BM 450x180x70 [4x M8] - magnetic beam

Pros as well as cons of NdFeB magnets.

Besides their magnetic performance, neodymium magnets are valued for these benefits:

• Their power is durable, and after around 10 years it drops only by ~1% (according to research),
• Neodymium magnets are characterized by exceptionally resistant to demagnetization caused by external field sources,
• In other words, due to the metallic surface of gold, the element looks attractive,
• Magnets exhibit huge magnetic induction on the outer side,
• Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
• Due to the possibility of accurate forming and adaptation to custom needs, NdFeB magnets can be created in a variety of forms and dimensions, which expands the range of possible applications,
• Universal use in modern industrial fields – they are commonly used in data components, brushless drives, medical equipment, and multitasking production systems.
• Relatively small size with high pulling force – neodymium magnets offer high power in compact dimensions, which allows their use in compact constructions

Disadvantages of neodymium magnets:

• At strong impacts they can crack, therefore we recommend placing them in steel cases. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
• We warn that neodymium magnets can lose their strength at high temperatures. To prevent this, we recommend our specialized [AH] magnets, which work effectively even at 230°C.
• Magnets exposed to a humid environment can corrode. Therefore during using outdoors, we recommend using waterproof magnets made of rubber, plastic or other material protecting against moisture
• Due to limitations in producing nuts and complicated forms in magnets, we recommend using cover - magnetic holder.
• Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, tiny parts of these magnets are able to complicate diagnosis medical in case of swallowing.
• With budget limitations the cost of neodymium magnets is economically unviable,

Magnetic strength at its maximum – what it depends on?

The lifting capacity listed is a theoretical maximum value conducted under the following configuration:

• using a sheet made of mild steel, functioning as a circuit closing element
• possessing a thickness of min. 10 mm to avoid saturation
• with an ideally smooth contact surface
• without the slightest air gap between the magnet and steel
• during detachment in a direction perpendicular to the plane
• at temperature approx. 20 degrees Celsius

Magnet lifting force in use – key factors

Please note that the working load will differ depending on the following factors, starting with the most relevant:

• Distance – existence of foreign body (rust, tape, air) interrupts the magnetic circuit, which reduces capacity steeply (even by 50% at 0.5 mm).
• Force direction – catalog parameter refers to detachment vertically. When attempting to slide, the magnet holds significantly lower power (typically approx. 20-30% of maximum force).
• Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Paper-thin metal limits the lifting capacity (the magnet "punches through" it).
• Material type – the best choice is pure iron steel. Cast iron may have worse magnetic properties.
• Surface condition – ground elements guarantee perfect abutment, which increases field saturation. Rough surfaces reduce efficiency.
• Temperature influence – hot environment weakens pulling force. Too high temperature can permanently damage the magnet.

* Holding force was checked on a smooth steel plate of 20 mm thickness, when a perpendicular force was applied, in contrast under shearing force the holding force is lower. Additionally, even a small distance {between} the magnet’s surface and the plate decreases the load capacity.