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

Advantages as well as disadvantages of rare earth magnets.

Besides their tremendous strength, neodymium magnets offer the following advantages:

• They do not lose magnetism, even after around ten years – the drop in power is only ~1% (theoretically),
• They feature excellent resistance to magnetism drop as a result of external fields,
• In other words, due to the aesthetic layer of gold, the element gains visual value,
• Magnetic induction on the top side of the magnet remains maximum,
• Thanks to resistance to high temperature, they are able to function (depending on the form) even at temperatures up to 230°C and higher...
• Possibility of custom forming as well as adjusting to specific requirements,
• Versatile presence in innovative solutions – they serve a role in data components, electric motors, precision medical tools, also modern systems.
• Thanks to their power density, small magnets offer high operating force, with minimal size,

Disadvantages of NdFeB magnets:

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also increases their durability
• When exposed to high temperature, neodymium magnets experience a drop in force. 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
• When exposed to humidity, magnets usually rust. To use them in conditions outside, it is recommended to use protective magnets, such as those in rubber or plastics, which prevent oxidation as well as corrosion.
• Due to limitations in realizing nuts and complex shapes in magnets, we recommend using casing - magnetic mechanism.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to be problematic in diagnostics medical after entering the body.
• Due to complex production process, their price is relatively high,

Optimal lifting capacity of a neodymium magnet – what it depends on?

The specified lifting capacity refers to the peak performance, recorded under optimal environment, meaning:

• on a block made of structural steel, effectively closing the magnetic field
• possessing a thickness of at least 10 mm to avoid saturation
• characterized by lack of roughness
• under conditions of gap-free contact (metal-to-metal)
• for force applied at a right angle (in the magnet axis)
• at room temperature

Determinants of lifting force in real conditions

It is worth knowing that the magnet holding may be lower depending on the following factors, starting with the most relevant:

• Distance – existence of any layer (paint, dirt, air) acts as an insulator, which lowers capacity steeply (even by 50% at 0.5 mm).
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the nominal value.
• Metal thickness – the thinner the sheet, the weaker the hold. Part of the magnetic field passes through the material instead of converting into lifting capacity.
• Metal type – not every steel attracts identically. Alloy additives worsen the attraction effect.
• Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, in contrast under shearing force the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate decreases the holding force.