UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

Strengths as well as weaknesses of rare earth magnets.

Apart from their notable power, neodymium magnets have these key benefits:

• They retain full power for nearly 10 years – the drop is just ~1% (according to analyses),
• They maintain their magnetic properties even under strong external field,
• Thanks to the glossy finish, the plating of Ni-Cu-Ni, gold-plated, or silver-plated gives an elegant appearance,
• The surface of neodymium magnets generates a unique magnetic field – this is one of their assets,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and are able to act (depending on the shape) even at a temperature of 230°C or more...
• Considering the potential of free forming and adaptation to individualized solutions, neodymium magnets can be produced in a wide range of forms and dimensions, which expands the range of possible applications,
• Versatile presence in advanced technology sectors – they find application in data components, motor assemblies, advanced medical instruments, and other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Drawbacks and weaknesses of neodymium magnets: application proposals

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also increases its resistance to damage
• Neodymium magnets lose their strength under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating threads and complex forms in magnets, we propose using a housing - magnetic mount.
• Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Additionally, small components of these products can complicate diagnosis medical in case of swallowing.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting force for a neodymium magnet – what it depends on?

Holding force of 5.1 kg is a theoretical maximum value conducted under the following configuration:

• using a sheet made of mild steel, serving as a ideal flux conductor
• possessing a massiveness of at least 10 mm to ensure full flux closure
• characterized by smoothness
• with direct contact (without impurities)
• under perpendicular application of breakaway force (90-degree angle)
• at room temperature

Practical aspects of lifting capacity – factors

Real force impacted by working environment parameters, including (from priority):

• Clearance – the presence of any layer (rust, dirt, air) acts as an insulator, which lowers power rapidly (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When slipping, the magnet exhibits much less (typically approx. 20-30% of maximum force).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Chemical composition of the base – low-carbon steel gives the best results. Alloy steels reduce magnetic properties and holding force.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was measured by applying a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, in contrast under attempts to slide the magnet the holding force is lower. Additionally, even a slight gap {between} the magnet and the plate lowers the lifting capacity.