UMGGW 22x6 [M4] GW / N38 - magnetic holder rubber internal thread

Pros and cons of NdFeB magnets.

In addition to their magnetic efficiency, neodymium magnets provide the following advantages:

• They have unchanged lifting capacity, and over more than 10 years their attraction force decreases symbolically – ~1% (according to theory),
• They do not lose their magnetic properties even under close interference source,
• Thanks to the glossy finish, the plating of nickel, gold, or silver gives an visually attractive appearance,
• The surface of neodymium magnets generates a maximum magnetic field – this is one of their assets,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, enabling functioning at temperatures approaching 230°C and above...
• Possibility of accurate modeling and adjusting to individual requirements,
• Significant place in modern industrial fields – they find application in HDD drives, motor assemblies, diagnostic systems, also industrial machines.
• Thanks to efficiency per cm³, small magnets offer high operating force, occupying minimum space,

Characteristics of disadvantages of neodymium magnets: application proposals

• They are fragile upon heavy impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets suffer 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
• When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as those in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in creating threads and complicated forms in magnets, we recommend using a housing - magnetic holder.
• Possible danger to health – tiny shards of magnets are risky, in case of ingestion, which gains importance in the context of child health protection. Furthermore, tiny parts of these magnets can complicate diagnosis medical in case of swallowing.
• Due to complex production process, their price is relatively high,

Magnetic strength at its maximum – what affects it?

Breakaway force was defined for the most favorable conditions, including:

• with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
• possessing a thickness of at least 10 mm to ensure full flux closure
• characterized by even structure
• under conditions of gap-free contact (surface-to-surface)
• under vertical force vector (90-degree angle)
• at temperature approx. 20 degrees Celsius

Lifting capacity in real conditions – factors

Bear in mind that the magnet holding may be lower subject to elements below, starting with the most relevant:

• Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Element thickness – to utilize 100% power, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys reacts the same. High carbon content weaken the attraction effect.
• Plate texture – ground elements ensure maximum contact, which improves force. Uneven metal reduce efficiency.
• Thermal environment – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity testing was carried out on a smooth plate of suitable thickness, under perpendicular forces, in contrast under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Moreover, even a slight gap {between} the magnet and the plate reduces the load capacity.