MW 15x4 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010030
GTIN: 5906301810292
Diameter Ø
15 mm [±0,1 mm]
Height
4 mm [±0,1 mm]
Weight
5.3 g
Magnetization Direction
↑ axial
Load capacity
3.32 kg / 32.56 N
Magnetic Induction
291.60 mT
Coating
[NiCuNi] nickel
1.968 ZŁ with VAT / pcs + price for transport
1.600 ZŁ net + 23% VAT / pcs
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Advantages as well as disadvantages of neodymium magnets.
Apart from their notable magnetic energy, neodymium magnets have these key benefits:
- They do not lose strength, even after around ten years – the decrease in lifting capacity is only ~1% (according to tests),
- Magnets very well resist against loss of magnetization caused by external fields,
- The use of an elegant layer of noble metals (nickel, gold, silver) causes the element to look better,
- Magnetic induction on the working layer of the magnet turns out to be extremely intense,
- Through (adequate) combination of ingredients, they can achieve high thermal resistance, allowing for operation at temperatures reaching 230°C and above...
- Thanks to versatility in shaping and the capacity to adapt to specific needs,
- Huge importance in innovative solutions – they serve a role in HDD drives, brushless drives, medical devices, as well as technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, with minimal size,
Drawbacks and weaknesses of neodymium magnets: application proposals
- To avoid cracks upon strong impacts, we recommend using special steel holders. Such a solution secures the magnet and simultaneously improves its durability.
- 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 durability even at temperatures up to 230°C
- They rust in a humid environment - during use outdoors we advise using waterproof magnets e.g. in rubber, plastic
- Due to limitations in creating threads and complex forms in magnets, we propose using casing - magnetic mechanism.
- Health risk resulting from small fragments of magnets pose a threat, if swallowed, which is particularly important in the aspect of protecting the youngest. Furthermore, tiny parts of these devices can complicate diagnosis medical after entering the body.
- With mass production the cost of neodymium magnets is economically unviable,
Detachment force of the magnet in optimal conditions – what it depends on?
Holding force of 3.32 kg is a result of laboratory testing performed under specific, ideal conditions:
- with the application of a sheet made of special test steel, guaranteeing full magnetic saturation
- possessing a thickness of min. 10 mm to ensure full flux closure
- with an ground touching surface
- without the slightest clearance between the magnet and steel
- for force acting at a right angle (pull-off, not shear)
- at temperature approx. 20 degrees Celsius
Magnet lifting force in use – key factors
In practice, the actual holding force is determined by many variables, ranked from most significant:
- Clearance – existence of foreign body (paint, dirt, air) interrupts the magnetic circuit, which lowers capacity rapidly (even by 50% at 0.5 mm).
- Force direction – declared lifting capacity refers to pulling vertically. When attempting to slide, the magnet holds much less (typically approx. 20-30% of maximum force).
- Base massiveness – insufficiently thick sheet causes magnetic saturation, causing part of the flux to be lost into the air.
- Plate material – mild steel attracts best. Alloy steels reduce magnetic properties and lifting capacity.
- Surface quality – the smoother and more polished the surface, the better the adhesion and stronger the hold. Roughness acts like micro-gaps.
- Heat – NdFeB sinters have a negative temperature coefficient. When it is hot they are weaker, and in frost they can be stronger (up to a certain limit).
* Lifting capacity testing was performed on a smooth plate of optimal thickness, under a perpendicular pulling force, however under attempts to slide the magnet the load capacity is reduced by as much as fivefold. Additionally, even a slight gap {between} the magnet’s surface and the plate reduces the holding force.
Safe handling of NdFeB magnets
Risk of cracking
Despite metallic appearance, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may shatter into hazardous fragments.
ICD Warning
Patients with a ICD should keep an safe separation from magnets. The magnetic field can disrupt the functioning of the implant.
Combustion hazard
Fire hazard: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.
Powerful field
Use magnets consciously. Their powerful strength can shock even professionals. Plan your moves and respect their power.
Keep away from computers
Powerful magnetic fields can corrupt files on credit cards, HDDs, and storage devices. Keep a distance of at least 10 cm.
Nickel allergy
A percentage of the population suffer from a sensitization to nickel, which is the typical protective layer for neodymium magnets. Prolonged contact may cause a rash. We suggest wear protective gloves.
Maximum temperature
Avoid heat. NdFeB magnets are susceptible to heat. If you require resistance above 80°C, ask us about special high-temperature series (H, SH, UH).
GPS and phone interference
Remember: neodymium magnets generate a field that disrupts precision electronics. Keep a safe distance from your phone, device, and GPS.
Pinching danger
Large magnets can break fingers in a fraction of a second. Never put your hand between two attracting surfaces.
Do not give to children
Strictly store magnets out of reach of children. Risk of swallowing is significant, and the effects of magnets clamping inside the body are very dangerous.
Warning!
Need more info? Check our post: Are neodymium magnets dangerous?
