MW 15x8 / N38 - cylindrical magnet

Pros as well as cons of neodymium magnets.

Apart from their consistent power, neodymium magnets have these key benefits:

• They do not lose magnetism, even during nearly 10 years – the decrease in lifting capacity is only ~1% (based on measurements),
• Magnets perfectly defend themselves against loss of magnetization caused by foreign field sources,
• Thanks to the glossy finish, the layer of Ni-Cu-Ni, gold, or silver-plated gives an professional appearance,
• The surface of neodymium magnets generates a strong magnetic field – this is a distinguishing feature,
• They are suitable for high-temperature applications, operating effectively at 230°C+ due to advanced heat resistance and form-specific properties,
• Thanks to the option of accurate molding and adaptation to individualized requirements, neodymium magnets can be modeled in a broad palette of shapes and sizes, which amplifies use scope,
• Versatile presence in future technologies – they find application in magnetic memories, drive modules, advanced medical instruments, also modern systems.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we recommend placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in realizing nuts and complex shapes in magnets, we propose using a housing - magnetic mount.
• Health risk resulting from small fragments of magnets can be dangerous, in case of ingestion, which becomes key in the context of child health protection. Additionally, small elements of these products can disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what affects it?

Holding force of 6.64 kg is a result of laboratory testing conducted under the following configuration:

• on a base made of mild steel, perfectly concentrating the magnetic flux
• possessing a massiveness of min. 10 mm to ensure full flux closure
• with an polished contact surface
• under conditions of gap-free contact (metal-to-metal)
• under axial force direction (90-degree angle)
• at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity depends on a number of factors, listed from crucial:

• 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 – declared lifting capacity refers to pulling vertically. When applying parallel force, the magnet exhibits significantly lower power (typically approx. 20-30% of nominal force).
• Substrate thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Material type – the best choice is high-permeability steel. Stainless steels may attract less.
• Surface finish – full contact is possible only on smooth steel. Rough texture reduce the real contact area, reducing force.
• Heat – neodymium magnets have a negative temperature coefficient. When it is hot they lose power, and in frost they can be stronger (up to a certain limit).

* Lifting capacity was determined with the use of a polished steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a slight gap {between} the magnet and the plate decreases the load capacity.