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

Pros as well as cons of neodymium magnets.

In addition to their long-term stability, neodymium magnets provide the following advantages:

• They do not lose strength, even during approximately 10 years – the decrease in power is only ~1% (theoretically),
• They maintain their magnetic properties even under external field action,
• The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• Neodymium magnets create maximum magnetic induction on a small area, which increases force concentration,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling operation at temperatures approaching 230°C and above...
• Thanks to versatility in designing and the capacity to modify to specific needs,
• Versatile presence in high-tech industry – they find application in hard drives, electric drive systems, advanced medical instruments, and technologically advanced constructions.
• Compactness – despite small sizes they generate large force, making them ideal for precision applications

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also improves 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 stability even at temperatures up to 230°C
• They oxidize in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complicated forms in magnets, we recommend using a housing - magnetic mount.
• Possible danger resulting from small fragments of magnets are risky, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to disrupt the diagnostic process medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is a challenge,

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

Magnet power was determined for optimal configuration, taking into account:

• using a sheet made of mild steel, serving as a ideal flux conductor
• possessing a massiveness of minimum 10 mm to ensure full flux closure
• characterized by smoothness
• without any air gap between the magnet and steel
• under axial application of breakaway force (90-degree angle)
• at room temperature

Lifting capacity in real conditions – factors

Bear in mind that the application force may be lower depending on the following factors, starting with the most relevant:

• Space between surfaces – every millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Pull-off angle – note that the magnet holds strongest perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Wall thickness – thin material does not allow full use of the magnet. Magnetic flux penetrates through instead of converting into lifting capacity.
• Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – smooth surfaces guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Heat – neodymium magnets have a negative temperature coefficient. At higher temperatures they lose power, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity was determined using a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under parallel forces the holding force is lower. In addition, even a slight gap {between} the magnet and the plate decreases the lifting capacity.