UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread

Strengths as well as weaknesses of rare earth magnets.

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

• They do not lose strength, even after around 10 years – the reduction in strength is only ~1% (according to tests),
• They show high resistance to demagnetization induced by external field influence,
• By applying a reflective coating of nickel, the element gains an modern look,
• Neodymium magnets deliver maximum magnetic induction on a small area, which allows for strong attraction,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to freedom in shaping and the capacity to adapt to specific needs,
• Key role in electronics industry – they find application in magnetic memories, electromotive mechanisms, advanced medical instruments, and industrial machines.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets decrease their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. 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 rust. Therefore when using outdoors, we suggest using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in realizing threads and complicated shapes in magnets, we recommend using cover - magnetic mount.
• Potential hazard related to microscopic parts of magnets pose a threat, if swallowed, which gains importance in the context of child health protection. Furthermore, small components of these devices can complicate diagnosis medical after entering the body.
• Due to expensive raw materials, their price is relatively high,

Highest magnetic holding force – what affects it?

The declared magnet strength represents the limit force, recorded under laboratory conditions, namely:

• on a plate made of structural steel, optimally conducting the magnetic field
• whose transverse dimension is min. 10 mm
• with a surface free of scratches
• under conditions of gap-free contact (metal-to-metal)
• during detachment in a direction perpendicular to the plane
• at conditions approx. 20°C

Key elements affecting lifting force

Please note that the magnet holding may be lower subject to elements below, in order of importance:

• Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – note 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.
• Steel thickness – too thin sheet does not close the flux, causing part of the flux to be wasted into the air.
• Steel type – mild steel attracts best. Alloy admixtures decrease magnetic properties and holding force.
• Surface finish – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, however under shearing force the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate lowers the lifting capacity.