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

Pros and cons of neodymium magnets.

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

• Their magnetic field remains stable, and after approximately 10 years it drops only by ~1% (theoretically),
• They possess excellent resistance to magnetic field loss when exposed to external fields,
• The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to present itself better,
• Magnetic induction on the working part of the magnet is impressive,
• 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 forming and the capacity to customize to individual projects,
• Universal use in modern industrial fields – they are commonly used in magnetic memories, motor assemblies, medical devices, and technologically advanced constructions.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Cons of neodymium magnets and proposals for their use:

• To avoid cracks under impact, we suggest using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets lose strength when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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
• They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited possibility of producing nuts in the magnet and complex forms - preferred is casing - magnet mounting.
• Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which gains importance in the aspect of protecting the youngest. Additionally, small components of these magnets are able to be problematic in diagnostics medical when they are in the body.
• With budget limitations the cost of neodymium magnets can be a barrier,

Magnetic strength at its maximum – what contributes to it?

The specified lifting capacity concerns the maximum value, measured under optimal environment, specifically:

• with the contact of a sheet made of special test steel, guaranteeing full magnetic saturation
• with a thickness no less than 10 mm
• with a plane cleaned and smooth
• under conditions of ideal adhesion (metal-to-metal)
• during detachment in a direction vertical to the plane
• at room temperature

Lifting capacity in real conditions – factors

In practice, the real power results from a number of factors, listed from crucial:

• Clearance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Steel thickness – too thin sheet does not accept the full field, causing part of the power to be wasted into the air.
• Material type – the best choice is pure iron steel. Stainless steels may have worse magnetic properties.
• Surface structure – the more even the surface, the better the adhesion and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature influence – hot environment reduces pulling force. Too high temperature can permanently damage the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap {between} the magnet and the plate reduces the holding force.