UMGGZ 22x6 [M4] GZ / N38 - rubber magnetic holder external thread

Strengths and weaknesses of neodymium magnets.

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

• They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (in laboratory conditions),
• Neodymium magnets remain exceptionally resistant to loss of magnetic properties caused by external interference,
• The use of an shiny layer of noble metals (nickel, gold, silver) causes the element to have aesthetics,
• They are known for high magnetic induction at the operating surface, which increases their power,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for functioning at temperatures reaching 230°C and above...
• Possibility of detailed machining and adapting to atypical requirements,
• Huge importance in future technologies – they are utilized in data components, motor assemblies, precision medical tools, also complex engineering applications.
• Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications

Disadvantages of NdFeB magnets:

• Susceptibility to cracking is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, which not only secures them against impacts but also raises their durability
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their strength 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
• 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 secure oxidation as well as corrosion.
• Due to limitations in realizing nuts and complex forms in magnets, we propose using casing - magnetic holder.
• Health risk resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets can complicate diagnosis medical after entering the body.
• Higher cost of purchase is a significant factor to consider compared to ceramic magnets, especially in budget applications

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

The declared magnet strength refers to the limit force, recorded under laboratory conditions, namely:

• using a base made of low-carbon steel, functioning as a circuit closing element
• whose thickness is min. 10 mm
• with a surface perfectly flat
• under conditions of gap-free contact (metal-to-metal)
• 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 elements below, in order of importance:

• Space between magnet and steel – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) significantly weakens the magnet efficiency, often by half at just 0.5 mm.
• Angle of force application – highest force is available only during pulling at a 90° angle. The shear force of the magnet along the surface is usually many times lower (approx. 1/5 of the lifting capacity).
• Wall thickness – thin material does not allow full use of the magnet. Part of the magnetic field passes through the material instead of generating force.
• Metal type – not every steel reacts the same. Alloy additives worsen the interaction with the magnet.
• Surface condition – ground elements ensure maximum contact, which increases field saturation. Uneven metal reduce efficiency.
• Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was checked on the plate surface of 20 mm thickness, when a perpendicular force was applied, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a minimal clearance {between} the magnet and the plate decreases the load capacity.