UMGW 32x18x8 [M6] GW / N38 - magnetic holder internal thread

Strengths as well as weaknesses of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
• They are extremely resistant to demagnetization induced by external disturbances,
• In other words, due to the smooth surface of silver, the element looks attractive,
• The surface of neodymium magnets generates a intense magnetic field – this is a distinguishing feature,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• In view of the potential of free shaping and customization to unique requirements, magnetic components can be produced in a broad palette of shapes and sizes, which makes them more universal,
• Huge importance in innovative solutions – they find application in computer drives, electric motors, advanced medical instruments, as well as other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we advise placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• NdFeB magnets lose power when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (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 very resistant to heat
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation and corrosion.
• Due to limitations in creating nuts and complex shapes in magnets, we recommend using a housing - magnetic holder.
• Possible danger resulting from small fragments of magnets can be dangerous, if swallowed, which is particularly important in the context of child safety. Furthermore, small components of these magnets are able to complicate diagnosis medical when they are in the body.
• Due to expensive raw materials, their price is relatively high,

Optimal lifting capacity of a neodymium magnet – what affects it?

The specified lifting capacity refers to the maximum value, obtained under optimal environment, specifically:

• using a base made of low-carbon steel, acting as a circuit closing element
• possessing a massiveness of at least 10 mm to avoid saturation
• with an ideally smooth contact surface
• with zero gap (no paint)
• during detachment in a direction perpendicular to the plane
• at conditions approx. 20°C

Impact of factors on magnetic holding capacity in practice

During everyday use, the actual holding force is determined by several key aspects, listed from crucial:

• Space between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or dirt) drastically reduces the pulling force, often by half at just 0.5 mm.
• Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Plate thickness – too thin plate does not close the flux, causing part of the flux to be lost to the other side.
• Steel grade – the best choice is high-permeability steel. Stainless steels may generate lower lifting capacity.
• Smoothness – ideal contact is possible only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was determined by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.