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

Pros and cons of rare earth magnets.

Apart from their notable magnetism, neodymium magnets have these key benefits:

• They virtually do not lose power, because even after 10 years the decline in efficiency is only ~1% (according to literature),
• Neodymium magnets are distinguished by highly resistant to loss of magnetic properties caused by external magnetic fields,
• In other words, due to the reflective surface of nickel, the element becomes visually attractive,
• They are known for high magnetic induction at the operating surface, which affects their effectiveness,
• 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...
• Possibility of precise shaping as well as adapting to atypical applications,
• Key role in modern technologies – they serve a role in mass storage devices, electric motors, precision medical tools, also other advanced devices.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of neodymium magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We recommend keeping them in a special holder, which not only protects them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Due to limitations in realizing threads and complex forms in magnets, we propose using casing - magnetic holder.
• Potential hazard to health – tiny shards of magnets pose a threat, in case of ingestion, which is particularly important in the context of child safety. It is also worth noting that small components of these magnets are able to complicate diagnosis medical after entering the body.
• High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities

Maximum magnetic pulling force – what it depends on?

Information about lifting capacity is the result of a measurement for the most favorable conditions, assuming:

• with the contact of a yoke made of low-carbon steel, ensuring maximum field concentration
• whose thickness equals approx. 10 mm
• with a plane perfectly flat
• without the slightest clearance between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• at ambient temperature approx. 20 degrees Celsius

What influences lifting capacity in practice

Bear in mind that the application force will differ subject to the following factors, in order of importance:

• Distance (between the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a drastic drop in force by up to 50% (this also applies to varnish, rust or debris).
• Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the lifting capacity (the magnet "punches through" it).
• Steel grade – the best choice is pure iron steel. Cast iron may attract less.
• Surface quality – the more even the plate, the better the adhesion and higher the lifting capacity. Unevenness acts like micro-gaps.
• Temperature – heating the magnet results in weakening of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, however under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet’s surface and the plate reduces the holding force.