Neodymium magnet, block, 80×20×4 mm, with 2 holes M4 (south pole on the countersunk side) - N38
Neodymium magnet, block, 80x20x4 mm, with 2 holes M4
logo of the online store selling magnets - orodian

Neodymium magnet, block, 80×20×4 mm, with 2 holes M4 (south pole on the countersunk side) – N38

8,85€ inc. Vat

The magnet has a south pole on the face (with a hole for the screw head).

Quantity discounts
From 1 pc:8,85€
From 2 pcs: 7,82€
From 5 pcs: 7,02€
From 15 pcs: 6,49€
From 50 pcs: Request a quote
In stock: 595 pcs
SKU: K80-20-4-N38-2M4-S Category: Tags: ,

Properties

Length

80 mm
Width

20 mm
Height

4 mm
Holes size

M4
Magnetic strength

11,8 kg
Magnetisation direction

in the direction of thickness (shortest dimension)
Material

NdFeB – N38 (neodymium magnet)
Surface

three layers: nickel-copper-nickel
Temperature resistance

up to 80 °C
Weight

47 g
4 mm 80 mm 20 mm

Product description

The magnet is made of the world's strongest magnetic material NdFeB. This material is up to 10 times stronger than conventional ferrite magnets.

The table above shows the strength of the magnet. This is the force required to pull the magnet away from a thick steel surface under the following ideal conditions:

  • The surface is made of pure steel and is at least half the thickness of the magnet itself.
  • The magnet touches the surface with the entire surface.
  • The magnet is pulled perpendicular to the surface (away from the surface).
  • There is no gap between the magnet and the metal surface (e.g. paint coating).

In most cases, these conditions are not met and the strength tends to be several times lower. For more information, see the article What is the strength of a magnet in kg?

Brittleness

Although neodymium magnets look metallic, they are actually brittle and can break when hit:

If the magnets are going to be exposed to shocks, we recommend using our pot magnets instead of using this magnet. The steel pot is designed to protect the magnet from impacts.

Surface treatment

There are three layers of protection on the surface of the magnet: nickel, copper and nickel again. If damaged, the magnet may begin to oxidise and gradually lose strength. If the magnet is likely to be subjected to shock or severe scratching, we recommend using our pot magnets. The steel pot protects the magnet from impacts and scratches.

The nickel-copper-nickel finish is not moisture resistant and is not suitable for outdoor use. We recommend our waterproof magnets for use outdoors or in humid environments.

Drilling, sawing, welding...

Neodymium magnets are brittle, sensitive to high temperature and oxidize easily. The magnet may break when drilling or sawing with unsuitable tools. A magnet with a damaged surface finish may lose some of its strength over time. Therefore, we do not recommend mechanical processing of magnets. We can meet special requirements for the shape of magnets. For more information, visit Custom-made magnets.

High temperatures

Conventional neodymium magnets lose some of their strength when heated above 80 °C, and sometimes at lower temperatures. If you need a magnet with higher temperature resistance, see the category Magnets with high temperature resistance. The magnet is not affected by low temperatures.

Further information

For more information, see our FAQ page and our blog. You can calculate the pull-off force and magnetic field of any neodymium magnet with our magnetic calculator.

Do you need help?

Our magnet experts are available every working day. If you would like advice on your choice, please contact us at info@orodian.com or on +421 46 202 1200.

You might also like: