MW 20x5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010044
GTIN: 5906301810438
Diameter Ø
20 mm [±0,1 mm]
Height
5 mm [±0,1 mm]
Weight
11.78 g
Magnetization Direction
↑ axial
Load capacity
5.53 kg / 54.23 N
Magnetic Induction
277.16 mT
Coating
[NiCuNi] nickel
5.56 ZŁ with VAT / pcs + price for transport
4.52 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
Strengths as well as weaknesses of rare earth magnets.
Besides their magnetic performance, neodymium magnets are valued for these benefits:
- They have constant strength, and over around 10 years their performance decreases symbolically – ~1% (in testing),
- They have excellent resistance to magnetism drop as a result of external magnetic sources,
- A magnet with a smooth gold surface is more attractive,
- Magnetic induction on the working part of the magnet is strong,
- Neodymium magnets are characterized by extremely high magnetic induction on the magnet surface and can work (depending on the form) even at a temperature of 230°C or more...
- Possibility of custom machining and optimizing to precise needs,
- Versatile presence in future technologies – they are utilized in mass storage devices, electric drive systems, diagnostic systems, as well as technologically advanced constructions.
- Thanks to concentrated force, small magnets offer high operating force, with minimal size,
Disadvantages of NdFeB magnets:
- Brittleness is one of their disadvantages. Upon strong impact they can fracture. We advise keeping them in a steel housing, which not only protects them against impacts but also raises their 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 rust. Therefore when using outdoors, we suggest using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- We recommend cover - magnetic mechanism, due to difficulties in producing nuts inside the magnet and complicated shapes.
- Health risk related to microscopic parts of magnets are risky, if swallowed, which gains importance in the context of child safety. Furthermore, tiny parts of these magnets can complicate diagnosis medical when they are in the body.
- High unit price – neodymium magnets cost more than other types of magnets (e.g. ferrite), which hinders application in large quantities
Magnetic strength at its maximum – what contributes to it?
The lifting capacity listed is a result of laboratory testing conducted under the following configuration:
- using a plate made of mild steel, acting as a ideal flux conductor
- possessing a thickness of at least 10 mm to avoid saturation
- characterized by smoothness
- without the slightest insulating layer between the magnet and steel
- during pulling in a direction perpendicular to the plane
- in neutral thermal conditions
Practical aspects of lifting capacity – factors
During everyday use, the real power results from many variables, presented from crucial:
- Air gap (between the magnet and the metal), as even a microscopic clearance (e.g. 0.5 mm) leads to a reduction in lifting capacity by up to 50% (this also applies to paint, rust or debris).
- Pull-off angle – note that the magnet has greatest strength perpendicularly. Under sliding down, the holding force drops drastically, often to levels of 20-30% of the nominal value.
- Substrate thickness – to utilize 100% power, the steel must be sufficiently thick. Thin sheet restricts the attraction force (the magnet "punches through" it).
- Plate material – mild steel attracts best. Alloy admixtures decrease magnetic permeability and holding force.
- Surface structure – the smoother and more polished the plate, the larger the contact zone and higher the lifting capacity. Unevenness acts like micro-gaps.
- Thermal environment – temperature increase causes a temporary drop of induction. It is worth remembering the thermal limit for a given model.
* Lifting capacity testing was performed on a smooth plate of optimal thickness, under perpendicular forces, however under shearing force the lifting capacity is smaller. Moreover, even a minimal clearance {between} the magnet and the plate reduces the holding force.
Safety rules for work with neodymium magnets
Caution required
Handle with care. Neodymium magnets act from a long distance and connect with huge force, often quicker than you can react.
Dust is flammable
Machining of neodymium magnets carries a risk of fire risk. Magnetic powder oxidizes rapidly with oxygen and is hard to extinguish.
This is not a toy
These products are not intended for children. Accidental ingestion of several magnets can lead to them connecting inside the digestive tract, which poses a severe health hazard and requires urgent medical intervention.
Permanent damage
Regular neodymium magnets (grade N) lose power when the temperature exceeds 80°C. The loss of strength is permanent.
Bone fractures
Big blocks can crush fingers in a fraction of a second. Never put your hand betwixt two strong magnets.
ICD Warning
People with a pacemaker should maintain an large gap from magnets. The magnetic field can disrupt the functioning of the implant.
Magnet fragility
Neodymium magnets are sintered ceramics, meaning they are prone to chipping. Collision of two magnets will cause them breaking into small pieces.
Sensitization to coating
Medical facts indicate that nickel (the usual finish) is a potent allergen. For allergy sufferers, refrain from touching magnets with bare hands and choose coated magnets.
Threat to electronics
Equipment safety: Neodymium magnets can damage data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).
Precision electronics
Be aware: rare earth magnets generate a field that confuses precision electronics. Keep a separation from your phone, tablet, and GPS.
Important!
Details about risks in the article: Safety of working with magnets.
