UMH 20x7x35 [M4] / N38 - magnetic holder with hook

Pros as well as cons of NdFeB magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• Their strength is maintained, and after around 10 years it drops only by ~1% (according to research),
• Magnets very well defend themselves against demagnetization caused by foreign field sources,
• Thanks to the elegant finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
• Magnets are characterized by very high magnetic induction on the active area,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to freedom in designing and the capacity to customize to individual projects,
• Wide application in advanced technology sectors – they are commonly used in hard drives, motor assemblies, medical devices, and complex engineering applications.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons of neodymium magnets: application proposals

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• 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.
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Limited possibility of making nuts in the magnet and complicated shapes - preferred is casing - mounting mechanism.
• Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting capacity of the magnet – what contributes to it?

The load parameter shown refers to the limit force, measured under laboratory conditions, meaning:

• with the use of a yoke made of special test steel, ensuring maximum field concentration
• possessing a massiveness of minimum 10 mm to avoid saturation
• with an ideally smooth touching surface
• without the slightest insulating layer between the magnet and steel
• during pulling in a direction perpendicular to the plane
• at ambient temperature room level

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity depends on many variables, listed from crucial:

• Clearance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
• Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.

Pros as well as cons of NdFeB magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• Their strength is maintained, and after around 10 years it drops only by ~1% (according to research),
• Magnets very well defend themselves against demagnetization caused by foreign field sources,
• Thanks to the elegant finish, the coating of nickel, gold-plated, or silver gives an professional appearance,
• Magnets are characterized by very high magnetic induction on the active area,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Thanks to freedom in designing and the capacity to customize to individual projects,
• Wide application in advanced technology sectors – they are commonly used in hard drives, motor assemblies, medical devices, and complex engineering applications.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

Cons of neodymium magnets: application proposals

• They are fragile upon heavy impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• 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.
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material stable to moisture, in case of application outdoors
• Limited possibility of making nuts in the magnet and complicated shapes - preferred is casing - mounting mechanism.
• Possible danger to health – tiny shards of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these devices can disrupt the diagnostic process medical in case of swallowing.
• High unit price – neodymium magnets have a higher price than other types of magnets (e.g. ferrite), which increases costs of application in large quantities

Maximum lifting capacity of the magnet – what contributes to it?

The load parameter shown refers to the limit force, measured under laboratory conditions, meaning:

• with the use of a yoke made of special test steel, ensuring maximum field concentration
• possessing a massiveness of minimum 10 mm to avoid saturation
• with an ideally smooth touching surface
• without the slightest insulating layer between the magnet and steel
• during pulling in a direction perpendicular to the plane
• at ambient temperature room level

Practical lifting capacity: influencing factors

In practice, the actual lifting capacity depends on many variables, listed from crucial:

• Clearance – existence of any layer (paint, tape, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
• Force direction – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the maximum value.
• Wall thickness – the thinner the sheet, the weaker the hold. Magnetic flux penetrates through instead of converting into lifting capacity.
• Steel type – low-carbon steel gives the best results. Higher carbon content decrease magnetic properties and holding force.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
• Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, whereas under attempts to slide the magnet the load capacity is reduced by as much as 75%. Moreover, even a slight gap {between} the magnet’s surface and the plate lowers the load capacity.