UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

Pros as well as cons of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They do not lose strength, even over around 10 years – the reduction in power is only ~1% (theoretically),
• Magnets effectively resist against demagnetization caused by ambient magnetic noise,
• In other words, due to the metallic surface of nickel, the element looks attractive,
• Magnets are distinguished by impressive magnetic induction on the working 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...
• Considering the option of precise shaping and adaptation to unique solutions, NdFeB magnets can be manufactured in a wide range of shapes and sizes, which makes them more universal,
• Key role in modern industrial fields – they are used in hard drives, electromotive mechanisms, medical equipment, also multitasking production systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At very strong impacts they can break, therefore we recommend placing them in special holders. A metal housing provides additional protection against damage and increases the magnet's durability.
• When exposed to high temperature, neodymium magnets experience a drop in force. Often, when the temperature exceeds 80°C, their power 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 suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• Limited possibility of creating nuts in the magnet and complicated forms - recommended is casing - magnetic holder.
• Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child health protection. Additionally, small components of these devices can disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

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

Magnet power was defined for optimal configuration, taking into account:

• with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• possessing a massiveness of minimum 10 mm to avoid saturation
• with a surface free of scratches
• with direct contact (no paint)
• under perpendicular application of breakaway force (90-degree angle)
• in neutral thermal conditions

What influences lifting capacity in practice

Bear in mind that the application force will differ subject to elements below, starting with the most relevant:

• Gap (betwixt the magnet and the metal), as even a tiny distance (e.g. 0.5 mm) results in a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Load vector – maximum parameter is reached only during pulling at a 90° angle. The force required to slide of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick sheet does not close the flux, causing part of the flux to be wasted into the air.
• Steel type – mild steel attracts best. Higher carbon content reduce magnetic properties and holding force.
• Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
• Temperature influence – high temperature reduces magnetic field. Too high temperature can permanently damage the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, whereas under parallel forces the load capacity is reduced by as much as fivefold. Moreover, even a small distance {between} the magnet and the plate reduces the load capacity.