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

Strengths and weaknesses of neodymium magnets.

Besides their durability, neodymium magnets are valued for these benefits:

• They have constant strength, and over around ten years their performance decreases symbolically – ~1% (in testing),
• Magnets very well defend themselves against loss of magnetization caused by external fields,
• The use of an elegant coating of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Neodymium magnets deliver maximum magnetic induction on a their surface, which allows for strong attraction,
• 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...
• Considering the ability of precise molding and customization to specialized solutions, neodymium magnets can be modeled in a wide range of forms and dimensions, which increases their versatility,
• Fundamental importance in future technologies – they are used in data components, electric motors, precision medical tools, also complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, occupying minimum space,

Cons of neodymium magnets: tips and applications.

• Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a strong case, which not only secures them against impacts but also raises their durability
• Neodymium magnets decrease their strength 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 durability even at temperatures up to 230°C
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Limited possibility of making nuts in the magnet and complicated forms - preferred is cover - magnet mounting.
• Potential hazard resulting from small fragments of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these magnets are able to complicate diagnosis medical after entering the body.
• Due to neodymium price, their price is higher than average,

Maximum holding power of the magnet – what contributes to it?

The force parameter is a measurement result conducted under specific, ideal conditions:

• on a block made of mild steel, effectively closing the magnetic field
• whose transverse dimension is min. 10 mm
• with an ground touching surface
• with total lack of distance (no impurities)
• for force applied at a right angle (in the magnet axis)
• in neutral thermal conditions

Determinants of lifting force in real conditions

It is worth knowing that the working load may be lower influenced by elements below, in order of importance:

• Distance (betwixt the magnet and the plate), as even a microscopic clearance (e.g. 0.5 mm) can cause a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
• Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops drastically, often to levels of 20-30% of the nominal value.
• Element thickness – for full efficiency, the steel must be adequately massive. Paper-thin metal restricts the attraction force (the magnet "punches through" it).
• Chemical composition of the base – mild steel gives the best results. Alloy steels reduce magnetic permeability and lifting capacity.
• Surface condition – smooth surfaces ensure maximum contact, which improves field saturation. Rough surfaces reduce efficiency.
• Temperature – heating the magnet results in weakening of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under perpendicular forces, whereas under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate reduces the lifting capacity.