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

Advantages and disadvantages of neodymium magnets.

In addition to their pulling strength, neodymium magnets provide the following advantages:

• They virtually do not lose strength, because even after 10 years the decline in efficiency is only ~1% (according to literature),
• Neodymium magnets prove to be exceptionally resistant to magnetic field loss caused by external interference,
• In other words, due to the reflective layer of nickel, the element is aesthetically pleasing,
• Magnetic induction on the working layer of the magnet turns out to be impressive,
• Neodymium magnets are characterized by very 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...
• Thanks to the potential of free forming and customization to unique solutions, NdFeB magnets can be manufactured in a broad palette of shapes and sizes, which expands the range of possible applications,
• Versatile presence in modern technologies – they find application in computer drives, electric motors, medical devices, also modern systems.
• Relatively small size with high pulling force – neodymium magnets offer impressive pulling force in compact dimensions, which makes them useful in miniature devices

Cons of neodymium magnets and proposals for their use:

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only shields the magnet but also improves its resistance to damage
• 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
• Due to the susceptibility of magnets to corrosion in a humid environment, we advise using waterproof magnets made of rubber, plastic or other material resistant to moisture, when using outdoors
• We suggest cover - magnetic mount, due to difficulties in realizing nuts inside the magnet and complicated forms.
• Potential hazard related to microscopic parts of magnets are risky, in case of ingestion, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these devices 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?

Holding force of 5.1 kg is a measurement result performed under standard conditions:

• on a block made of mild steel, perfectly concentrating the magnetic field
• possessing a thickness of min. 10 mm to ensure full flux closure
• with an ground contact surface
• with direct contact (no paint)
• under axial application of breakaway force (90-degree angle)
• at ambient temperature room level

Key elements affecting lifting force

It is worth knowing that the working load will differ depending on the following factors, in order of importance:

• Gap (between the magnet and the metal), as 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, corrosion or dirt).
• Angle of force application – highest force is reached only during pulling at a 90° angle. The resistance to sliding of the magnet along the plate is usually several times lower (approx. 1/5 of the lifting capacity).
• Base massiveness – insufficiently thick plate does not accept the full field, causing part of the power to be wasted into the air.
• Steel grade – ideal substrate is pure iron steel. Hardened steels may attract less.
• Surface condition – smooth surfaces ensure maximum contact, which increases force. Rough surfaces weaken the grip.
• Thermal environment – heating the magnet causes a temporary drop of force. It is worth remembering the thermal limit for a given model.

* Lifting capacity testing was performed on plates with a smooth surface of suitable thickness, under a perpendicular pulling force, whereas under parallel forces the lifting capacity is smaller. In addition, even a slight gap {between} the magnet’s surface and the plate lowers the holding force.