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

Pros as well as cons of rare earth magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They have stable power, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
• Magnets very well resist against demagnetization caused by foreign field sources,
• A magnet with a metallic silver surface is more attractive,
• They are known for high magnetic induction at the operating surface, which increases their power,
• 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 precise forming as well as adjusting to concrete conditions,
• Significant place in future technologies – they are commonly used in HDD drives, motor assemblies, diagnostic systems, and complex engineering applications.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Cons of neodymium magnets: application proposals

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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
• Due to limitations in creating threads and complicated forms in magnets, we recommend using cover - magnetic holder.
• Possible danger resulting from small fragments of magnets can be dangerous, in case of ingestion, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these products are able to complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what affects it?

The specified lifting capacity refers to the maximum value, measured under ideal test conditions, namely:

• using a sheet made of mild steel, functioning as a circuit closing element
• possessing a thickness of min. 10 mm to avoid saturation
• with an ground touching surface
• under conditions of gap-free contact (metal-to-metal)
• for force acting at a right angle (in the magnet axis)
• in stable room temperature

Determinants of practical lifting force of a magnet

It is worth knowing that the application force may be lower depending on elements below, in order of importance:

• Gap between surfaces – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the pulling force, often by half at just 0.5 mm.
• Direction of force – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the plate is typically several times smaller (approx. 1/5 of the lifting capacity).
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Steel type – mild steel attracts best. Higher carbon content decrease magnetic properties and lifting capacity.
• Surface finish – ideal contact is possible only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
• Temperature influence – hot environment weakens magnetic field. Too high temperature can permanently damage the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under perpendicular forces, whereas under shearing force the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance {between} the magnet’s surface and the plate lowers the lifting capacity.