MW 8x1.5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010101
GTIN: 5906301811008
Diameter Ø [±0,1 mm]
8 mm
Height [±0,1 mm]
1.5 mm
Weight
0.57 g
Magnetization Direction
↑ axial
Load capacity
0.66 kg / 6.47 N
Magnetic Induction
217.52 mT
Coating
[NiCuNi] nickel
0.455 ZŁ with VAT / pcs + price for transport
0.370 ZŁ net + 23% VAT / pcs
bulk discounts:
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Strengths and weaknesses of rare earth magnets.
Besides their tremendous field intensity, neodymium magnets offer the following advantages:
- They have stable power, and over around 10 years their attraction force decreases symbolically – ~1% (according to theory),
- They retain their magnetic properties even under strong external field,
- The use of an elegant finish of noble metals (nickel, gold, silver) causes the element to look better,
- The surface of neodymium magnets generates a concentrated magnetic field – this is one of their assets,
- 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...
- Due to the option of free molding and adaptation to specialized solutions, neodymium magnets can be modeled in a variety of forms and dimensions, which amplifies use scope,
- Huge importance in modern technologies – they are utilized in hard drives, brushless drives, medical equipment, as well as multitasking production systems.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages of NdFeB magnets:
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a special holder, 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 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 advise using water-impermeable magnets made of rubber, plastic or other material resistant to moisture
- Due to limitations in creating threads and complicated shapes in magnets, we recommend using casing - magnetic mechanism.
- Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which gains importance in the context of child safety. Additionally, small elements of these devices can be problematic in diagnostics medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which increases costs of application in large quantities
Optimal lifting capacity of a neodymium magnet – what contributes to it?
The lifting capacity listed is a measurement result conducted under standard conditions:
- on a block made of structural steel, perfectly concentrating the magnetic field
- with a thickness of at least 10 mm
- characterized by smoothness
- with zero gap (without impurities)
- during pulling in a direction perpendicular to the plane
- at temperature approx. 20 degrees Celsius
Determinants of lifting force in real conditions
In real-world applications, the actual lifting capacity depends on several key aspects, presented from crucial:
- Space between magnet and steel – every millimeter of separation (caused e.g. by veneer or dirt) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Angle of force application – highest force is reached only during pulling at a 90° angle. The shear force of the magnet along the plate is standardly many times smaller (approx. 1/5 of the lifting capacity).
- Element thickness – for full efficiency, the steel must be sufficiently thick. Paper-thin metal limits the attraction force (the magnet "punches through" it).
- Material composition – different alloys reacts the same. Alloy additives weaken the interaction with the magnet.
- Surface finish – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, weakening the magnet.
- Heat – NdFeB sinters have a sensitivity to temperature. At higher temperatures they are weaker, and at low temperatures gain strength (up to a certain limit).
* Lifting capacity testing was conducted on a smooth plate of optimal thickness, under a perpendicular pulling force, whereas under parallel forces the holding force is lower. Moreover, even a minimal clearance {between} the magnet’s surface and the plate lowers the load capacity.
Safe handling of neodymium magnets
Demagnetization risk
Standard neodymium magnets (grade N) undergo demagnetization when the temperature exceeds 80°C. This process is irreversible.
Avoid contact if allergic
Allergy Notice: The nickel-copper-nickel coating consists of nickel. If skin irritation happens, cease handling magnets and wear gloves.
This is not a toy
Neodymium magnets are not intended for children. Swallowing a few magnets may result in them connecting inside the digestive tract, which constitutes a direct threat to life and requires urgent medical intervention.
Physical harm
Mind your fingers. Two powerful magnets will join immediately with a force of several hundred kilograms, crushing everything in their path. Exercise extreme caution!
Do not drill into magnets
Mechanical processing of neodymium magnets carries a risk of fire risk. Neodymium dust oxidizes rapidly with oxygen and is difficult to extinguish.
Data carriers
Do not bring magnets close to a purse, computer, or screen. The magnetic field can irreversibly ruin these devices and wipe information from cards.
Respect the power
Before use, read the rules. Uncontrolled attraction can destroy the magnet or hurt your hand. Be predictive.
Magnets are brittle
Neodymium magnets are ceramic materials, which means they are fragile like glass. Clashing of two magnets leads to them shattering into shards.
Implant safety
People with a heart stimulator have to keep an absolute distance from magnets. The magnetism can disrupt the operation of the implant.
GPS and phone interference
Remember: rare earth magnets produce a field that disrupts sensitive sensors. Keep a safe distance from your mobile, device, and GPS.
Attention!
Need more info? Check our post: Are neodymium magnets dangerous?
