UMGGW 29x8 [M4] GW / N38 - magnetic holder rubber internal thread

Pros as well as cons of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their magnetic field is maintained, and after approximately 10 years it drops only by ~1% (according to research),
• They possess excellent resistance to magnetic field loss as a result of external fields,
• Thanks to the smooth finish, the surface of nickel, gold, or silver-plated gives an clean appearance,
• Neodymium magnets generate maximum magnetic induction on a small surface, which allows for strong attraction,
• Due to their durability and thermal resistance, neodymium magnets can operate (depending on the shape) even at high temperatures reaching 230°C or more...
• Possibility of custom creating and adapting to specific conditions,
• Versatile presence in innovative solutions – they serve a role in data components, electromotive mechanisms, medical equipment, also multitasking production systems.
• Compactness – despite small sizes they generate large force, 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 and increases the magnet's durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation and corrosion.
• Due to limitations in creating threads and complicated forms in magnets, we recommend using cover - magnetic mechanism.
• Potential hazard to health – tiny shards of magnets pose a threat, when accidentally swallowed, which becomes key in the context of child safety. It is also worth noting that small components of these magnets can be problematic in diagnostics medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is economically unviable,

Detachment force of the magnet in optimal conditions – what it depends on?

The load parameter shown concerns the limit force, measured under optimal environment, meaning:

• with the use of a yoke made of special test steel, guaranteeing full magnetic saturation
• whose thickness equals approx. 10 mm
• characterized by smoothness
• under conditions of no distance (metal-to-metal)
• for force applied at a right angle (in the magnet axis)
• in stable room temperature

Determinants of lifting force in real conditions

Real force impacted by working environment parameters, including (from most important):

• Space between magnet and steel – every millimeter of distance (caused e.g. by veneer or unevenness) diminishes the magnet efficiency, often by half at just 0.5 mm.
• Angle of force application – highest force is obtained only during perpendicular pulling. The shear force of the magnet along the plate is usually many times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field penetrates through instead of converting into lifting capacity.
• Material composition – not every steel reacts the same. High carbon content weaken the attraction effect.
• Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
• Operating temperature – NdFeB sinters have a negative temperature coefficient. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Holding force was measured on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, whereas under attempts to slide the magnet the holding force is lower. In addition, even a slight gap {between} the magnet and the plate lowers the lifting capacity.