UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread

Advantages and disadvantages of neodymium magnets.

Apart from their consistent holding force, neodymium magnets have these key benefits:

• Their magnetic field is maintained, and after approximately ten years it decreases only by ~1% (theoretically),
• They do not lose their magnetic properties even under strong external field,
• By applying a decorative layer of silver, the element has an proper look,
• Neodymium magnets create maximum magnetic induction on a small area, which increases force concentration,
• Neodymium magnets are characterized by very high magnetic induction on the magnet surface and can function (depending on the form) even at a temperature of 230°C or more...
• Possibility of individual creating and adapting to complex conditions,
• Huge importance in future technologies – they are utilized in hard drives, electric motors, advanced medical instruments, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in tiny dimensions, which makes them useful in small systems

Disadvantages of neodymium magnets:

• They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets suffer a drop in force. Often, when the temperature exceeds 80°C, their strength 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Limited possibility of making threads in the magnet and complex forms - recommended is casing - mounting mechanism.
• Potential hazard related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, small components of these magnets can complicate diagnosis medical in case of swallowing.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Optimal lifting capacity of a neodymium magnet – what affects it?

Holding force of 80 kg is a result of laboratory testing conducted under specific, ideal conditions:

• using a base made of mild steel, acting as a circuit closing element
• whose thickness reaches at least 10 mm
• with an polished touching surface
• with zero gap (no impurities)
• for force acting at a right angle (pull-off, not shear)
• in temp. approx. 20°C

Determinants of practical lifting force of a magnet

In practice, the real power is determined by several key aspects, listed from crucial:

• Space between surfaces – every millimeter of separation (caused e.g. by varnish or dirt) diminishes the pulling force, often by half at just 0.5 mm.
• Loading method – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
• Steel thickness – insufficiently thick steel causes magnetic saturation, causing part of the power to be lost to the other side.
• Steel type – mild steel attracts best. Alloy steels lower magnetic properties and holding force.
• Plate texture – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Operating temperature – neodymium magnets have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular pulling force, in contrast under parallel forces the holding force is lower. Additionally, even a small distance {between} the magnet and the plate reduces the lifting capacity.