UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

Pros as well as cons of NdFeB magnets.

Apart from their notable power, neodymium magnets have these key benefits:

• They retain full power for around ten years – the loss is just ~1% (according to analyses),
• Magnets perfectly resist against demagnetization caused by foreign field sources,
• The use of an aesthetic layer of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• The surface of neodymium magnets generates a maximum magnetic field – this is a distinguishing feature,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to modularity in designing and the capacity to adapt to client solutions,
• Wide application in high-tech industry – they find application in mass storage devices, electric drive systems, medical devices, also industrial machines.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a strong case, which not only secures them against impacts but also increases their durability
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Limited ability of making nuts in the magnet and complex forms - recommended is casing - magnet mounting.
• Potential hazard to health – tiny shards of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products can disrupt the diagnostic process medical after entering the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which can limit application in large quantities

Maximum magnetic pulling force – what affects it?

The declared magnet strength concerns the limit force, measured under optimal environment, specifically:

• with the use of a sheet made of low-carbon steel, ensuring full magnetic saturation
• with a cross-section minimum 10 mm
• characterized by lack of roughness
• without any air gap between the magnet and steel
• for force acting at a right angle (in the magnet axis)
• in temp. approx. 20°C

Lifting capacity in practice – influencing factors

Real force is affected by specific conditions, such as (from priority):

• Distance – existence of any layer (rust, tape, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically several times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Material composition – not every steel reacts the same. High carbon content worsen the attraction effect.
• Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces weaken the grip.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, in contrast under shearing force the holding force is lower. In addition, even a slight gap {between} the magnet and the plate reduces the load capacity.