UMGZ 25x17x8 [M5] GZ / N38 - magnetic holder external thread

Advantages and disadvantages of rare earth magnets.

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

• They have constant strength, and over nearly ten years their performance decreases symbolically – ~1% (in testing),
• They possess excellent resistance to weakening of magnetic properties due to external fields,
• By covering with a lustrous layer of nickel, the element gains an modern look,
• Neodymium magnets ensure maximum magnetic induction on a their surface, which ensures high operational effectiveness,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their form) at temperatures up to 230°C and above...
• Possibility of precise machining as well as adjusting to concrete requirements,
• Universal use in electronics industry – they are commonly used in mass storage devices, electromotive mechanisms, diagnostic systems, as well as complex engineering applications.
• Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,

Disadvantages of neodymium magnets:

• They are fragile upon too strong impacts. To avoid cracks, it is worth protecting magnets in a protective case. Such protection not only shields the magnet but also increases its resistance to damage
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we suggest our specialized [AH] magnets, which work effectively even at 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 immune to moisture, in case of application outdoors
• We recommend cover - magnetic holder, due to difficulties in realizing threads inside the magnet and complicated shapes.
• Possible danger related to microscopic parts of magnets pose a threat, in case of ingestion, which becomes key in the context of child safety. Furthermore, small elements of these products can complicate diagnosis medical after entering the body.
• With large orders the cost of neodymium magnets is economically unviable,

Maximum magnetic pulling force – what it depends on?

The force parameter is a result of laboratory testing conducted under the following configuration:

• on a base made of structural steel, optimally conducting the magnetic flux
• whose thickness is min. 10 mm
• with an ground contact surface
• with total lack of distance (without impurities)
• during detachment in a direction perpendicular to the mounting surface
• at ambient temperature room level

Practical lifting capacity: influencing factors

In real-world applications, the actual lifting capacity is determined by many variables, listed from most significant:

• Gap between surfaces – even a fraction of a millimeter of distance (caused e.g. by veneer or unevenness) significantly weakens the pulling force, often by half at just 0.5 mm.
• Pull-off angle – remember that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops significantly, often to levels of 20-30% of the nominal value.
• Steel thickness – insufficiently thick sheet does not accept the full field, causing part of the flux to be escaped into the air.
• Plate material – low-carbon steel attracts best. Alloy admixtures reduce magnetic properties and holding force.
• Plate texture – smooth surfaces guarantee perfect abutment, which improves force. Rough surfaces reduce efficiency.
• Temperature influence – hot environment reduces pulling force. Exceeding the limit temperature can permanently damage the magnet.

* Lifting capacity was assessed using a polished steel plate of optimal thickness (min. 20 mm), under perpendicular pulling force, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet and the plate lowers the holding force.