UMGZ 42x20x9 [M8] GZ / N38 - magnetic holder external thread

Strengths and weaknesses of rare earth magnets.

Apart from their strong holding force, neodymium magnets have these key benefits:

• They virtually do not lose power, because even after ten years the decline in efficiency is only ~1% (based on calculations),
• They feature excellent resistance to magnetism drop when exposed to external fields,
• In other words, due to the smooth finish of gold, the element looks attractive,
• The surface of neodymium magnets generates a unique magnetic field – this is a key feature,
• Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of accurate modeling as well as adjusting to precise conditions,
• Wide application in modern industrial fields – they serve a role in magnetic memories, brushless drives, diagnostic systems, as well as modern systems.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Characteristics of disadvantages of neodymium magnets: tips and applications.

• To avoid cracks under impact, we suggest using special steel holders. Such a solution secures the magnet and simultaneously increases its durability.
• 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Limited possibility of creating threads in the magnet and complicated forms - preferred is a housing - magnetic holder.
• Potential hazard to health – tiny shards of magnets can be dangerous, if swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these products can complicate diagnosis medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Breakaway strength of the magnet in ideal conditions – what affects it?

The load parameter shown concerns the peak performance, obtained under laboratory conditions, namely:

• with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
• whose transverse dimension equals approx. 10 mm
• with a plane perfectly flat
• under conditions of no distance (metal-to-metal)
• under vertical force direction (90-degree angle)
• at standard ambient temperature

Practical aspects of lifting capacity – factors

During everyday use, the actual lifting capacity is determined by many variables, ranked from most significant:

• Distance (betwixt the magnet and the metal), as even a microscopic distance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or debris).
• Force direction – declared lifting capacity refers to detachment vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of nominal force).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of generating force.
• Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
• Surface structure – the smoother and more polished the surface, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Temperature influence – high temperature 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 shearing force the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate decreases the load capacity.