UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

Pros as well as cons of NdFeB magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They retain full power for almost 10 years – the drop is just ~1% (based on simulations),
• Neodymium magnets remain exceptionally resistant to loss of magnetic properties caused by external interference,
• A magnet with a smooth nickel surface has an effective appearance,
• Magnets possess very high magnetic induction on the outer layer,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Considering the possibility of flexible molding and customization to specialized requirements, NdFeB magnets can be manufactured in a variety of shapes and sizes, which increases their versatility,
• Huge importance in innovative solutions – they find application in computer drives, drive modules, diagnostic systems, and modern systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in small dimensions, which makes them useful in compact constructions

Characteristics of disadvantages of neodymium magnets: weaknesses and usage proposals

• Susceptibility to cracking is one of their disadvantages. Upon intense impact they can break. We recommend keeping them in a special holder, which not only secures them against impacts but also increases their durability
• 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
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
• We suggest a housing - magnetic mount, due to difficulties in creating nuts inside the magnet and complicated shapes.
• Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, 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.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which can limit application in large quantities

Optimal lifting capacity of a neodymium magnet – what it depends on?

The force parameter is a result of laboratory testing performed under specific, ideal conditions:

• using a sheet made of low-carbon steel, serving as a magnetic yoke
• with a cross-section minimum 10 mm
• characterized by smoothness
• with direct contact (no coatings)
• under vertical force vector (90-degree angle)
• at standard ambient temperature

Magnet lifting force in use – key factors

It is worth knowing that the application force may be lower subject to the following factors, in order of importance:

• Air gap (betwixt the magnet and the plate), because even a tiny clearance (e.g. 0.5 mm) results in a reduction in force by up to 50% (this also applies to varnish, rust or dirt).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Material type – the best choice is high-permeability steel. Hardened steels may generate lower lifting capacity.
• Smoothness – ideal contact is obtained only on polished steel. Any scratches and bumps create air cushions, weakening the magnet.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently damage the magnet.

* 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. In addition, even a minimal clearance {between} the magnet and the plate decreases the lifting capacity.