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

Pros and cons of neodymium magnets.

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

• They do not lose magnetism, even during nearly 10 years – the decrease in lifting capacity is only ~1% (according to tests),
• They do not lose their magnetic properties even under strong external field,
• In other words, due to the glossy finish of silver, the element looks attractive,
• They show high magnetic induction at the operating surface, which improves attraction properties,
• Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and are able to act (depending on the form) even at a temperature of 230°C or more...
• Due to the ability of free shaping and customization to individualized solutions, magnetic components can be produced in a wide range of forms and dimensions, which expands the range of possible applications,
• Significant place in high-tech industry – they are used in computer drives, electric drive systems, diagnostic systems, also other advanced devices.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Cons of neodymium magnets and ways of using them

• Brittleness is one of their disadvantages. Upon intense impact they can fracture. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets experience a drop in strength. Often, when the temperature exceeds 80°C, their power decreases (depending on the size and shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• They oxidize in a humid environment - during use outdoors we suggest using waterproof magnets e.g. in rubber, plastic
• Due to limitations in producing threads and complex shapes in magnets, we recommend using cover - magnetic holder.
• Health risk to health – tiny shards 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 elements of these devices can be problematic in diagnostics medical when they are in the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum holding power of the magnet – what affects it?

The force parameter is a result of laboratory testing executed under specific, ideal conditions:

• with the contact of a sheet made of special test steel, guaranteeing maximum field concentration
• whose transverse dimension equals approx. 10 mm
• with an ground contact surface
• with direct contact (without paint)
• during detachment in a direction vertical to the plane
• at temperature approx. 20 degrees Celsius

Practical aspects of lifting capacity – factors

During everyday use, the actual lifting capacity is determined by several key aspects, listed from crucial:

• Clearance – the presence of foreign body (paint, dirt, gap) acts as an insulator, which reduces power steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet holds strongest perpendicularly. Under shear forces, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Steel thickness – too thin steel causes magnetic saturation, causing part of the flux to be wasted into the air.
• Material composition – different alloys attracts identically. High carbon content worsen the interaction with the magnet.
• Surface condition – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
• Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, however under shearing force the load capacity is reduced by as much as 75%. Moreover, even a small distance {between} the magnet and the plate reduces the holding force.