UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Pros and cons of rare earth magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They do not lose strength, even during around ten years – the drop in lifting capacity is only ~1% (based on measurements),
• Magnets perfectly protect themselves against demagnetization caused by ambient magnetic noise,
• By using a decorative layer of silver, the element gains an aesthetic look,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Thanks to resistance to high temperature, they can operate (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to freedom in designing and the capacity to customize to unusual requirements,
• Versatile presence in advanced technology sectors – they are commonly used in mass storage devices, electric motors, medical equipment, as well as industrial machines.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can rust. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of creating nuts in the magnet and complex forms - recommended is a housing - magnet mounting.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting capacity of the magnet – what it depends on?

The force parameter is a measurement result conducted under specific, ideal conditions:

• with the application of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
• whose transverse dimension equals approx. 10 mm
• with an polished contact surface
• without any insulating layer between the magnet and steel
• during pulling in a direction perpendicular to the plane
• in temp. approx. 20°C

Practical lifting capacity: influencing factors

In practice, the real power depends on many variables, ranked from most significant:

• Clearance – existence of any layer (rust, tape, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Material type – the best choice is pure iron steel. Hardened steels may have worse magnetic properties.
• Surface finish – ideal contact is obtained only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet and the plate decreases the load capacity.