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

Pros as well as cons of NdFeB magnets.

Apart from their superior holding force, neodymium magnets have these key benefits:

• They do not lose strength, even over around 10 years – the drop in lifting capacity is only ~1% (based on measurements),
• They maintain their magnetic properties even under strong external field,
• In other words, due to the aesthetic finish of gold, the element gains a professional look,
• Magnetic induction on the top side of the magnet is impressive,
• Due to their durability and thermal resistance, neodymium magnets are capable of operate (depending on the form) even at high temperatures reaching 230°C or more...
• Considering the option of accurate forming and customization to custom solutions, magnetic components can be produced in a variety of geometric configurations, which expands the range of possible applications,
• Significant place in modern industrial fields – they are utilized in magnetic memories, drive modules, precision medical tools, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in miniature devices

Cons of neodymium magnets and ways of using them

• To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously increases its 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material stable to moisture, when using outdoors
• We recommend cover - magnetic mount, due to difficulties in producing threads inside the magnet and complicated forms.
• Potential hazard related to microscopic parts of magnets pose a threat, when accidentally swallowed, which is particularly important in the aspect of protecting the youngest. It is also worth noting that tiny parts of these devices can complicate diagnosis medical in case of swallowing.
• 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?

Breakaway force was defined for ideal contact conditions, taking into account:

• using a base made of high-permeability steel, acting as a ideal flux conductor
• with a thickness minimum 10 mm
• with a surface perfectly flat
• under conditions of ideal adhesion (metal-to-metal)
• for force applied at a right angle (in the magnet axis)
• at temperature room level

Practical aspects of lifting capacity – factors

Please note that the magnet holding will differ influenced by the following factors, starting with the most relevant:

• Distance (between the magnet and the metal), since even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in lifting capacity by up to 50% (this also applies to varnish, rust or dirt).
• Pull-off angle – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the maximum value.
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
• Plate material – mild steel gives the best results. Higher carbon content reduce magnetic permeability and holding force.
• Surface finish – full contact is obtained only on smooth steel. Rough texture reduce the real contact area, weakening the magnet.
• Temperature influence – high temperature reduces pulling force. Too high temperature can permanently demagnetize the magnet.

* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under a perpendicular pulling force, in contrast under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a minimal clearance {between} the magnet and the plate reduces the holding force.