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Neodymium Ring Magnets
NdFeB Ring Magnets
NdFeB ring magnets are sometimes also known as discs with central holes.
The NdFeB Rings Magnets exits in two styles – 'pure' rings and 'countersunk' rings. The holes are centrally located.
The countersunk ring allows for the magnet to be screwed onto another item such that the screw is flush with the magnet end face. The countersink is only on one side of the ring magnet so the A version has the countersunk end as a North Pole and the B version has the countersunk end as a South Pole. If the countersunk ring is to clamp onto ferromagnetic material then either the A or B version can be used. If two rings are to attract to each other such that the countersunk faces are attracted, one ring has to be an A version and the other a B version (unlike Poles attract).
Due to their shape, the ring magnets have a higher permeance coefficient than a same-sized disc magnet. This means they can resist demagnetization better, making them ideal for repulsive applications.
We can produce the NdFeB circular rod magnets in different sizes, different grades (strengths and temperature ratings), different coatings/finishes and in axial and diametric magnetization as part of our custom magnet service.
Buyer’s Guide
In order to quote you the best price, please provide us the following informations.
Shape |
Block/Rectangle/Square |
Disc/Round/Cylinder |
Ring/Countersunk |
Dimension |
L (?) x W(? ) xT(?) |
D(?) x T(?) |
OD(?) x ID(?) x T(?) |
For other shapes,please tell more in details or drawing would be much appreciated. | |||
Coating |
Zn,Nickel,Ni-Cu-Ni,Epoxy,Au,Silver or other ? |
||
Working Temperature |
Normal or High temperature ? |
||
Working Temperature |
Grade Max. Operating Temperature |
||
N35-N52 80°C (176°F) | |||
N35M- N50M 100°C (212°F) | |||
N35H-N48H 120°C (248°F) | |||
N35SH-N45SH 150°C (302°F) | |||
N28UH-N40UH 180°C (356°F) | |||
N28EH-N38EH 200°C (392°F) | |||
N28AH-N35AH 220°C (428°F) |
Description |
Sintered Neodymium Strong Magnet |
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Material |
Neodymium-Iron-Boron |
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Working Temperature |
Grade |
Max. Operating Temperature |
N35-N52 |
80°C (176°F) |
|
N35M- N50M |
100°C (212°F) |
|
N35H-N48H |
120°C (248°F) |
|
N35SH-N45SH |
150°C (302°F) |
|
N28UH-N40UH |
180°C (356°F) |
|
N28EH-N38EH |
200°C (392°F) |
|
N28AH-N35AH |
220°C (428°F) |
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Magnet Shape |
Disc, Cylinder, Block, Ring, Countersunk, Segment, Trapezoid, Irregular shapes and more. |
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Magnet Coating |
Ni-Cu-Ni, Nickel, Zn, Gold, Silver, Copper, Epoxy, Phosphating, Chemical, PTFE, Parylene |
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Magnetization Direction |
a. Thickness Magnetized |
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Technology Advantage |
Depending on advanced R&D center, Quality control team and professional machining |
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Delivery Time |
The lead time around 10-25days |
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Payment Terms |
L/C,T/T,Paypal, ESCROW, Western Union |
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Application |
Sintered Neodymium Strong Magnets are widely used in many fields, such as motors, |