HH 16x5.3 [M3] / N38 - through hole magnetic holder

Pros as well as cons of NdFeB magnets.

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

• Their magnetic field is durable, and after around ten years it drops only by ~1% (according to research),
• Neodymium magnets prove to be highly resistant to loss of magnetic properties caused by external field sources,
• By applying a smooth coating of gold, the element presents an modern look,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• 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...
• Possibility of accurate shaping as well as adjusting to complex requirements,
• Fundamental importance in advanced technology sectors – they serve a role in data components, drive modules, diagnostic systems, as well as technologically advanced constructions.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• Neodymium magnets decrease 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
• 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, when using outdoors
• Limited possibility of making nuts in the magnet and complex shapes - preferred is cover - magnetic holder.
• Potential hazard to health – tiny shards of magnets can be dangerous, when accidentally swallowed, which gains importance in the context of child safety. Furthermore, small components of these products are able to be problematic in diagnostics medical after entering the body.
• Due to expensive raw materials, their price exceeds standard values,

Maximum magnetic pulling force – what contributes to it?

Holding force of 4 kg is a measurement result executed under specific, ideal conditions:

• on a block made of structural steel, optimally conducting the magnetic field
• with a thickness minimum 10 mm
• characterized by even structure
• with zero gap (without coatings)
• under vertical force vector (90-degree angle)
• at conditions approx. 20°C

Determinants of practical lifting force of a magnet

In practice, the actual lifting capacity is determined by many variables, ranked from the most important:

• Gap (betwixt the magnet and the plate), because even a microscopic clearance (e.g. 0.5 mm) can cause a drastic drop in lifting capacity by up to 50% (this also applies to varnish, corrosion or dirt).
• Force direction – note that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Plate material – mild steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, weakening the magnet.
• Temperature – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.

* Lifting capacity was determined with the use of a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.