UMGW 60x30x15 [M10] GW / N38 - magnetic holder internal thread

Advantages as well as disadvantages of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• Their power remains stable, and after around ten years it decreases only by ~1% (according to research),
• Neodymium magnets are distinguished by remarkably resistant to magnetic field loss caused by external magnetic fields,
• Thanks to the metallic finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an aesthetic appearance,
• Magnets are distinguished by maximum magnetic induction on the surface,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Possibility of custom modeling and modifying to specific conditions,
• Huge importance in innovative solutions – they are used in magnetic memories, brushless drives, diagnostic systems, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in small systems

Cons of neodymium magnets: weaknesses and usage proposals

• At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage and increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Limited ability of creating threads in the magnet and complex shapes - preferred is casing - magnetic holder.
• Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child health protection. Furthermore, small components of these products are able to disrupt the diagnostic process medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what affects it?

The declared magnet strength concerns the maximum value, recorded under ideal test conditions, specifically:

• using a sheet made of mild steel, serving as a magnetic yoke
• possessing a thickness of at least 10 mm to avoid saturation
• with a plane cleaned and smooth
• without any air gap between the magnet and steel
• under perpendicular force direction (90-degree angle)
• in neutral thermal conditions

Determinants of lifting force in real conditions

Effective lifting capacity is influenced by specific conditions, such as (from priority):

• Air gap (betwixt the magnet and the plate), since even a microscopic clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, corrosion or dirt).
• Load vector – maximum parameter is obtained only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is standardly 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 penetrates through instead of converting into lifting capacity.
• Plate material – mild steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
• Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal weaken the grip.
• Thermal factor – hot environment reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under shearing force the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.