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

Pros and cons of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They virtually do not lose strength, because even after ten years the decline in efficiency is only ~1% (according to literature),
• Magnets effectively protect themselves against demagnetization caused by external fields,
• By using a reflective coating of gold, the element acquires an modern look,
• They are known for high magnetic induction at the operating surface, which increases their power,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
• Thanks to the ability of accurate shaping and customization to specialized requirements, neodymium magnets can be created in a wide range of geometric configurations, which increases their versatility,
• Fundamental importance in modern technologies – they are used in magnetic memories, brushless drives, precision medical tools, and industrial machines.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

What to avoid - cons of neodymium magnets and proposals for their use:

• At very strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as 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 strength 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
• They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating nuts and complex forms in magnets, we propose using a housing - magnetic holder.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that tiny parts of these products are able to be problematic in diagnostics medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what contributes to it?

Information about lifting capacity is the result of a measurement for ideal contact conditions, assuming:

• using a plate made of high-permeability steel, acting as a circuit closing element
• possessing a massiveness of min. 10 mm to avoid saturation
• with a surface free of scratches
• under conditions of no distance (metal-to-metal)
• under axial force vector (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity is determined by a number of factors, listed from most significant:

• Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Base massiveness – too thin sheet does not accept the full field, causing part of the flux to be escaped to the other side.
• Metal type – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
• Surface finish – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate lowers the lifting capacity.