UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread

Strengths and weaknesses of NdFeB magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They retain full power for nearly 10 years – the loss is just ~1% (in theory),
• Magnets perfectly resist against loss of magnetization caused by foreign field sources,
• By applying a lustrous coating of gold, the element acquires an modern look,
• The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
• 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...
• In view of the option of precise forming and customization to custom requirements, magnetic components can be created in a broad palette of forms and dimensions, which makes them more universal,
• Key role in modern technologies – they are utilized in mass storage devices, motor assemblies, medical devices, and multitasking production systems.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their power 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 advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing threads and complex forms in magnets, we propose using cover - magnetic mount.
• Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child safety. Furthermore, small components of these products can disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what contributes to it?

The specified lifting capacity represents the maximum value, measured under optimal environment, namely:

• on a plate made of mild steel, effectively closing the magnetic field
• possessing a massiveness of min. 10 mm to ensure full flux closure
• characterized by smoothness
• under conditions of gap-free contact (metal-to-metal)
• during pulling in a direction vertical to the mounting surface
• at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

During everyday use, the real power results from several key aspects, ranked from most significant:

• Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (often approx. 20-30% of maximum force).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Material type – ideal substrate is high-permeability steel. Stainless steels may attract less.
• Surface structure – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Thermal environment – temperature increase causes a temporary drop of force. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was performed on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a small distance {between} the magnet and the plate lowers the holding force.