UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Strengths as well as weaknesses of NdFeB magnets.

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

• Their power remains stable, and after around ten years it decreases only by ~1% (theoretically),
• Magnets effectively protect themselves against demagnetization caused by ambient magnetic noise,
• In other words, due to the reflective surface of nickel, the element gains visual value,
• Magnets are distinguished by very high magnetic induction on the active area,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
• In view of the possibility of accurate molding and adaptation to individualized needs, magnetic components can be created in a wide range of geometric configurations, which makes them more universal,
• Versatile presence in innovative solutions – they are used in hard drives, electric motors, medical devices, as well as multitasking production systems.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• Neodymium magnets decrease their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain durability even at temperatures up to 230°C
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture
• Limited ability of creating threads in the magnet and complex shapes - preferred is a housing - mounting mechanism.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. Additionally, tiny parts of these devices can be problematic in diagnostics medical after entering the body.
• With budget limitations the cost of neodymium magnets can be a barrier,

Magnetic strength at its maximum – what contributes to it?

Magnet power was determined for the most favorable conditions, assuming:

• with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• with an ground contact surface
• without the slightest clearance between the magnet and steel
• for force applied at a right angle (in the magnet axis)
• at room temperature

Key elements affecting lifting force

Please note that the application force will differ depending on the following factors, starting with the most relevant:

• Distance (between the magnet and the plate), as even a microscopic distance (e.g. 0.5 mm) can cause a reduction in force by up to 50% (this also applies to paint, corrosion or debris).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
• Steel thickness – too thin steel does not accept the full field, causing part of the power to be wasted to the other side.
• Steel grade – the best choice is pure iron steel. Cast iron may attract less.
• Surface condition – ground elements guarantee perfect abutment, which improves field saturation. Uneven metal weaken the grip.
• Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was determined using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, whereas under parallel forces the holding force is lower. Additionally, even a small distance {between} the magnet and the plate decreases the load capacity.