UMGW 36x18x8 [M8] GW / N38 - magnetic holder internal thread

Advantages as well as disadvantages of NdFeB magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They have constant strength, and over around ten years their performance decreases symbolically – ~1% (in testing),
• They possess excellent resistance to magnetism drop as a result of external magnetic sources,
• The use of an aesthetic coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Magnets possess maximum magnetic induction on the active area,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to flexibility in designing and the capacity to modify to individual projects,
• Key role in future technologies – they serve a role in data components, brushless drives, diagnostic systems, also technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in small dimensions, which makes them useful in miniature devices

Characteristics of disadvantages of neodymium magnets: tips and applications.

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets experience 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
• They rust in a humid environment. For use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated forms.
• Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which gains importance in the context of child safety. Furthermore, small elements of these devices can be problematic in diagnostics medical when they are in the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Maximum lifting capacity of the magnet – what affects it?

The declared magnet strength refers to the maximum value, measured under laboratory conditions, meaning:

• using a base made of high-permeability steel, functioning as a magnetic yoke
• whose thickness equals approx. 10 mm
• characterized by even structure
• under conditions of ideal adhesion (surface-to-surface)
• under vertical force direction (90-degree angle)
• at room temperature

Determinants of practical lifting force of a magnet

During everyday use, the real power is determined by several key aspects, ranked from the most important:

• Distance – the presence of foreign body (paint, dirt, air) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
• Direction of force – highest force is reached only during pulling at a 90° angle. The force required to slide of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
• Plate thickness – insufficiently thick steel does not accept the full field, causing part of the flux to be escaped into the air.
• Material type – ideal substrate is high-permeability steel. Cast iron may generate lower lifting capacity.
• Surface finish – full contact is obtained only on smooth steel. Rough texture create air cushions, weakening the magnet.
• Temperature – heating the magnet results in weakening of induction. Check the thermal limit for a given model.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. In addition, even a minimal clearance {between} the magnet’s surface and the plate decreases the lifting capacity.