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
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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 NdFeB magnets.
Besides their remarkable strength, neodymium magnets offer the following advantages:
- Their power is maintained, and after around ten years it drops only by ~1% (according to research),
- They maintain their magnetic properties even under strong external field,
- By using a decorative coating of nickel, the element acquires an nice look,
- Neodymium magnets ensure maximum magnetic induction on a contact point, which ensures high operational effectiveness,
- Through (appropriate) combination of ingredients, they can achieve high thermal strength, allowing for operation at temperatures approaching 230°C and above...
- Possibility of custom machining and adjusting to concrete applications,
- Universal use in innovative solutions – they are commonly used in HDD drives, electric motors, diagnostic systems, and complex engineering applications.
- Compactness – despite small sizes they offer powerful magnetic field, making them ideal for precision applications
Disadvantages of NdFeB magnets:
- To avoid cracks upon strong impacts, we suggest using special steel holders. Such a solution protects the magnet and simultaneously increases its durability.
- Neodymium magnets lose their power 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
- Due to the susceptibility of magnets to corrosion in a humid environment, we recommend using waterproof magnets made of rubber, plastic or other material immune to moisture, in case of application outdoors
- Limited ability of producing threads in the magnet and complicated forms - recommended is cover - magnet mounting.
- Potential hazard resulting from small fragments of magnets pose a threat, if swallowed, which becomes key in the aspect of protecting the youngest. Furthermore, small elements of these devices are able to disrupt the diagnostic process medical after entering the body.
- High unit price – neodymium magnets are more expensive than other types of magnets (e.g. ferrite), which hinders application in large quantities
Best holding force of the magnet in ideal parameters – what affects it?
Breakaway force was determined for the most favorable conditions, taking into account:
- using a sheet made of mild steel, acting as a ideal flux conductor
- with a cross-section of at least 10 mm
- with an ground touching surface
- without any air gap between the magnet and steel
- for force applied at a right angle (pull-off, not shear)
- at conditions approx. 20°C
What influences lifting capacity in practice
During everyday use, the actual holding force is determined by many variables, ranked from crucial:
- Clearance – the presence of foreign body (paint, tape, gap) interrupts the magnetic circuit, which lowers power rapidly (even by 50% at 0.5 mm).
- Direction of force – highest force is available only during pulling at a 90° angle. The resistance to sliding of the magnet along the surface is typically many times lower (approx. 1/5 of the lifting capacity).
- Substrate thickness – for full efficiency, the steel must be adequately massive. Thin sheet limits the lifting capacity (the magnet "punches through" it).
- Material type – the best choice is high-permeability steel. Cast iron may attract less.
- Smoothness – full contact is possible only on smooth steel. Any scratches and bumps create air cushions, reducing force.
- Thermal environment – temperature increase causes a temporary drop of force. Check the thermal limit for a given model.
* Lifting capacity was measured with the use of a smooth steel plate of optimal thickness (min. 20 mm), under vertically applied force, however under parallel forces the load capacity is reduced by as much as 5 times. Additionally, even a small distance {between} the magnet and the plate decreases the lifting capacity.
Safe handling of neodymium magnets
ICD Warning
Patients with a heart stimulator have to maintain an safe separation from magnets. The magnetism can disrupt the operation of the implant.
Crushing risk
Big blocks can crush fingers instantly. Never place your hand betwixt two attracting surfaces.
Danger to the youngest
Strictly keep magnets out of reach of children. Risk of swallowing is significant, and the consequences of magnets connecting inside the body are fatal.
Dust is flammable
Drilling and cutting of NdFeB material carries a risk of fire hazard. Magnetic powder oxidizes rapidly with oxygen and is difficult to extinguish.
Allergy Warning
A percentage of the population have a sensitization to nickel, which is the typical protective layer for neodymium magnets. Extended handling can result in dermatitis. We strongly advise use protective gloves.
Heat warning
Regular neodymium magnets (N-type) lose power when the temperature surpasses 80°C. This process is irreversible.
Beware of splinters
Neodymium magnets are sintered ceramics, which means they are prone to chipping. Impact of two magnets will cause them cracking into shards.
GPS and phone interference
Navigation devices and mobile phones are highly susceptible to magnetic fields. Close proximity with a strong magnet can decalibrate the sensors in your phone.
Cards and drives
Very strong magnetic fields can destroy records on credit cards, hard drives, and storage devices. Keep a distance of at least 10 cm.
Do not underestimate power
Before starting, check safety instructions. Uncontrolled attraction can break the magnet or injure your hand. Be predictive.
Important!
Want to know more? Check our post: Why are neodymium magnets dangerous?
