UMGW 60x30x15 [M10] GW / N38 - magnetic holder internal thread

Pros as well as cons of neodymium magnets.

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

• They retain magnetic properties for nearly ten years – the loss is just ~1% (in theory),
• They are resistant to demagnetization induced by external magnetic fields,
• The use of an refined finish of noble metals (nickel, gold, silver) causes the element to look better,
• Magnets exhibit exceptionally strong magnetic induction on the working surface,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Possibility of exact forming as well as adapting to complex needs,
• Key role in electronics industry – they find application in magnetic memories, brushless drives, advanced medical instruments, and technologically advanced constructions.
• Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,

Disadvantages of neodymium magnets:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth protecting magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
• 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 durability 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, in case of application outdoors
• Due to limitations in producing nuts and complicated shapes in magnets, we recommend using cover - magnetic mechanism.
• Potential hazard resulting from small fragments of magnets can be dangerous, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, small elements of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• Due to neodymium price, their price is relatively high,

Maximum holding power of the magnet – what it depends on?

The load parameter shown concerns the peak performance, obtained under optimal environment, namely:

• with the use of a sheet made of special test steel, guaranteeing maximum field concentration
• possessing a massiveness of at least 10 mm to avoid saturation
• with an ideally smooth touching surface
• with zero gap (without paint)
• for force applied at a right angle (in the magnet axis)
• at ambient temperature approx. 20 degrees Celsius

Practical lifting capacity: influencing factors

In real-world applications, the real power depends on several key aspects, listed from the most important:

• Distance – the presence of any layer (rust, tape, gap) acts as an insulator, which reduces power rapidly (even by 50% at 0.5 mm).
• Load vector – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux passes through the material instead of generating force.
• Steel type – mild steel gives the best results. Alloy steels lower magnetic permeability and holding force.
• Surface quality – the smoother and more polished the plate, the better the adhesion and higher the lifting capacity. Roughness creates an air distance.
• Temperature – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.

* Lifting capacity was measured with the use of a smooth steel plate of suitable thickness (min. 20 mm), under perpendicular detachment force, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a minimal clearance {between} the magnet and the plate reduces the load capacity.