UMGGZ 88x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Advantages as well as disadvantages of NdFeB magnets.

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

• They do not lose power, even after approximately ten years – the drop in lifting capacity is only ~1% (based on measurements),
• Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
• A magnet with a smooth nickel surface is more attractive,
• They show high magnetic induction at the operating surface, which affects their effectiveness,
• 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 possibility of flexible forming and customization to specialized requirements, neodymium magnets can be manufactured in a broad palette of geometric configurations, which increases their versatility,
• Universal use in future technologies – they are utilized in magnetic memories, electric motors, advanced medical instruments, and modern systems.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which enables their usage in compact constructions

Drawbacks and weaknesses of neodymium magnets: tips and applications.

• They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• When exposed to high temperature, neodymium magnets experience a drop in strength. 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
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation and corrosion.
• Due to limitations in creating threads and complex forms in magnets, we propose using casing - magnetic mechanism.
• Potential hazard to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child safety. It is also worth noting that small components of these products can disrupt the diagnostic process medical after entering the body.
• Due to neodymium price, their price exceeds standard values,

Maximum magnetic pulling force – what it depends on?

Holding force of 42.9 kg is a result of laboratory testing executed under specific, ideal conditions:

• with the contact of a sheet made of low-carbon steel, guaranteeing maximum field concentration
• possessing a thickness of minimum 10 mm to avoid saturation
• with an polished contact surface
• without the slightest clearance between the magnet and steel
• under vertical force direction (90-degree angle)
• at standard ambient temperature

Determinants of lifting force in real conditions

Bear in mind that the application force may be lower influenced by elements below, in order of importance:

• Gap between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Angle of force application – maximum parameter is obtained only during pulling at a 90° angle. The shear force of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
• Surface quality – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal factor – high temperature reduces magnetic field. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was measured by applying a polished steel plate of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. In addition, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.