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

Strengths and weaknesses of neodymium magnets.

Besides their immense magnetic power, neodymium magnets offer the following advantages:

• They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
• Neodymium magnets are exceptionally resistant to loss of magnetic properties caused by external interference,
• In other words, due to the reflective surface of silver, the element becomes visually attractive,
• Magnetic induction on the working part of the magnet turns out to be exceptional,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to versatility in designing and the capacity to modify to complex applications,
• Key role in modern industrial fields – they are utilized in computer drives, motor assemblies, medical equipment, also modern systems.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Characteristics of disadvantages of neodymium magnets and ways of using them

• At strong impacts they can crack, 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 suffer 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
• Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in creating nuts and complicated forms in magnets, we propose using a housing - magnetic mount.
• Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical when they are in 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

Maximum lifting force for a neodymium magnet – what contributes to it?

The lifting capacity listed is a theoretical maximum value performed under the following configuration:

• using a sheet made of mild steel, functioning as a ideal flux conductor
• whose transverse dimension equals approx. 10 mm
• with an ground touching surface
• without the slightest clearance between the magnet and steel
• during pulling in a direction vertical to the mounting surface
• at conditions approx. 20°C

Magnet lifting force in use – key factors

Real force is influenced by working environment parameters, mainly (from priority):

• Air gap (betwixt the magnet and the metal), as even a very small clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
• Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
• Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Material composition – different alloys reacts the same. High carbon content worsen the attraction effect.
• Surface quality – the smoother and more polished the plate, the better the adhesion and stronger the hold. Unevenness acts like micro-gaps.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was carried out on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. Moreover, even a small distance {between} the magnet’s surface and the plate lowers the holding force.