UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

Advantages and disadvantages of neodymium magnets.

Apart from their strong magnetic energy, neodymium magnets have these key benefits:

• They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (according to literature),
• They are resistant to demagnetization induced by external disturbances,
• A magnet with a metallic gold surface has better aesthetics,
• Magnetic induction on the top side of the magnet is impressive,
• Thanks to resistance to high temperature, they are able to function (depending on the shape) even at temperatures up to 230°C and higher...
• In view of the possibility of precise molding and adaptation to specialized needs, magnetic components can be produced in a broad palette of geometric configurations, which amplifies use scope,
• Versatile presence in innovative solutions – they find application in HDD drives, drive modules, diagnostic systems, and other advanced devices.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which makes them useful in small systems

Cons of neodymium magnets and proposals for their use:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
• NdFeB magnets demagnetize when exposed to high temperatures. After reaching 80°C, many of them experience permanent drop 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 very resistant to heat
• They oxidize in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Due to limitations in creating threads and complex shapes in magnets, we propose using cover - magnetic holder.
• Health risk to health – tiny shards of magnets are risky, when accidentally swallowed, which is particularly important in the context of child safety. Furthermore, small elements of these products can complicate diagnosis medical when they are in the body.
• Due to expensive raw materials, their price exceeds standard values,

Optimal lifting capacity of a neodymium magnet – what affects it?

Breakaway force is the result of a measurement for optimal configuration, assuming:

• using a plate made of high-permeability steel, acting as a circuit closing element
• with a thickness of at least 10 mm
• characterized by smoothness
• with zero gap (without paint)
• under perpendicular application of breakaway force (90-degree angle)
• in stable room temperature

Magnet lifting force in use – key factors

In practice, the actual lifting capacity depends on many variables, presented from the most important:

• Clearance – the presence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Material composition – different alloys attracts identically. Alloy additives weaken the interaction with the magnet.
• Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
• Thermal factor – hot environment weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity was measured using a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the lifting capacity is smaller. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the holding force.