UMGW 75x33x18 [M10] GW / N38 - magnetic holder internal thread

Pros as well as cons of neodymium magnets.

Besides their immense pulling force, neodymium magnets offer the following advantages:

• They retain attractive force for nearly 10 years – the drop is just ~1% (based on simulations),
• They are noted for resistance to demagnetization induced by external disturbances,
• The use of an shiny finish of noble metals (nickel, gold, silver) causes the element to be more visually attractive,
• Magnetic induction on the working layer of the magnet turns out to be very high,
• Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for functioning at temperatures reaching 230°C and above...
• Possibility of detailed shaping as well as adapting to specific requirements,
• Key role in modern technologies – they find application in data components, electric motors, diagnostic systems, as well as complex engineering applications.
• Relatively small size with high pulling force – neodymium magnets offer high power in tiny dimensions, which allows their use in miniature devices

Disadvantages of NdFeB magnets:

• At strong impacts they can crack, therefore we advise placing them in special holders. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• Due to the susceptibility of magnets to corrosion in a humid environment, we suggest using waterproof magnets made of rubber, plastic or other material immune to moisture, when using outdoors
• Due to limitations in realizing threads and complicated shapes in magnets, we propose using casing - magnetic mechanism.
• Potential hazard resulting from small fragments of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child safety. It is also worth noting that small components of these products can be problematic in diagnostics medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is economically unviable,

Maximum magnetic pulling force – what it depends on?

Information about lifting capacity is the result of a measurement for optimal configuration, assuming:

• on a base made of structural steel, effectively closing the magnetic flux
• with a cross-section minimum 10 mm
• characterized by even structure
• without the slightest clearance between the magnet and steel
• for force applied at a right angle (in the magnet axis)
• in stable room temperature

Magnet lifting force in use – key factors

Real force impacted by working environment parameters, such as (from priority):

• Clearance – existence of foreign body (paint, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds much less (typically approx. 20-30% of maximum force).
• Plate thickness – insufficiently thick steel does not close the flux, causing part of the power to be lost to the other side.
• Material composition – different alloys reacts the same. High carbon content worsen the interaction with the magnet.
• Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Roughness acts like micro-gaps.
• Thermal factor – hot environment reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the load capacity is reduced by as much as 5 times. In addition, even a small distance {between} the magnet’s surface and the plate reduces the load capacity.