UMGW 16x13x5 [M4] GW / N38 - magnetic holder internal thread

Advantages and disadvantages of rare earth magnets.

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

• Their power is durable, and after approximately 10 years it drops only by ~1% (theoretically),
• Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the glossy finish of nickel, the element gains a professional look,
• Magnets exhibit excellent magnetic induction on the surface,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to flexibility in shaping and the ability to customize to client solutions,
• Versatile presence in modern industrial fields – they serve a role in HDD drives, motor assemblies, medical equipment, and other advanced devices.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• Neodymium magnets demagnetize 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 very resistant to heat
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• We suggest casing - magnetic mechanism, due to difficulties in creating nuts inside the magnet and complex shapes.
• Potential hazard resulting from small fragments of magnets are risky, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these products are able to be problematic in diagnostics medical when they are in 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?

The force parameter is a theoretical maximum value performed under the following configuration:

• with the use of a yoke made of low-carbon steel, guaranteeing maximum field concentration
• with a cross-section minimum 10 mm
• with a surface free of scratches
• without any air gap between the magnet and steel
• for force applied at a right angle (pull-off, not shear)
• in stable room temperature

Lifting capacity in real conditions – factors

During everyday use, the actual lifting capacity depends on many variables, ranked from the most important:

• Clearance – the presence of foreign body (rust, dirt, air) interrupts the magnetic circuit, which lowers capacity steeply (even by 50% at 0.5 mm).
• Direction of force – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Steel grade – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
• Surface structure – the more even the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the load capacity is reduced by as much as 5 times. Moreover, even a minimal clearance {between} the magnet and the plate lowers the load capacity.