MP 40x20x5 / N38 - ring magnet
ring magnet
Catalog no 030199
GTIN: 5906301812166
Diameter [±0,1 mm]
40 mm
internal diameter Ø [±0,1 mm]
20 mm
Height [±0,1 mm]
5 mm
Weight
23.56 g
Magnetization Direction
↑ axial
Load capacity
5.7 kg / 55.9 N
Magnetic Induction
126.81 mT
Coating
[NiCuNi] nickel
9.40 ZŁ with VAT / pcs + price for transport
7.64 ZŁ net + 23% VAT / pcs
bulk discounts:
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MP 40x20x5 / N38 - ring magnet
Magnetic properties of material N38
Physical properties of NdFeB
Shopping tips
Advantages as well as disadvantages of neodymium magnets NdFeB.
Apart from their superior magnetism, neodymium magnets have these key benefits:
- Their power is maintained, and after around ten years, it drops only by ~1% (according to research),
- They show strong resistance to demagnetization from outside magnetic sources,
- Thanks to the glossy finish and gold coating, they have an elegant appearance,
- They have extremely strong magnetic induction on the surface of the magnet,
- Thanks to their high temperature resistance, they can operate (depending on the geometry) even at temperatures up to 230°C or more,
- With the option for fine forming and personalized design, these magnets can be produced in numerous shapes and sizes, greatly improving engineering flexibility,
- Important function in modern technologies – they are used in computer drives, electric motors, healthcare devices as well as high-tech tools,
- Thanks to their concentrated strength, small magnets offer high magnetic performance, in miniature format,
Disadvantages of neodymium magnets:
- They are fragile when subjected to a powerful impact. If the magnets are exposed to mechanical hits, we recommend in a steel housing. The steel housing, in the form of a holder, protects the magnet from fracture , and at the same time enhances its overall durability,
- They lose field intensity at elevated temperatures. Most neodymium magnets experience permanent loss in strength when heated above 80°C (depending on the geometry and height). However, we offer special variants with high temperature resistance that can operate up to 230°C or higher,
- Due to corrosion risk in humid conditions, it is advisable to use sealed magnets made of plastic for outdoor use,
- The use of a protective casing or external holder is recommended, since machining multi-axis shapes in neodymium magnets is restricted,
- Health risk linked to microscopic shards may arise, if ingested accidentally, which is significant in the health of young users. Moreover, minuscule fragments from these magnets may interfere with diagnostics after being swallowed,
- High unit cost – neodymium magnets are costlier than other types of magnets (e.g., ferrite), which can restrict large-scale applications
Be Cautious with Neodymium Magnets
You should keep neodymium magnets at a safe distance from the wallet, computer, and TV.
Strong magnetic fields emitted by neodymium magnets can damage magnetic storage media such as floppy disks, credit cards, magnetic ID cards, cassette tapes, video tapes, or other devices. In addition, they can damage televisions, VCRs, computer monitors, and CRT displays. You should especially avoid placing neodymium magnets near electronic devices.
Neodymium magnets can become demagnetized at high temperatures.
Under specific conditions, Neodymium magnets can lose their magnetism when subjected to high temperatures.
It is crucial not to allow the magnets to pinch together uncontrollably or place your fingers in their path as they attract to each other.
If have a finger between or alternatively on the path of attracting magnets, there may be a severe cut or even a fracture.
Dust and powder from neodymium magnets are highly flammable.
Avoid drilling or mechanical processing of neodymium magnets. If the magnet is crushed into fine powder or dust, it becomes highly flammable.
Magnets are not toys, children should not play with them.
Neodymium magnets are not toys. You cannot allow them to become toys for children. In the case of small magnets, they can be swallowed and cause choking. In such cases, the only solution is to undergo surgery to remove the magnets, and otherwise, it can even lead to death.
Neodymium magnets are over 10 times more powerful than ferrite magnets (the ones in speakers), and their strength can surprise you.
Familiarize yourself with our information to properly handle these magnets and avoid significant swellings to your body and prevent disruption to the magnets.
Neodymium magnets should not be near people with pacemakers.
Neodymium magnets produce strong magnetic fields that can interfere with the operation of a heart pacemaker. Even if the magnetic field does not affect the device, it can damage its components or deactivate the entire device.
Keep neodymium magnets as far away as possible from GPS and smartphones.
Magnetic fields interfere with compasses and magnetometers used in navigation for air and sea transport, as well as internal compasses of smartphones and GPS devices.
Avoid contact with neodymium magnets if you have a nickel allergy.
Studies show a small percentage of people have allergies to certain metals, including nickel. An allergic reaction often manifests as skin redness and rash. If you have a nickel allergy, you can try wearing gloves or simply avoid direct contact with nickel-plated neodymium magnets.
Neodymium magnets are fragile and can easily crack and get damaged.
Neodymium magnetic are delicate as well as will break if allowed to collide with each other, even from a distance of a few centimeters. They are coated with a shiny nickel plating similar to steel, but they are not as hard. In the case of a collision between two magnets, there can be a scattering of small sharp metal fragments in different directions. Protecting your eyes is essential.
Pay attention!
Please read the article - What danger lies in neodymium magnets? You will learn how to handle them properly.