UMGGW 34x8 [M4] GW / N38 - magnetic holder rubber internal thread

Strengths as well as weaknesses of neodymium magnets.

Besides their stability, neodymium magnets are valued for these benefits:

• They retain full power for almost ten years – the drop is just ~1% (according to analyses),
• They show high resistance to demagnetization induced by external magnetic fields,
• In other words, due to the smooth finish of silver, the element looks attractive,
• Magnetic induction on the top side of the magnet is exceptional,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
• Thanks to freedom in designing and the capacity to customize to client solutions,
• Universal use in modern technologies – they serve a role in hard drives, drive modules, diagnostic systems, also multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer strong magnetic field in compact dimensions, which makes them useful in compact constructions

Cons of neodymium magnets: application proposals

• At strong impacts they can break, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• When exposed to high temperature, neodymium magnets suffer a drop in strength. Often, when the temperature exceeds 80°C, their power 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
• Limited possibility of making threads in the magnet and complicated forms - preferred is casing - magnetic holder.
• Possible danger related to microscopic parts of magnets pose a threat, if swallowed, which is particularly important in the context of child safety. Furthermore, small components of these products are able to complicate diagnosis medical after entering the body.
• With budget limitations the cost of neodymium magnets is a challenge,

Highest magnetic holding force – what contributes to it?

Breakaway force was determined for ideal contact conditions, including:

• with the application of a sheet made of special test steel, guaranteeing maximum field concentration
• whose transverse dimension reaches at least 10 mm
• with an ground touching surface
• without the slightest clearance between the magnet and steel
• during pulling in a direction vertical to the plane
• at ambient temperature room level

Determinants of practical lifting force of a magnet

Effective lifting capacity impacted by specific conditions, including (from priority):

• Distance – the presence of any layer (rust, dirt, gap) acts as an insulator, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – remember that the magnet has greatest strength perpendicularly. Under shear forces, the capacity drops significantly, often to levels of 20-30% of the maximum value.
• Plate thickness – too thin plate does not accept the full field, causing part of the power to be wasted to the other side.
• Material type – ideal substrate is pure iron steel. Stainless steels may generate lower lifting capacity.
• Surface quality – the smoother and more polished the plate, the larger the contact zone and stronger the hold. Unevenness acts like micro-gaps.
• Temperature – heating the magnet results in weakening of induction. It is worth remembering the maximum operating temperature for a given model.

* Lifting capacity was measured by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under vertically applied force, whereas under attempts to slide the magnet the lifting capacity is smaller. Additionally, even a small distance {between} the magnet and the plate lowers the holding force.