
kA/m
actual internal force iHc
≥ 12
kOe
actual internal force iHc
≥ 955
kA/m
energy density [Min. - Max.] ?
36-38
BH max MGOe
energy density [Min. - Max.] ?
287-303
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

The presented product is an exceptionally strong rod magnet, composed of modern NdFeB material, which, with dimensions of Ø8x20 mm, guarantees optimal power. This specific item features high dimensional repeatability and professional build quality, making it an excellent solution for the most demanding engineers and designers. As a magnetic rod with significant force (approx. 8.85 kg), this product is in stock from our European logistics center, ensuring rapid order fulfillment. Furthermore, its Ni-Cu-Ni coating shields it against corrosion in standard operating conditions, ensuring an aesthetic appearance and durability for years.
It finds application in DIY projects, advanced automation, and broadly understood industry, serving as a positioning or actuating element. Thanks to the high power of 86.79 N with a weight of only 7.54 g, this rod is indispensable in miniature devices and wherever every gram matters.
Since our magnets have a tolerance of ±0.1mm, the recommended way is to glue them into holes with a slightly larger diameter (e.g., 8.1 mm) using two-component epoxy glues. To ensure long-term durability in automation, anaerobic resins are used, which do not react with the nickel coating and fill the gap, guaranteeing durability of the connection.
Grade N38 is the most popular standard for professional neodymium magnets, offering a great economic balance and high resistance to demagnetization. If you need the strongest magnets in the same volume (Ø8x20), contact us regarding higher grades (e.g., N50, N52), however, N38 is the standard in continuous sale in our warehouse.
The presented product is a neodymium magnet with precisely defined parameters: diameter 8 mm and height 20 mm. The key parameter here is the holding force amounting to approximately 8.85 kg (force ~86.79 N), which, with such defined dimensions, proves the high grade of the NdFeB material. The product has a [NiCuNi] coating, which secures it against external factors, giving it an aesthetic, silvery shine.
This cylinder is magnetized axially (along the height of 20 mm), which means that the N and S poles are located on the flat, circular surfaces. Such an arrangement is most desirable when connecting magnets in stacks (e.g., in filters) or when mounting in sockets at the bottom of a hole. On request, we can also produce versions magnetized diametrically if your project requires it.

Pros as well as cons of neodymium magnets.

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

  • They do not lose strength, even during around 10 years – the decrease in lifting capacity is only ~1% (according to tests),
  • Neodymium magnets are distinguished by remarkably resistant to loss of magnetic properties caused by external field sources,
  • A magnet with a smooth gold surface is more attractive,
  • Magnetic induction on the working layer of the magnet is very high,
  • Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
  • Possibility of precise modeling and adapting to individual needs,
  • Wide application in advanced technology sectors – they serve a role in mass storage devices, drive modules, precision medical tools, also technologically advanced constructions.
  • Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Cons of neodymium magnets: application proposals

  • Brittleness 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 raises their durability
  • Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
  • Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
  • Limited ability of making nuts in the magnet and complicated shapes - recommended is cover - magnetic holder.
  • Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical after entering the body.
  • Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what affects it?

Magnet power was defined for the most favorable conditions, assuming:

  • on a plate made of mild steel, perfectly concentrating the magnetic flux
  • possessing a thickness of at least 10 mm to avoid saturation
  • with a plane free of scratches
  • without the slightest air gap between the magnet and steel
  • during pulling in a direction vertical to the plane
  • at ambient temperature room level

Magnet lifting force in use – key factors

It is worth knowing that the working load will differ depending on elements below, in order of importance:

  • Gap between surfaces – every millimeter of distance (caused e.g. by varnish or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
  • Load vector – maximum parameter is available only during pulling at a 90° angle. The shear force of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
  • Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux passes through the material instead of generating force.
  • Metal type – not every steel reacts the same. Alloy additives weaken the attraction effect.
  • Surface finish – ideal contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
  • Temperature – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under shearing force the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate decreases the load capacity.

Safety rules for work with NdFeB magnets

Dust is flammable

Dust created during machining of magnets is self-igniting. Do not drill into magnets unless you are an expert.

Keep away from children

Always store magnets out of reach of children. Ingestion danger is high, and the consequences of magnets connecting inside the body are life-threatening.

Bodily injuries

Large magnets can break fingers instantly. Do not put your hand betwixt two attracting surfaces.

Shattering risk

Despite the nickel coating, neodymium is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.

GPS and phone interference

Navigation devices and smartphones are highly sensitive to magnetism. Direct contact with a powerful NdFeB magnet can decalibrate the internal compass in your phone.

Power loss in heat

Watch the temperature. Exposing the magnet above 80 degrees Celsius will destroy its properties and strength.

Avoid contact if allergic

A percentage of the population have a hypersensitivity to Ni, which is the common plating for NdFeB magnets. Frequent touching can result in dermatitis. We recommend use protective gloves.

Keep away from computers

Equipment safety: Neodymium magnets can damage data carriers and sensitive devices (pacemakers, hearing aids, timepieces).

Powerful field

Before use, check safety instructions. Uncontrolled attraction can destroy the magnet or injure your hand. Think ahead.

Danger to pacemakers

Warning for patients: Powerful magnets disrupt electronics. Keep minimum 30 cm distance or request help to work with the magnets.

Safety First!

More info about hazards in the article: Safety of working with magnets.

Dhit sp. z o.o.

e-mail: bok@dhit.pl

tel: +48 888 99 98 98