UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

Pros and cons of rare earth magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• They retain magnetic properties for almost ten years – the loss is just ~1% (based on simulations),
• Neodymium magnets prove to be exceptionally resistant to loss of magnetic properties caused by magnetic disturbances,
• By applying a smooth coating of nickel, the element has an proper look,
• Magnets possess maximum magnetic induction on the outer layer,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Thanks to the possibility of precise forming and adaptation to individualized requirements, NdFeB magnets can be produced in a variety of shapes and sizes, which amplifies use scope,
• Universal use in modern industrial fields – they are commonly used in mass storage devices, motor assemblies, diagnostic systems, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in small dimensions, which makes them useful in small systems

Disadvantages of NdFeB magnets:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• Neodymium magnets lose their power under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 230°C
• They oxidize in a humid environment. For use outdoors we advise using waterproof magnets e.g. in rubber, plastic
• Limited possibility of making threads in the magnet and complicated forms - preferred is casing - magnetic holder.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these products can complicate diagnosis medical when they are in the body.
• High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum holding power of the magnet – what contributes to it?

The force parameter is a result of laboratory testing executed under the following configuration:

• with the application of a yoke made of low-carbon steel, ensuring full magnetic saturation
• possessing a thickness of at least 10 mm to avoid saturation
• with a surface perfectly flat
• under conditions of ideal adhesion (surface-to-surface)
• during detachment in a direction perpendicular to the mounting surface
• at ambient temperature approx. 20 degrees Celsius

Impact of factors on magnetic holding capacity in practice

In real-world applications, the actual holding force depends on many variables, ranked from most significant:

• Distance – the presence of foreign body (rust, tape, gap) acts as an insulator, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds much less (often approx. 20-30% of nominal force).
• Steel thickness – insufficiently thick steel does not close the flux, causing part of the flux to be wasted into the air.
• Material composition – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – smooth surfaces ensure maximum contact, which increases field saturation. Rough surfaces weaken the grip.
• Operating temperature – neodymium magnets have a sensitivity to temperature. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was determined using a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under shearing force the lifting capacity is smaller. In addition, even a small distance {between} the magnet and the plate reduces the lifting capacity.