UMH 36x8x46 [M6] / N38 - magnetic holder with hook

Strengths and weaknesses of neodymium magnets.

Besides their high retention, neodymium magnets are valued for these benefits:

• They do not lose power, even after nearly 10 years – the drop in strength is only ~1% (theoretically),
• They have excellent resistance to magnetic field loss due to external fields,
• By using a reflective layer of gold, the element presents an proper look,
• They show high magnetic induction at the operating surface, which increases their power,
• Made from properly selected components, these magnets show impressive resistance to high heat, enabling them to function (depending on their shape) at temperatures up to 230°C and above...
• Possibility of accurate machining as well as optimizing to precise needs,
• Significant place in innovative solutions – they are used in magnetic memories, drive modules, advanced medical instruments, as well as industrial machines.
• Thanks to concentrated force, small magnets offer high operating force, with minimal size,

What to avoid - cons of neodymium magnets: tips and applications.

• They are prone to damage upon too strong impacts. To avoid cracks, it is worth securing magnets in special housings. Such protection not only protects the magnet but also improves its resistance to damage
• When exposed to high temperature, neodymium magnets suffer a drop in power. Often, when the temperature exceeds 80°C, their strength decreases (depending on the size, as well as shape of the magnet). For those who need magnets for extreme conditions, we offer [AH] versions withstanding up to 230°C
• Magnets exposed to a humid environment can rust. Therefore while using outdoors, we recommend using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
• Limited ability of creating nuts in the magnet and complicated shapes - recommended is casing - magnet mounting.
• Health risk related to microscopic parts of magnets are risky, when accidentally swallowed, which gains importance in the aspect of protecting the youngest. Furthermore, small elements of these devices can disrupt the diagnostic process medical after entering the body.
• With large orders the cost of neodymium magnets is a challenge,

Breakaway strength of the magnet in ideal conditions – what contributes to it?

The load parameter shown represents the maximum value, obtained under laboratory conditions, namely:

• on a base made of mild steel, effectively closing the magnetic flux
• possessing a thickness of min. 10 mm to ensure full flux closure
• with an polished contact surface
• with zero gap (no impurities)
• during detachment in a direction vertical to the plane
• in temp. approx. 20°C

What influences lifting capacity in practice

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

• Gap (betwixt the magnet and the plate), as even a tiny clearance (e.g. 0.5 mm) results in a decrease in force by up to 50% (this also applies to paint, rust or debris).
• Force direction – catalog parameter refers to pulling vertically. When applying parallel force, the magnet holds significantly lower power (often approx. 20-30% of nominal force).
• Element thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Metal type – different alloys attracts identically. Alloy additives weaken the attraction effect.
• Surface quality – the smoother and more polished the surface, the larger the contact zone and stronger the hold. Unevenness creates an air distance.
• Temperature influence – high temperature reduces pulling force. Exceeding the limit temperature can permanently demagnetize the magnet.

* Lifting capacity was assessed by applying a steel plate with a smooth surface of optimal thickness (min. 20 mm), under perpendicular detachment force, in contrast under attempts to slide the magnet the holding force is lower. Moreover, even a slight gap {between} the magnet and the plate decreases the holding force.