UMGGZ 66x8.5 [M8] GZ / N38 - rubber magnetic holder external thread

Advantages and disadvantages of neodymium magnets.

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

• They retain attractive force for nearly 10 years – the drop is just ~1% (according to analyses),
• They possess excellent resistance to magnetic field loss due to external magnetic sources,
• Thanks to the shiny finish, the layer of nickel, gold, or silver gives an elegant appearance,
• Neodymium magnets deliver maximum magnetic induction on a contact point, which increases force concentration,
• 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 exact machining as well as adjusting to precise needs,
• Significant place in advanced technology sectors – they serve a role in data components, motor assemblies, medical equipment, and other advanced devices.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Drawbacks and weaknesses of neodymium magnets: weaknesses and usage proposals

• At very strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets experience a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They rust in a humid environment - during use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic mount, due to difficulties in producing threads inside the magnet and complex forms.
• Potential hazard resulting from small fragments of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. It is also worth noting that small components of these products are able to disrupt the diagnostic process medical when they are in the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

Best holding force of the magnet in ideal parameters – what it depends on?

The lifting capacity listed is a theoretical maximum value conducted under standard conditions:

• using a base made of high-permeability steel, functioning as a circuit closing element
• possessing a thickness of at least 10 mm to avoid saturation
• with a surface cleaned and smooth
• without the slightest air gap between the magnet and steel
• for force acting at a right angle (pull-off, not shear)
• at standard ambient temperature

Key elements affecting lifting force

In practice, the actual lifting capacity is determined by several key aspects, presented from crucial:

• Clearance – existence of foreign body (rust, dirt, gap) interrupts the magnetic circuit, which reduces power steeply (even by 50% at 0.5 mm).
• Load vector – maximum parameter is reached only during perpendicular pulling. The resistance to sliding of the magnet along the surface is usually several times smaller (approx. 1/5 of the lifting capacity).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the attraction force (the magnet "punches through" it).
• Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic properties and lifting capacity.
• Surface quality – the more even the plate, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Heat – neodymium magnets have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).

* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, however under shearing force the load capacity is reduced by as much as fivefold. Additionally, even a minimal clearance {between} the magnet and the plate decreases the load capacity.