UMGGW 88x8.5 [M6] GW / N38 - magnetic holder rubber internal thread

Pros as well as cons of NdFeB magnets.

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

• They do not lose power, even after approximately 10 years – the reduction in lifting capacity is only ~1% (according to tests),
• They do not lose their magnetic properties even under close interference source,
• A magnet with a smooth nickel surface is more attractive,
• Neodymium magnets deliver maximum magnetic induction on a contact point, which allows for strong attraction,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Thanks to modularity in shaping and the ability to modify to unusual requirements,
• Versatile presence in innovative solutions – they are utilized in data components, electromotive mechanisms, advanced medical instruments, as well as other advanced devices.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

What to avoid - cons of neodymium magnets and ways of using them

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a steel housing, which not only protects them against impacts but also increases their durability
• Neodymium magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of power (a factor is the shape and dimensions of the magnet). We offer magnets specially adapted to work at temperatures up to 230°C marked [AH], which are extremely resistant to heat
• 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
• We recommend a housing - magnetic holder, due to difficulties in producing nuts inside the magnet and complex shapes.
• Health risk resulting from small fragments of magnets are risky, if swallowed, which becomes key in the context of child safety. Additionally, small elements of these products are able to complicate diagnosis medical in case of swallowing.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Best holding force of the magnet in ideal parameters – what contributes to it?

The load parameter shown concerns the maximum value, obtained under ideal test conditions, namely:

• using a base made of mild steel, acting as a ideal flux conductor
• whose thickness equals approx. 10 mm
• characterized by lack of roughness
• without the slightest insulating layer between the magnet and steel
• during detachment in a direction vertical to the mounting surface
• at standard ambient temperature

Impact of factors on magnetic holding capacity in practice

In practice, the actual lifting capacity results from a number of factors, presented from most significant:

• Clearance – existence of any layer (paint, dirt, air) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet exhibits significantly lower power (often approx. 20-30% of maximum force).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Steel type – low-carbon steel attracts best. Higher carbon content lower magnetic permeability and holding force.
• Plate texture – smooth surfaces ensure maximum contact, which improves field saturation. Uneven metal reduce efficiency.
• Operating temperature – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and at low temperatures they can be stronger (up to a certain limit).

* Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a slight gap {between} the magnet and the plate decreases the holding force.