UMGGW 43x6 [M4] GW / N38 - magnetic holder rubber internal thread

Advantages as well as disadvantages of NdFeB magnets.

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

• They do not lose magnetism, even during approximately 10 years – the reduction in power is only ~1% (based on measurements),
• They do not lose their magnetic properties even under close interference source,
• In other words, due to the shiny surface of nickel, the element looks attractive,
• Magnetic induction on the surface of the magnet remains exceptional,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Thanks to versatility in designing and the capacity to customize to complex applications,
• Wide application in advanced technology sectors – they are utilized in magnetic memories, drive modules, diagnostic systems, as well as technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only shields the magnet but also improves its resistance to damage
• Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop of strength (a factor is the shape as well as dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• They oxidize in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing nuts and complicated forms in magnets, we propose using casing - magnetic holder.
• Health risk related to microscopic parts of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small elements of these products can disrupt the diagnostic process medical after entering the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

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

Information about lifting capacity was defined for ideal contact conditions, including:

• with the contact of a yoke made of low-carbon steel, ensuring full magnetic saturation
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• characterized by even structure
• without any insulating layer between the magnet and steel
• under vertical force direction (90-degree angle)
• at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

It is worth knowing that the magnet holding will differ depending on the following factors, starting with the most relevant:

• Space between surfaces – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Load vector – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is typically many 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 generating force.
• Plate material – mild steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
• Smoothness – ideal contact is possible only on polished steel. Rough texture create air cushions, reducing force.
• Operating temperature – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.