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

Advantages as well as disadvantages of neodymium magnets.

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

• They retain magnetic properties for nearly ten years – the loss is just ~1% (according to analyses),
• Magnets perfectly resist against loss of magnetization caused by external fields,
• In other words, due to the shiny surface of gold, the element becomes visually attractive,
• Magnets have impressive magnetic induction on the outer side,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Due to the ability of precise molding and adaptation to individualized requirements, magnetic components can be produced in a variety of shapes and sizes, which makes them more universal,
• Versatile presence in electronics industry – they find application in data components, brushless drives, precision medical tools, also technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's 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.
• Magnets exposed to a humid environment can rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• We recommend cover - magnetic mechanism, due to difficulties in realizing nuts inside the magnet and complex shapes.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical after entering the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Maximum magnetic pulling force – what affects it?

Breakaway force is the result of a measurement for the most favorable conditions, including:

• on a block made of mild steel, perfectly concentrating the magnetic flux
• with a cross-section of at least 10 mm
• with a surface perfectly flat
• without the slightest insulating layer between the magnet and steel
• during pulling in a direction perpendicular to the plane
• at temperature approx. 20 degrees Celsius

Key elements affecting lifting force

In practice, the actual holding force is determined by a number of factors, listed from crucial:

• Distance (between the magnet and the metal), since even a tiny distance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
• Angle of force application – highest force is obtained only during perpendicular pulling. The force required to slide of the magnet along the plate is typically many times lower (approx. 1/5 of the lifting capacity).
• Metal thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of converting into lifting capacity.
• Steel grade – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
• Smoothness – ideal contact is obtained only on polished steel. Rough texture reduce the real contact area, reducing force.
• Thermal environment – temperature increase results in weakening of induction. Check the maximum operating temperature for a given model.

* Holding force was measured on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the lifting capacity is smaller. Additionally, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.