UMH 42x9x46 [M6] / N38 - magnetic holder with hook

Strengths as well as weaknesses of neodymium magnets.

Besides their exceptional strength, neodymium magnets offer the following advantages:

• They have unchanged lifting capacity, and over more than ten years their attraction force decreases symbolically – ~1% (according to theory),
• They have excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
• In other words, due to the metallic layer of nickel, the element looks attractive,
• Magnets are characterized by excellent magnetic induction on the outer layer,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures approaching 230°C and above...
• Possibility of accurate shaping and optimizing to concrete needs,
• Fundamental importance in modern technologies – they are commonly used in mass storage devices, electric motors, medical devices, and modern systems.
• Thanks to concentrated force, small magnets offer high operating force, occupying minimum space,

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we suggest using special steel holders. Such a solution protects 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 force. 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 recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Due to limitations in producing threads and complex forms in magnets, we propose using casing - magnetic holder.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets can disrupt the diagnostic process medical after entering the body.
• Due to neodymium price, their price exceeds standard values,

Highest magnetic holding force – what affects it?

The load parameter shown concerns the peak performance, measured under ideal test conditions, namely:

• with the contact of a yoke made of special test steel, guaranteeing maximum field concentration
• whose thickness equals approx. 10 mm
• with an polished touching surface
• with zero gap (no paint)
• during detachment in a direction vertical to the plane
• at ambient temperature room level

Magnet lifting force in use – key factors

Real force is affected by specific conditions, mainly (from priority):

• Distance – existence of any layer (paint, tape, gap) interrupts the magnetic circuit, which reduces power rapidly (even by 50% at 0.5 mm).
• Loading method – catalog parameter refers to detachment vertically. When applying parallel force, the magnet holds much less (often approx. 20-30% of maximum force).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys attracts identically. High carbon content weaken the attraction effect.
• Smoothness – ideal contact is possible only on smooth steel. Rough texture create air cushions, weakening the magnet.
• Thermal conditions – neodymium magnets have a sensitivity to temperature. At higher temperatures they lose power, and in frost gain strength (up to a certain limit).

* Lifting capacity was assessed by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under vertically applied force, whereas under shearing force the lifting capacity is smaller. Moreover, even a slight gap {between} the magnet and the plate reduces the holding force.