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

Advantages and disadvantages of rare earth magnets.

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

• They have constant strength, and over more than 10 years their performance decreases symbolically – ~1% (in testing),
• They are resistant to demagnetization induced by external field influence,
• By using a decorative coating of silver, the element acquires an proper look,
• The surface of neodymium magnets generates a powerful magnetic field – this is a key feature,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Thanks to the potential of free forming and customization to specialized requirements, neodymium magnets can be created in a variety of shapes and sizes, which increases their versatility,
• Universal use in modern technologies – they are utilized in magnetic memories, electric drive systems, advanced medical instruments, and technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing threads and complicated shapes in magnets, we recommend using a housing - magnetic mount.
• Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small components of these products are able to disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Highest magnetic holding force – what contributes to it?

The load parameter shown represents the limit force, measured under optimal environment, namely:

• with the use of a sheet made of special test steel, ensuring maximum field concentration
• possessing a massiveness of min. 10 mm to avoid saturation
• with an ground touching surface
• under conditions of gap-free contact (surface-to-surface)
• during detachment in a direction vertical to the plane
• at ambient temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Please note that the magnet holding may be lower influenced by elements below, in order of importance:

• Distance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
• Load vector – maximum parameter is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically many times smaller (approx. 1/5 of the lifting capacity).
• Steel thickness – insufficiently thick plate causes magnetic saturation, causing part of the flux to be lost into the air.
• Plate material – mild steel attracts best. Alloy steels lower magnetic permeability and lifting capacity.
• Base smoothness – the more even the plate, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
• Thermal factor – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.