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

Strengths and weaknesses of NdFeB magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• Their magnetic field is durable, and after around ten years it drops only by ~1% (according to research),
• They possess excellent resistance to weakening of magnetic properties as a result of opposing magnetic fields,
• Thanks to the glossy finish, the layer of nickel, gold-plated, or silver-plated gives an professional appearance,
• Magnetic induction on the working part of the magnet is extremely intense,
• Thanks to resistance to high temperature, they are capable of working (depending on the shape) even at temperatures up to 230°C and higher...
• Possibility of precise machining and modifying to defined requirements,
• Significant place in modern industrial fields – they are commonly used in HDD drives, electric motors, medical equipment, and industrial machines.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

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

• At strong impacts they can break, therefore we advise placing them in steel cases. 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 force. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
• We suggest cover - magnetic mechanism, due to difficulties in producing threads inside the magnet and complex forms.
• Possible danger related to microscopic parts of magnets are risky, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets can complicate diagnosis medical when they are in the body.
• Due to complex production process, their price is relatively high,

Maximum lifting force for a neodymium magnet – what affects it?

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

• on a block made of structural steel, effectively closing the magnetic field
• whose transverse dimension reaches at least 10 mm
• with an ground touching surface
• with direct contact (without impurities)
• under axial application of breakaway force (90-degree angle)
• in temp. approx. 20°C

Practical aspects of lifting capacity – factors

During everyday use, the real power is determined by several key aspects, presented from crucial:

• Gap (between the magnet and the plate), because even a very small distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to paint, rust or dirt).
• Force direction – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (typically approx. 20-30% of maximum force).
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Plate material – mild steel attracts best. Alloy admixtures lower magnetic properties and holding force.
• Plate texture – ground elements guarantee perfect abutment, which increases force. Rough surfaces reduce efficiency.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under parallel forces the holding force is lower. In addition, even a small distance {between} the magnet and the plate decreases the lifting capacity.