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

Pros as well as cons of NdFeB magnets.

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

• They have constant strength, and over nearly ten years their attraction force decreases symbolically – ~1% (according to theory),
• They possess excellent resistance to magnetism drop as a result of external magnetic sources,
• By applying a shiny layer of nickel, the element has an modern look,
• The surface of neodymium magnets generates a strong magnetic field – this is a key feature,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to modularity in shaping and the ability to adapt to specific needs,
• Huge importance in advanced technology sectors – they serve a role in HDD drives, drive modules, diagnostic systems, and technologically advanced constructions.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in small systems

Characteristics of disadvantages of neodymium magnets and ways of using them

• To avoid cracks under impact, we recommend using special steel holders. Such a solution protects the magnet and simultaneously improves its durability.
• Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their force. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited ability of creating nuts in the magnet and complicated shapes - preferred is casing - magnet mounting.
• Health risk resulting from small fragments of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets can be problematic in diagnostics medical in case of swallowing.
• With large orders the cost of neodymium magnets is a challenge,

Detachment force of the magnet in optimal conditions – what it depends on?

Magnet power was defined for optimal configuration, including:

• using a base made of low-carbon steel, acting as a magnetic yoke
• possessing a massiveness of min. 10 mm to ensure full flux closure
• with an ideally smooth contact surface
• under conditions of ideal adhesion (metal-to-metal)
• for force acting at a right angle (pull-off, not shear)
• at temperature room level

Practical aspects of lifting capacity – factors

During everyday use, the actual lifting capacity results from a number of factors, listed from most significant:

• Clearance – existence of foreign body (paint, dirt, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to pulling vertically. When slipping, the magnet holds much less (often approx. 20-30% of nominal force).
• Steel thickness – too thin steel does not accept the full field, causing part of the flux to be wasted into the air.
• Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
• Surface condition – ground elements ensure maximum contact, which increases force. Uneven metal weaken the grip.
• Thermal environment – temperature increase causes a temporary drop of induction. Check the thermal limit for a given model.

* Lifting capacity testing was carried out on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet and the plate lowers the lifting capacity.