Ring Shape Strongest Circle Neodymium Magnets
SDM Magnetics Co., Ltd. is a leading Chinese manufacturer of high quality permanent magnet and magnetic assemblies since 2014. SDM serves a variety of markets include automotive, industrial automation, consumer electronics, green energy, household appliances, and aerospace. To meet the more and more demanding markets, SDM has been concentrating on manufacturing technologies for quality stability and cost reduction. With grain boundary diffusion technology, SDM can offer competitive prices for high coercivity Neodymium magnets. SDM has also built up a strategic cooperation with China's No.1 rare earth miner CHINALCO, which gives us strong and safe backup for rare earth raw materials.
Neodymium magnets are manufactured on the basis of Nd-Fe-B alloys and sintered Neodymium magnets have the highest (BH)max value among all of commercially available permanent magnets. Neodymium ring magnets are circular in shape with a concentric hole inside it. Magnet ring can be divided to pure ring or countersunk ring based on the detailed shape of the inner hole. Neodymium ring magnet should be measured by outer diameter (O.D.), inner diameter (I.D.), and thickness (T). Similar to Neodymium disc magnet, ring shaped magnet can be magnetized with its N pole and S pole opposite flat end surfaces or diametrically magnetized so as to the N pole is on one curved side and the S pole is on opposite curved side. Besides the conventional axially magnetized or diametrically magnetized magnets, radially oriented ring magnet is also available in SDM. In addition, Neodymium magnets are easily corrode under humid condition and are necessary to cover with a protective coating.
Typical Coatings & Shapes of Neodymium Magnet
Magnetic Properties of Sintered Neodymium Magnet
Sintered NdFeB Magnet |
Grade |
Residual Induction (Br) |
Coercive Force (Hcb) |
Intrinsic Coercive Force (Hcj) |
Max Energy Product (BH)max |
Max Working Temp. |
T |
kGs |
kA/m |
kOe |
kA/m |
kOe |
Kj/m³ |
MGOe |
(°C) |
N35 |
1.17-1.22 |
11.7-12.2 |
≥868 |
≥10.9 |
≥955 |
≥12 |
263-287 |
33-36 |
80 |
N38 |
1.22-1.25 |
12.2-12.5 |
≥899 |
≥11.3 |
≥955 |
≥12 |
287-310 |
36-39 |
80 |
N40 |
1.25-1.28 |
12.5-12.8 |
≥907 |
≥11.4 |
≥955 |
≥12 |
302-326 |
38-41 |
80 |
N42 |
1.28-1.32 |
12.8-13.2 |
≥915 |
≥11.5 |
≥955 |
≥12 |
318-342 |
40-43 |
80 |
N45 |
1.32-1.38 |
13.2-13.8 |
≥923 |
≥11.6 |
≥955 |
≥12 |
342-366 |
43-46 |
80 |
N48 |
1.38-1.42 |
13.8-14.2 |
≥923 |
≥11.6 |
≥955 |
≥12 |
366-390 |
46-49 |
80 |
N50 |
1.40-1.45 |
14.0-14.5 |
≥796 |
≥10 |
≥876 |
≥11 |
374-406 |
47-51 |
60 |
N52 |
1.43-1.48 |
14.3-14.8 |
≥796 |
≥10 |
≥876 |
≥11 |
390-422 |
49-53 |
60 |
N35M |
1.17-1.22 |
11.7-12.2 |
≥868 |
≥10.9 |
≥1114 |
≥14 |
263-287 |
33-36 |
100 |
N38M |
1.22-1.25 |
12.2-12.5 |
≥899 |
≥11.3 |
≥1114 |
≥14 |
287-310 |
36-39 |
100 |
N40M |
1.25-1.28 |
12.5-12.8 |
≥923 |
≥11.6 |
≥1114 |
≥14 |
302-326 |
38-41 |
100 |
N42M |
1.28-1.32 |
12.8-13.2 |
≥955 |
≥12 |
≥1114 |
≥14 |
318-342 |
40-43 |
100 |
N45M |
1.32-1.38 |
13.2-13.8 |
≥955 |
≥12.5 |
≥1114 |
≥14 |
342-366 |
43-46 |
100 |
N48M |
1.37-1.43 |
13.7-14.3 |
≥1027 |
≥12.9 |
≥1114 |
≥14 |
366-390 |
46-49 |
100 |
N50M |
1.40-1.45 |
14.0-14.5 |
≥1033 |
≥13 |
≥1114 |
≥14 |
382-406 |
48-51 |
100 |
N35H |
1.17-1.22 |
11.7-12.2 |
≥868 |
≥10.9 |
≥1353 |
≥17 |
263-287 |
33-36 |
120 |
N38H |
1.22-1.25 |
12.2-12.5 |
≥899 |
≥11.3 |
≥1353 |
≥ 17 |
287-310 |
36-39 |
120 |
N40H |
1.25-1.28 |
12.5-12.8 |
≥923 |
≥11.6 |
≥1353 |
≥17 |
302-326 |
38-41 |
120 |
N42H |
1.28-1.32 |
12.8-13.2 |
≥955 |
≥12 |
≥1353 |
≥17 |
318-342 |
40-43 |
120 |
N45H |
1.32-1.36 |
13.2-13.6 |
≥963 |
≥12.1 |
≥1353 |
≥ 17 |
326-358 |
43-46 |
120 |
N48H |
1.37-1.43 |
13.7-14.3 |
≥995 |
≥12.5 |
≥1353 |
≥17 |
366-390 |
46-49 |
120 |
N35SH |
1.17-1.22 |
11.7-12.2 |
≥876 |
≥11 |
≥1592 |
≥20 |
263-287 |
33-36 |
150 |
N38SH |
1.22-1.25 |
12.2-12.5 |
≥907 |
≥11.4 |
≥1592 |
≥20 |
287-310 |
36-39 |
150 |
N40SH |
1.25-1.28 |
12.5-12.8 |
≥939 |
≥11.8 |
≥1592 |
≥20 |
302-326 |
38-41 |
150 |
N42SH |
1.28-1.32 |
12.8-13.2 |
≥987 |
≥12.4 |
≥1592 |
≥20 |
318-342 |
40-43 |
150 |
N45SH |
1.32-1.38 |
13.2-13.8 |
≥1003 |
≥12.6 |
≥1592 |
≥20 |
342-366 |
43-46 |
150 |
N28UH |
1.04-108 |
10.4-10.8 |
≥764 |
≥9.6 |
≥1990 |
≥25 |
207-231 |
26-29 |
180 |
N30UH |
1.08-1.13 |
10.8-11.3 |
≥812 |
≥10.2 |
≥1990 |
≥25 |
223-247 |
28-31 |
180 |
N33UH |
1.13-1.17 |
11.3-11.7 |
≥852 |
≥10.7 |
≥1990 |
≥25 |
247-271 |
31-34 |
180 |
N35UH |
1.17-1.22 |
11.7-12.2 |
≥860 |
≥10.8 |
≥1990 |
≥25 |
263-287 |
33-36 |
180 |
N38UH |
1.22-1.25 |
12.2-12.5 |
≥876 |
≥11 |
≥1990 |
≥25 |
287-310 |
36-39 |
180 |
N40UH |
1.25-1.28 |
12.5-12.8 |
≥899 |
≥11.3 |
≥1990 |
≥25 |
302-326 |
38-41 |
180 |
N42UH |
1.28-1.32 |
12.8-13.2 |
≥899 |
≥11.3 |
≥1990 |
≥25 |
318-342 |
40-43 |
180 |
N28EH |
1.04-1.08 |
10.4-10.8 |
≥780 |
≥9.8 |
≥2388 |
≥30 |
207-231 |
26-29 |
200 |
N30EH |
1.08-1.13 |
10.8-11.3 |
≥812 |
≥10.2 |
≥2388 |
≥30 |
223-247 |
28-31 |
200 |
N33EH |
1.13-1.17 |
11.3-11.7 |
≥836 |
≥10.5 |
≥2388 |
≥30 |
247-271 |
31-34 |
200 |
N35EH |
1.17-1.22 |
11.7-12.2 |
≥876 |
≥11 |
≥2388 |
≥30 |
263-287 |
33-36 |
200 |
N38EH |
1.22-1.25 |
12.2-12.5 |
≥899 |
≥11.3 |
≥2388 |
≥30 |
287-310 |
36-39 |
200 |
N40EH |
1.25-1.28 |
12.5-12.8 |
≥899 |
≥11.3 |
≥2388 |
≥30 |
302-326 |
38-41 |
200 |
N28AH |
1.04-1.08 |
10.4-10.8 |
≥787 |
≥9.9 |
≥2624 |
≥33 |
207-231 |
26-29 |
230 |
N30AH |
1.08-1.13 |
10.8-11.3 |
≥819 |
≥10.3 |
≥2624 |
≥33 |
223-247 |
28-31 |
230 |
N33AH |
1.13-1.17 |
11.3-11.7 |
≥843 |
≥10.6 |
≥2624 |
≥33 |
247-271 |
31-34 |
230 |
N35AH |
1.17-1.22 |
11.7-12.2 |
≥876 |
≥11 |
≥2624 |
≥33 |
263-287 |
33-36 |
230 |
N38AH |
1.22-1.25 |
12.2-12.5 |
≥899 |
≥11.3 |
≥2624 |
≥33 |
287-310 |
36-39 |
230 |
Manufacturing Process of Sintered Neodymium Magnet
Magnetization Direction Of Arc Magnet
• Strategic cooperation with China's No.1 rare earth miner CHINALCO, which enables us strong and safe backup for rare earth raw materials cost stability, 3 x -3% annual price down guaranteed.
• ISO/TS 16949, VDA 6.3, ISO9001, ISO14001 certified company, RoHS, REACH, SGS complied product.
• 0 PPM performance for General Motor's OEM since 2010, remarkable customers such as SIEMENS, BMW, REGAL BELOIT, NIDEC, ELECTROLUX, S&T Motiv.
• Over 100 million neodymium magnets delivered to American, European, Asian and African countries. Neodymium Rare Earth Magnet for Motors,Generators and Speakers, we are good at it.
• One stop service from R&D to mass production for all Neodymium Rare Earth Magnet and Neodymium Magnet assemblies. Especailly the High Grade Neodymium Rare Earth magnet and High Hcj Neodymium Rare Earth Magnet.
1:How long will you give me the reply? |
we will contact you in 12 hours as soon as we can. |
2:Could I get samples? |
Yes,we have materials in stock to help you to get the samples as soon as we can. |
3:How about the quality of the magnets? |
We have the certification of ISO,TS and ROSH,we could send the certification test of our company to you. |
4:How is the price? |
As we believe the quality is the most important,we will provide the best quality magnet we can with reasonable price. |
5:Could you provide me the shortest lead time? |
We have materials in our stock,if you really need,you can tell us and we will try our best to satisfy you. |
6:Could I visit your factory? |
Of course,if you need we will help you to visit our factory. |
7:If I have paid,when will you help me to produce? |
When we have received the money in our account,we will give you the receipt and arrange to produce immediately. |