UMS 16x6.5x3.5x5 / N38 - conical magnetic holder

Pros as well as cons of neodymium magnets.

Besides their exceptional field intensity, neodymium magnets offer the following advantages:

• They have constant strength, and over more than ten years their performance decreases symbolically – ~1% (according to theory),
• They retain their magnetic properties even under strong external field,
• By applying a lustrous layer of silver, the element presents an professional look,
• Magnetic induction on the working part of the magnet remains exceptional,
• Through (adequate) combination of ingredients, they can achieve high thermal strength, enabling functioning at temperatures reaching 230°C and above...
• Due to the ability of flexible molding and customization to individualized requirements, neodymium magnets can be produced in a broad palette of geometric configurations, which increases their versatility,
• Universal use in modern technologies – they serve a role in hard drives, electromotive mechanisms, advanced medical instruments, and industrial machines.
• Compactness – despite small sizes they provide effective action, making them ideal for precision applications

Characteristics of disadvantages of neodymium magnets and proposals for their use:

• Brittleness is one of their disadvantages. Upon intense impact they can break. We advise keeping them in a steel housing, which not only secures them against impacts but also raises their durability
• We warn that neodymium magnets can reduce their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
• When exposed to humidity, magnets start to rust. To use them in conditions outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which secure oxidation as well as corrosion.
• Due to limitations in realizing threads and complex forms in magnets, we recommend using a housing - magnetic mechanism.
• Possible danger to health – tiny shards of magnets are risky, if swallowed, which is particularly important in the aspect of protecting the youngest. Additionally, tiny parts of these magnets are able to complicate diagnosis medical when they are in the body.
• Due to complex production process, their price is higher than average,

Maximum magnetic pulling force – what it depends on?

The force parameter is a result of laboratory testing conducted under standard conditions:

• with the application of a yoke made of special test steel, guaranteeing maximum field concentration
• with a thickness of at least 10 mm
• with a surface free of scratches
• without any air gap between the magnet and steel
• during detachment in a direction perpendicular to the mounting surface
• at standard ambient temperature

Lifting capacity in practice – influencing factors

Real force impacted by specific conditions, mainly (from priority):

• Space between magnet and steel – every millimeter of separation (caused e.g. by varnish or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
• Loading method – declared lifting capacity refers to pulling vertically. When slipping, the magnet exhibits much less (often approx. 20-30% of nominal force).
• Substrate thickness – to utilize 100% power, the steel must be adequately massive. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Material type – the best choice is high-permeability steel. Cast iron may have worse magnetic properties.
• Smoothness – full contact is possible only on smooth steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
• Temperature influence – high temperature reduces magnetic field. Exceeding the limit temperature can permanently demagnetize the magnet.

* Holding force was tested on a smooth steel plate of 20 mm thickness, when the force acted perpendicularly, however under attempts to slide the magnet the lifting capacity is smaller. In addition, even a slight gap {between} the magnet and the plate lowers the lifting capacity.