Sintered NdFeB permanent magnet material according to the intensity of magnetic pole coercive force is divided into low coercive force N, moderate coercive force M, high coercive force H , high coercive force SH, high coercive force UH, high coercive force EH six categories .
| Magnetic properties of Sintered NdFeB Magnets | |||||
| Grade | Br | Hcb | Hcj | （ BH ）max | (Tw) |
| mT | kA/m | kA/m | kJ/m3 | ||
| (kGs) | (kOe) | (kOe) | (MGOe) | ||
| N35 | 1170-1220 | ≥ 868 | ≥ 955 | 263-287 | 80 ℃ |
| (11.7-12.2) | ( ≥ 10.9) | ( ≥ 12) | (33-36) | ||
| N38 | 1220-1250 | ≥ 899 | ≥ 955 | 287-310 | 80 ℃ |
| (12.2-12.5) | ( ≥ 11.3) | ( ≥ 12) | (36-39) | ||
| N40 | 1250-1280 | ≥ 907 | ≥ 955 | 302-326 | 80 ℃ |
| (12.5-12.8) | ( ≥ 11.4) | ( ≥ 12) | (38-41) | ||
| N42 | 1280-1320 | ≥ 915 | ≥ 955 | 318-342 | 80 ℃ |
| (12.8-13.2) | ( ≥ 11.5) | ( ≥ 12) | (40-43) | ||
| N45 | 1320-1380 | ≥ 923 | ≥ 955 | 342-366 | 80 ℃ |
| (13.2-13.8) | ( ≥ 11.6) | ( ≥ 12) | (43-46) | ||
| N48 | 1380-1420 | ≥ 923 | ≥ 876 | 366-390 | 80 ℃ |
| (13.8-14.2) | ( ≥ 11.6) | ( ≥ 12) | (46-49) | ||
| N50 | 1400-1450 | ≥ 796 | ≥ 876 | 382-406 | 60 ℃ |
| (14.0-14.5) | ( ≥ 10.0) | ( ≥ 11) | (48-51) | ||
| N52 | 1430-1480 | ≥ 796 | ≥ 876 | 398-422 | 60 ℃ |
| (14.3-14.8) | ( ≥ 10.0) | ( ≥ 11) | (50-53) | ||
| 30M | 1080-1130 | ≥ 796 | ≥ 1114 | 223-247 | 100 ℃ |
| (10.8-11.3) | ( ≥ 10.0) | ( ≥ 14) | (28-31) | ||
| 33M | 1130-1170 | ≥ 836 | ≥ 1114 | 247-263 | 100 ℃ |
| (11.3-11.7) | ( ≥ 10.5) | ( ≥ 14) | (31-33) | ||
| 35M | 1170-1220 | ≥ 868 | ≥ 1114 | 263-287 | 100 ℃ |
| (11.7-12.2) | ( ≥ 10.9) | ( ≥ 14) | (33-36) | ||
| 38M | 1220-1250 | ≥ 899 | ≥ 1114 | 287-310 | 100 ℃ |
| (12.2-12.5) | ( ≥ 11.3) | ( ≥ 14) | (36-39) | ||
| 40M | 1250-1280 | ≥ 923 | ≥ 1114 | 302-326 | 100 ℃ |
| (12.5-12.8) | ( ≥ 11.6) | ( ≥ 14) | (38-41) | ||
| 42M | 1280-1320 | ≥ 955 | ≥ 1114 | 318-342 | 100 ℃ |
| (12.8-13.2) | ( ≥ 12.0) | ( ≥ 14) | (40-43) | ||
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