MW 20x5 / N38 - cylindrical magnet
cylindrical magnet
Catalog no 010044
GTIN: 5906301810438
Diameter Ø [±0,1 mm]
20 mm
Height [±0,1 mm]
5 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
bulk discounts:
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Magnetic properties of material N38
Physical properties of sintered neodymium magnets Nd2Fe14B at 20°C
Shopping tips
Pros and cons of rare earth magnets.
Besides their remarkable strength, neodymium magnets offer the following advantages:
- They retain attractive force for around 10 years – the loss is just ~1% (according to analyses),
- Magnets very well protect themselves against demagnetization caused by ambient magnetic noise,
- By applying a decorative coating of nickel, the element has an professional look,
- The surface of neodymium magnets generates a powerful magnetic field – this is a distinguishing feature,
- Thanks to resistance to high temperature, they can operate (depending on the form) even at temperatures up to 230°C and higher...
- Possibility of individual shaping as well as adjusting to defined conditions,
- Fundamental importance in high-tech industry – they are commonly used in hard drives, motor assemblies, advanced medical instruments, and technologically advanced constructions.
- Thanks to efficiency per cm³, small magnets offer high operating force, in miniature format,
Cons of neodymium magnets: application proposals
- They are prone to damage upon heavy impacts. To avoid cracks, it is worth securing magnets using a steel holder. Such protection not only shields the magnet but also increases its resistance to damage
- When exposed to high temperature, neodymium magnets experience a drop in strength. 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 advise using water-impermeable magnets made of rubber, plastic or other material protecting against moisture
- Due to limitations in realizing nuts and complicated forms in magnets, we recommend using cover - magnetic mount.
- Possible danger resulting from small fragments of magnets pose a threat, in case of ingestion, which is particularly important in the context of child health protection. Furthermore, small elements of these magnets can be problematic in diagnostics medical after entering the body.
- Due to neodymium price, their price is higher than average,
Maximum holding power of the magnet – what affects it?
Information about lifting capacity was defined for optimal configuration, taking into account:
- on a base made of structural steel, effectively closing the magnetic flux
- with a thickness minimum 10 mm
- with a surface perfectly flat
- with total lack of distance (without paint)
- under vertical force direction (90-degree angle)
- at conditions approx. 20°C
Determinants of practical lifting force of a magnet
In real-world applications, the actual lifting capacity is determined by many variables, listed from crucial:
- Distance – the presence of foreign body (rust, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Direction of force – highest force is obtained only during pulling at a 90° angle. The force required to slide of the magnet along the plate is standardly several times smaller (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the attraction force (the magnet "punches through" it).
- Material type – the best choice is pure iron steel. Hardened steels may attract less.
- Smoothness – full contact is obtained only on polished steel. Any scratches and bumps reduce the real contact area, reducing force.
- Thermal factor – high temperature weakens pulling force. Too high temperature can permanently demagnetize the magnet.
* Lifting capacity testing was conducted on plates with a smooth surface of optimal thickness, under perpendicular forces, in contrast under parallel forces the lifting capacity is smaller. In addition, even a minimal clearance {between} the magnet’s surface and the plate reduces the load capacity.
H&S for magnets
Warning for allergy sufferers
Allergy Notice: The nickel-copper-nickel coating contains nickel. If skin irritation happens, cease handling magnets and use protective gear.
Beware of splinters
Despite the nickel coating, the material is delicate and not impact-resistant. Avoid impacts, as the magnet may crumble into hazardous fragments.
Electronic hazard
Data protection: Neodymium magnets can ruin data carriers and delicate electronics (pacemakers, medical aids, mechanical watches).
Heat sensitivity
Monitor thermal conditions. Exposing the magnet to high heat will destroy its properties and strength.
Flammability
Combustion risk: Neodymium dust is highly flammable. Avoid machining magnets without safety gear as this risks ignition.
Adults only
These products are not toys. Swallowing several magnets may result in them pinching intestinal walls, which constitutes a severe health hazard and requires immediate surgery.
Conscious usage
Handle magnets consciously. Their immense force can shock even professionals. Plan your moves and respect their force.
Bone fractures
Watch your fingers. Two large magnets will snap together immediately with a force of several hundred kilograms, destroying anything in their path. Exercise extreme caution!
Danger to pacemakers
For implant holders: Powerful magnets affect medical devices. Maintain at least 30 cm distance or ask another person to work with the magnets.
Impact on smartphones
A strong magnetic field disrupts the functioning of compasses in smartphones and GPS navigation. Maintain magnets close to a device to avoid damaging the sensors.
Safety First!
More info about risks in the article: Magnet Safety Guide.
