UMGW 48x24x11.5 [M8] GW / N38 - magnetic holder internal thread

Strengths as well as weaknesses of neodymium magnets.

Besides their exceptional field intensity, neodymium magnets offer the following advantages:

• They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
• Magnets very well defend themselves against loss of magnetization caused by foreign field sources,
• In other words, due to the shiny layer of nickel, the element looks attractive,
• The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• Thanks to freedom in forming and the ability to customize to individual projects,
• Key role in electronics industry – they are used in data components, electric drive systems, advanced medical instruments, and multitasking production systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

What to avoid - cons of neodymium magnets: tips and applications.

• At strong impacts they can crack, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
• Health risk to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which becomes key in the context of child health protection. Furthermore, small elements of these products are able to be problematic in diagnostics medical in case of swallowing.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what affects it?

The specified lifting capacity represents the maximum value, obtained under optimal environment, namely:

• with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
• possessing a thickness of minimum 10 mm to avoid saturation
• characterized by smoothness
• with zero gap (no coatings)
• under axial application of breakaway force (90-degree angle)
• in neutral thermal conditions

What influences lifting capacity in practice

Effective lifting capacity is influenced by working environment parameters, mainly (from most important):

• Distance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Direction of force – maximum parameter is obtained only during perpendicular pulling. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys attracts identically. High carbon content weaken the interaction with the magnet.
• Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, reducing force.
• Thermal environment – heating the magnet causes a temporary drop of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate reduces the lifting capacity.