Neodymium magnets - Orodian.com

Discs

Blocks

Cubes

Rings

Self-adhesive

With screw hole

Magnetic balls

In plastic cover

In addition to their tremendous strength, neodymium magnets have the following advantages:

They retain their strength. In 10 years, their strength will decrease by only 1%.
They are resistant to demagnetisation by external magnetic fields.
Thanks to the glossy finish, they have an aesthetic appearance.

Disadvantages of neodymium magnets:

They can break in a collision. If the magnets are exposed to impact, we recommend using magnets in a protective pot. The steel pot protects the magnet from impact while increasing its overall strength.
They lose strength at high temperatures. Most neodymium magnets experience a permanent loss of strength when heated above 80 °C. However, we also offer special magnets with high temperature resistance up to 240 °C.
They rust in a humid environment. For outdoor use, we recommend using waterproof magnets.

Neodymium magnets are made of NdFeB material – a mixture of neodymium, iron and boron. It is the strongest magnetic material we know. The NdFeB compound chemically reacts with oxygen in the air, which can cause a gradual loss of magnetic strength. To prevent oxidation, most of our neodymium magnets have three protective layers on the surface: nickel, copper and nickel again. In some cases, we also use zinc, gold, epoxy resin or rubber for surface treatment.

Large neodymium magnets (5 cm or more) can be dangerous. Their enormous magnetic force can cause severe finger pinches or bruises if handled carelessly. We have prepared a guide for our customers on how to handle strong magnets.

Neodymium magnets – frequently asked questions

For each magnet, the strength required to pull the magnet away from a thick steel surface under the following ideal conditions is given:

The surface is made of pure steel and is at least 3-10 mm thick (the exact thickness depends on the size of the magnet).
The metal surface is smooth.
The magnet touches the surface with its entire surface.
The magnet is pulled perpendicular to the surface (away from the surface).

Under these ideal conditions, a magnet with a strength of 1 kg can carry an object weighing 1 kg. In practice, however, ideal conditions are almost never achieved and the magnet can only support a fraction of this weight.

The magnetic strength is greatly reduced if the magnet is pulled in a direction other than perpendicular to the surface, the surface is uneven or too thin, the magnet does not touch the object with its entire surface, the object is not made of pure steel, or there is a layer of paint on it.

The strength of the magnet required depends very much on the specific application. We therefore recommend to our customers:

Order samples of several magnets and test them in practice.
Factor in a margin and use a stronger magnet to be on the safe side.
Seek to minimize strength-reducing factors.

You calculate the force expressed in Newtons by multiplying the stated force by the gravitational constant = 9.8 N/kg.

More information in the article: How strong a magnet do I need?

There are several types of NdFeB material from which neodymium magnets are made. These materials are designated by the letter N followed by two digits, for example N42 or N50. The letter N means that it is a neodymium magnet. The double-digit number expresses how strongly the material is magnetised (maximum energy product in MGOe). The larger the number after the letter N, the stronger the magnet. For example, a permanent magnet made of N52 material is 20% stronger than a magnet of the same dimensions made of N40 material. The strongest material is N55.

The number is sometimes followed by a suffix of one or two letters (e.g. N42H or N35UH) to indicate the increased temperature resistance of the magnet. At a temperature of around 80 °C, neodymium magnets without a suffix begin to lose strength permanently. Materials with the suffixes M, H, SH, UH, EH, AH have a temperature resistance of 100, 120, 150, 180, 200 and 240 °C. However, these figures are only approximate as temperature resistance depends on the shape of the magnet and its environment: more information on temperature resistance.

We do not recommend mechanical processing of neodymium magnets for the following reasons:

The NdFeB material is extremely hard and cannot be machined with conventional tools.
Mechanical machining generates high temperatures due to friction. When heated above 80 °C, most neodymium magnets lose some of their strength forever.
If the surface treatment of the magnet is disturbed, the NdFeB material is exposed. This compound oxidises when exposed to air and the magnet gradually loses its strength.

We have magnets in various shapes and sizes for sale. Have a look at the main page for a list of categories. If you can’t find a suitable magnet in our range, we also offer custom magnets.

We recommend glue for gluing magnets UHU Max Repair or UHU Plus Endfest 300. We recommend that you clean the magnet from grease and roughen the surface with fine sandpaper before gluing. Do not use a hot air gun as the magnet may lose some of its strength due to the high temperature.

We also sell self-adhesive magnets or magnetic adhesive tapes and self-adhesive magnetic sheets.

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