UMGZ 75x34x18 [M10] GZ / N38 - magnetic holder external thread

Pros as well as cons of NdFeB magnets.

Besides their tremendous field intensity, neodymium magnets offer the following advantages:

• Their strength remains stable, and after approximately ten years it decreases only by ~1% (according to research),
• They maintain their magnetic properties even under close interference source,
• A magnet with a metallic gold surface has an effective appearance,
• They are known for high magnetic induction at the operating surface, which affects their effectiveness,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of individual forming and optimizing to concrete conditions,
• Universal use in electronics industry – they find application in hard drives, electric drive systems, advanced medical instruments, and other advanced devices.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

Disadvantages of NdFeB magnets:

• To avoid cracks upon strong impacts, we suggest using special steel housings. Such a solution secures the magnet and simultaneously increases its durability.
• Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent weakening of strength (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
• Magnets exposed to a humid environment can corrode. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in creating threads and complex shapes in magnets, we recommend using casing - magnetic mount.
• Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child health protection. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical after entering the body.
• Due to expensive raw materials, their price is relatively high,

Maximum lifting capacity of the magnet – what affects it?

Breakaway force was determined for optimal configuration, including:

• with the contact of a yoke made of low-carbon steel, guaranteeing full magnetic saturation
• possessing a massiveness of at least 10 mm to avoid saturation
• characterized by lack of roughness
• without the slightest clearance between the magnet and steel
• under axial application of breakaway force (90-degree angle)
• at conditions approx. 20°C

Determinants of lifting force in real conditions

In real-world applications, the actual lifting capacity results from a number of factors, ranked from crucial:

• Air gap (betwixt the magnet and the plate), because even a very small distance (e.g. 0.5 mm) leads to a decrease in lifting capacity by up to 50% (this also applies to varnish, rust or debris).
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet exhibits much less (often approx. 20-30% of nominal force).
• Substrate thickness – for full efficiency, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Heat – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the holding force is lower. In addition, even a small distance {between} the magnet and the plate decreases the load capacity.