UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Advantages and disadvantages of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They have stable power, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
• Neodymium magnets are distinguished by extremely resistant to demagnetization caused by external interference,
• The use of an metallic coating of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• Magnetic induction on the surface of the magnet turns out to be extremely intense,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to freedom in forming and the ability to customize to unusual requirements,
• Huge importance in future technologies – they find application in computer drives, electromotive mechanisms, diagnostic systems, also technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in miniature devices

Disadvantages of neodymium magnets:

• At very 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.
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• Due to limitations in producing nuts and complicated forms in magnets, we propose using cover - magnetic mechanism.
• Health risk to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can be problematic in diagnostics medical when they are in the body.
• With mass production the cost of neodymium magnets is a challenge,

Maximum holding power of the magnet – what affects it?

Breakaway force is the result of a measurement for optimal configuration, taking into account:

• with the application of a yoke made of special test steel, guaranteeing full magnetic saturation
• whose thickness reaches at least 10 mm
• with an ideally smooth contact surface
• without the slightest clearance between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• in temp. approx. 20°C

Impact of factors on magnetic holding capacity in practice

Real force is influenced by specific conditions, mainly (from most important):

• Gap (betwixt the magnet and the metal), since even a very small distance (e.g. 0.5 mm) leads to a decrease in force by up to 50% (this also applies to paint, rust or debris).
• Direction of force – maximum parameter is obtained only during perpendicular pulling. The resistance to sliding of the magnet along the surface is standardly many times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Steel type – mild steel attracts best. Higher carbon content reduce magnetic properties and lifting capacity.
• Plate texture – ground elements ensure maximum contact, which improves force. Rough surfaces reduce efficiency.
• Temperature – temperature increase results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity was determined using a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular detachment force, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap {between} the magnet and the plate lowers the load capacity.