UMGZ 20x15x7 [M4] GZ / N38 - magnetic holder external thread

Strengths as well as weaknesses of rare earth magnets.

Besides their immense magnetic power, neodymium magnets offer the following advantages:

• They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (according to theory),
• They possess excellent resistance to weakening of magnetic properties when exposed to opposing magnetic fields,
• By using a decorative coating of nickel, the element gains an modern look,
• Magnets are distinguished by excellent magnetic induction on the surface,
• Through (appropriate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
• Thanks to the option of precise forming and adaptation to custom requirements, magnetic components can be created in a variety of forms and dimensions, which expands the range of possible applications,
• Universal use in modern technologies – they are used in magnetic memories, electromotive mechanisms, diagnostic systems, and complex engineering applications.
• Thanks to their power density, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• To avoid cracks under impact, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• They rust in a humid environment. For use outdoors we recommend using waterproof magnets e.g. in rubber, plastic
• We recommend casing - magnetic mount, due to difficulties in producing nuts inside the magnet and complicated forms.
• Possible danger related to microscopic parts of magnets can be dangerous, in case of ingestion, which becomes key in the context of child safety. Additionally, tiny parts of these magnets can disrupt the diagnostic process medical after entering the body.
• Due to complex production process, their price is relatively high,

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

Holding force of 9 kg is a measurement result executed under the following configuration:

• on a block made of mild steel, optimally conducting the magnetic field
• with a cross-section minimum 10 mm
• characterized by lack of roughness
• with direct contact (no impurities)
• under perpendicular application of breakaway force (90-degree angle)
• in neutral thermal conditions

Lifting capacity in real conditions – factors

Please note that the working load will differ subject to elements below, in order of importance:

• Distance (between the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) results in a drastic drop in force by up to 50% (this also applies to paint, corrosion or dirt).
• Force direction – remember that the magnet holds strongest perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
• Base massiveness – too thin plate causes magnetic saturation, causing part of the flux to be lost to the other side.
• Chemical composition of the base – low-carbon steel attracts best. Higher carbon content decrease magnetic permeability and holding force.
• Surface quality – the more even the surface, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
• Thermal environment – heating the magnet causes a temporary drop of force. Check the maximum operating temperature for a given model.

* Lifting capacity was measured using a smooth steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet’s surface and the plate decreases the holding force.