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
Advantages as well as disadvantages of neodymium magnets.
Besides their magnetic performance, neodymium magnets are valued for these benefits:
- They retain attractive force for around ten years – the loss is just ~1% (according to analyses),
- Magnets perfectly defend themselves against loss of magnetization caused by external fields,
- Thanks to the shiny finish, the layer of nickel, gold, or silver-plated gives an visually attractive appearance,
- They show high magnetic induction at the operating surface, making them more effective,
- Thanks to resistance to high temperature, they are capable of working (depending on the form) even at temperatures up to 230°C and higher...
- Thanks to freedom in shaping and the capacity to customize to individual projects,
- Universal use in electronics industry – they serve a role in HDD drives, electric drive systems, diagnostic systems, as well as complex engineering applications.
- Compactness – despite small sizes they generate large force, making them ideal for precision applications
Cons of neodymium magnets and ways of using them
- At strong impacts they can break, therefore we advise placing them in strong housings. A metal housing provides additional protection against damage, as well as increases the magnet's durability.
- We warn that neodymium magnets can lose their power at high temperatures. To prevent this, we advise our specialized [AH] magnets, which work effectively even at 230°C.
- When exposed to humidity, magnets usually rust. For applications outside, it is recommended to use protective magnets, such as magnets in rubber or plastics, which prevent oxidation as well as corrosion.
- Limited ability of producing nuts in the magnet and complicated shapes - preferred is a housing - magnetic holder.
- Possible danger related to microscopic parts of magnets pose a threat, when accidentally swallowed, which gains importance in the context of child health protection. It is also worth noting that small elements of these devices are able to complicate diagnosis medical in case of swallowing.
- 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 it depends on?
The lifting capacity listed is a measurement result conducted under the following configuration:
- on a plate made of structural steel, perfectly concentrating the magnetic flux
- whose thickness equals approx. 10 mm
- characterized by smoothness
- with zero gap (without coatings)
- for force acting at a right angle (in the magnet axis)
- in neutral thermal conditions
Practical aspects of lifting capacity – factors
Effective lifting capacity impacted by specific conditions, such as (from priority):
- Gap between surfaces – even a fraction of a millimeter of separation (caused e.g. by veneer or unevenness) drastically reduces the magnet efficiency, often by half at just 0.5 mm.
- Force direction – note that the magnet has greatest strength perpendicularly. Under sliding down, the capacity drops significantly, often to levels of 20-30% of the maximum value.
- Metal thickness – thin material does not allow full use of the magnet. Part of the magnetic field penetrates through instead of converting into lifting capacity.
- Material composition – different alloys reacts the same. High carbon content weaken the interaction with the magnet.
- Plate texture – smooth surfaces ensure maximum contact, which increases force. Uneven metal reduce efficiency.
- Thermal environment – heating the magnet causes a temporary drop of induction. Check the maximum operating temperature for a given model.
* Lifting capacity was measured by applying a steel plate with a smooth surface of suitable thickness (min. 20 mm), under perpendicular pulling force, however under attempts to slide the magnet the holding force is lower. Additionally, even a small distance {between} the magnet and the plate reduces the load capacity.
Safe handling of NdFeB magnets
Combustion hazard
Powder generated during machining of magnets is self-igniting. Do not drill into magnets without proper cooling and knowledge.
Magnet fragility
NdFeB magnets are sintered ceramics, meaning they are prone to chipping. Impact of two magnets leads to them breaking into small pieces.
Hand protection
Risk of injury: The attraction force is so immense that it can result in blood blisters, pinching, and broken bones. Protective gloves are recommended.
Heat warning
Standard neodymium magnets (N-type) undergo demagnetization when the temperature exceeds 80°C. Damage is permanent.
Safe distance
Very strong magnetic fields can corrupt files on payment cards, HDDs, and storage devices. Stay away of at least 10 cm.
Allergy Warning
Certain individuals have a sensitization to Ni, which is the typical protective layer for NdFeB magnets. Frequent touching can result in skin redness. We strongly advise use safety gloves.
No play value
Adult use only. Small elements can be swallowed, causing serious injuries. Keep away from kids and pets.
GPS Danger
A strong magnetic field interferes with the functioning of compasses in phones and GPS navigation. Maintain magnets close to a smartphone to avoid breaking the sensors.
Implant safety
Health Alert: Strong magnets can deactivate pacemakers and defibrillators. Stay away if you have electronic implants.
Handling guide
Handle with care. Rare earth magnets act from a distance and connect with massive power, often quicker than you can move away.
Important!
Need more info? Check our post: Are neodymium magnets dangerous?
