UMH 75x18x68 [M8] / N38 - magnetic holder with hook

Advantages as well as disadvantages of NdFeB magnets.

Besides their tremendous pulling force, neodymium magnets offer the following advantages:

• They do not lose power, even over nearly ten years – the drop in strength is only ~1% (according to tests),
• They feature excellent resistance to magnetism drop when exposed to external fields,
• The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
• Magnets exhibit maximum magnetic induction on the working surface,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to versatility in constructing and the ability to customize to unusual requirements,
• Versatile presence in modern technologies – they serve a role in hard drives, electric motors, diagnostic systems, and multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets lose their strength 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
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of creating threads in the magnet and complicated forms - preferred is casing - magnet mounting.
• Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small elements of these devices can complicate diagnosis medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what contributes to it?

The lifting capacity listed is a theoretical maximum value conducted under standard conditions:

• on a base made of mild steel, effectively closing the magnetic field
• possessing a thickness of at least 10 mm to avoid saturation
• characterized by even structure
• under conditions of ideal adhesion (surface-to-surface)
• under perpendicular force direction (90-degree angle)
• at standard ambient temperature

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity is determined by a number of factors, listed from most significant:

• Clearance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
• Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.

Advantages as well as disadvantages of NdFeB magnets.

Besides their tremendous pulling force, neodymium magnets offer the following advantages:

• They do not lose power, even over nearly ten years – the drop in strength is only ~1% (according to tests),
• They feature excellent resistance to magnetism drop when exposed to external fields,
• The use of an metallic layer of noble metals (nickel, gold, silver) causes the element to present itself better,
• Magnets exhibit maximum magnetic induction on the working surface,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Thanks to versatility in constructing and the ability to customize to unusual requirements,
• Versatile presence in modern technologies – they serve a role in hard drives, electric motors, diagnostic systems, and multitasking production systems.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• To avoid cracks upon strong impacts, we recommend using special steel housings. Such a solution secures the magnet and simultaneously improves its durability.
• Neodymium magnets lose their strength 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
• Magnets exposed to a humid environment can corrode. Therefore when using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
• Limited ability of creating threads in the magnet and complicated forms - preferred is casing - magnet mounting.
• Possible danger to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. Additionally, small elements of these devices can complicate diagnosis medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Magnetic strength at its maximum – what contributes to it?

The lifting capacity listed is a theoretical maximum value conducted under standard conditions:

• on a base made of mild steel, effectively closing the magnetic field
• possessing a thickness of at least 10 mm to avoid saturation
• characterized by even structure
• under conditions of ideal adhesion (surface-to-surface)
• under perpendicular force direction (90-degree angle)
• at standard ambient temperature

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity is determined by a number of factors, listed from most significant:

• Clearance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which lowers power steeply (even by 50% at 0.5 mm).
• Force direction – declared lifting capacity refers to detachment vertically. When attempting to slide, the magnet exhibits much less (often approx. 20-30% of maximum force).
• Substrate thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel attracts best. Alloy steels decrease magnetic permeability and lifting capacity.
• Smoothness – ideal contact is possible only on polished steel. Rough texture reduce the real contact area, reducing force.
• Operating temperature – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and in frost gain strength (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. Additionally, even a minimal clearance {between} the magnet’s surface and the plate decreases the holding force.