UMGZ 48x24x11.5 [M8] GZ / N38 - magnetic holder external thread

Pros as well as cons of NdFeB magnets.

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

• They have constant strength, and over nearly 10 years their attraction force decreases symbolically – ~1% (according to theory),
• They are extremely resistant to demagnetization induced by external disturbances,
• A magnet with a metallic nickel surface has an effective appearance,
• Neodymium magnets deliver maximum magnetic induction on a contact point, which allows for strong attraction,
• Through (appropriate) combination of ingredients, they can achieve high thermal resistance, enabling action at temperatures approaching 230°C and above...
• Possibility of exact machining and optimizing to atypical conditions,
• Key role in high-tech industry – they are utilized in data components, electromotive mechanisms, advanced medical instruments, as well as technologically advanced constructions.
• Thanks to concentrated force, small magnets offer high operating force, in miniature format,

What to avoid - cons of neodymium magnets and ways of using them

• They are fragile upon too strong impacts. To avoid cracks, it is worth securing magnets in a protective case. Such protection not only protects the magnet but also improves its resistance to damage
• Neodymium magnets lose their force under the influence of heating. As soon as 80°C is exceeded, many of them start losing their power. Therefore, we recommend our special magnets marked [AH], which maintain stability even at temperatures up to 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 nuts and complex forms in magnets, we recommend using a housing - magnetic holder.
• Possible danger related to microscopic parts of magnets can be dangerous, when accidentally swallowed, which is particularly important in the context of child safety. It is also worth noting that tiny parts of these devices can disrupt the diagnostic process medical after entering the body.
• Higher cost of purchase is one of the disadvantages compared to ceramic magnets, especially in budget applications

Maximum lifting force for a neodymium magnet – what affects it?

Information about lifting capacity was defined for ideal contact conditions, including:

• using a sheet made of low-carbon steel, acting as a ideal flux conductor
• with a cross-section minimum 10 mm
• characterized by smoothness
• with zero gap (no coatings)
• for force acting at a right angle (in the magnet axis)
• in temp. approx. 20°C

Lifting capacity in real conditions – factors

Please note that the working load will differ depending on elements below, in order of importance:

• Distance – the presence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which reduces capacity rapidly (even by 50% at 0.5 mm).
• Direction of force – maximum parameter is available only during perpendicular pulling. The force required to slide of the magnet along the plate is standardly several times lower (approx. 1/5 of the lifting capacity).
• Element thickness – for full efficiency, the steel must be adequately massive. Thin sheet restricts the lifting capacity (the magnet "punches through" it).
• Metal type – not every steel attracts identically. High carbon content worsen the interaction with the magnet.
• Smoothness – ideal contact is obtained only on smooth steel. Any scratches and bumps reduce the real contact area, reducing force.
• Temperature influence – high temperature weakens pulling force. Exceeding the limit temperature can permanently damage the magnet.

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