UMGW 75x33x18 [M10] GW / N38 - magnetic holder internal thread

Strengths as well as weaknesses of neodymium magnets.

In addition to their magnetic capacity, neodymium magnets provide the following advantages:

• They do not lose power, even after approximately ten years – the decrease in lifting capacity is only ~1% (according to tests),
• They possess excellent resistance to magnetic field loss due to external fields,
• Thanks to the metallic finish, the surface of Ni-Cu-Ni, gold-plated, or silver-plated gives an modern appearance,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the shape) even at a temperature of 230°C or more...
• Thanks to versatility in forming and the capacity to customize to client solutions,
• Fundamental importance in electronics industry – they serve a role in mass storage devices, brushless drives, diagnostic systems, and industrial machines.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. 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 strength. 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
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in realizing threads and complicated forms in magnets, we propose using casing - magnetic mechanism.
• Health risk related to microscopic parts of magnets can be dangerous, if swallowed, which becomes key in the aspect of protecting the youngest. It is also worth noting that 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

Maximum lifting capacity of the magnet – what affects it?

Holding force of 162.00 kg is a result of laboratory testing conducted under standard conditions:

• on a plate made of structural steel, perfectly concentrating the magnetic field
• possessing a massiveness of min. 10 mm to avoid saturation
• characterized by smoothness
• under conditions of ideal adhesion (metal-to-metal)
• under perpendicular application of breakaway force (90-degree angle)
• at ambient temperature room level

Determinants of practical lifting force of a magnet

Please note that the application force may be lower influenced by the following factors, starting with the most relevant:

• Distance – existence of any layer (rust, dirt, air) acts as an insulator, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – highest force is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is typically several times smaller (approx. 1/5 of the lifting capacity).
• Base massiveness – insufficiently thick sheet does not accept the full field, causing part of the flux to be lost into the air.
• Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic properties and lifting capacity.
• Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
• Thermal conditions – NdFeB sinters have a sensitivity to temperature. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was assessed using a smooth steel plate of suitable thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a small distance {between} the magnet’s surface and the plate reduces the lifting capacity.