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

Pros as well as cons of NdFeB magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They do not lose power, even over around 10 years – the reduction in lifting capacity is only ~1% (according to tests),
• They maintain their magnetic properties even under strong external field,
• By covering with a reflective layer of silver, the element presents an professional look,
• They feature high magnetic induction at the operating surface, which affects their effectiveness,
• 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 versatility in designing and the capacity to customize to unusual requirements,
• Wide application in modern industrial fields – they find application in hard drives, electric motors, precision medical tools, and complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which enables their usage in compact constructions

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution protects the magnet and simultaneously increases its durability.
• 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
• Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in realizing nuts and complicated forms in magnets, we recommend using a housing - magnetic mount.
• Possible danger to health – tiny shards of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small elements of these products are able to disrupt the diagnostic process medical after entering the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Breakaway strength of the magnet in ideal conditions – what affects it?

The declared magnet strength concerns the limit force, obtained under ideal test conditions, specifically:

• with the use of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• possessing a massiveness of at least 10 mm to ensure full flux closure
• with an ideally smooth touching surface
• under conditions of ideal adhesion (metal-to-metal)
• during detachment in a direction vertical to the plane
• at temperature room level

What influences lifting capacity in practice

Real force is influenced by working environment parameters, including (from priority):

• Distance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Angle of force application – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically many times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Material composition – different alloys attracts identically. Alloy additives worsen the attraction effect.
• Smoothness – ideal contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
• Thermal environment – heating the magnet results in weakening of induction. Check the maximum operating temperature for a given model.

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under perpendicular forces, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Additionally, even a minimal clearance {between} the magnet and the plate decreases the load capacity.