UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

Advantages as well as disadvantages of NdFeB magnets.

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

• Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (according to research),
• Neodymium magnets are remarkably resistant to magnetic field loss caused by external magnetic fields,
• Thanks to the smooth finish, the coating of Ni-Cu-Ni, gold, or silver gives an professional appearance,
• Magnetic induction on the top side of the magnet is very high,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Due to the option of flexible shaping and customization to custom projects, magnetic components can be created in a wide range of shapes and sizes, which makes them more universal,
• Universal use in modern industrial fields – they are commonly used in mass storage devices, motor assemblies, medical devices, also multitasking production systems.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material resistant to moisture, in case of application outdoors
• Due to limitations in producing nuts and complicated forms in magnets, we recommend using a housing - magnetic mount.
• Potential hazard related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small elements of these devices are able to disrupt the diagnostic process medical in case of swallowing.
• Due to complex production process, their price is higher than average,

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

Breakaway force is the result of a measurement for ideal contact conditions, including:

• with the contact of a sheet made of low-carbon steel, guaranteeing full magnetic saturation
• possessing a thickness of min. 10 mm to ensure full flux closure
• with a surface cleaned and smooth
• without any insulating layer between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

Bear in mind that the working load may be lower depending on elements below, starting with the most relevant:

• Gap between surfaces – every millimeter of distance (caused e.g. by varnish or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Load vector – highest force is available only during pulling at a 90° angle. The force required to slide of the magnet along the surface is standardly 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 passes through the material instead of generating force.
• Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases force. Uneven metal reduce efficiency.
• Thermal factor – high temperature reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Holding force was measured on the plate surface of 20 mm thickness, when the force acted perpendicularly, however under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate decreases the load capacity.