Magnet Grade Cross-Reference: NdFeB, SmCo & Ferrite
Each row is an AIC grade; the columns give the nearest published grade from each source — NdFeB: MMPA, VACODYM, Shin-Etsu, NEOMAX, NEOREC, Arnold; SmCo: MMPA, VACOMAX, Shin-Etsu, Hitachi, RECOMA; ferrite: MMPA, C-classes, TDK FB. Holding a foreign grade? Find it in its maker's column (it may match more than one AIC row) — or send it to us and we will match it.
Each cell is the source grade nearest to the AIC grade by published remanence (Br) and intrinsic coercivity (HcJ), computed with one rule — not an officially stated equivalence. A candidate qualifies when its Br is within 5 % of the AIC grade (0.1 point rounding slack) and its HcJ is 90–135 % of the AIC guarantee (for ferrite, of the published range; inside the range counts as equal). Of those, the one with the smallest combined distance (ΔBr ÷ 2.5 %)² + (ΔHcJ ÷ 15 %)² is shown. Br compares the AIC range centre with the source's range centre (Shin-Etsu, NEOMAX, NEOREC, RECOMA ranges) or, for VAC, MMPA, Arnold NdFeB, C-classes and TDK FB, their typical/nominal value; makers' guaranteed minimums are on their datasheets. Each cell shows the Br and HcJ differences (+ means the source grade is higher than AIC's) and the source's published HcJ in kA/m — minimum values, except MMPA and C-classes (typical) and TDK FB (nominal), whose differences compare a typical value with AIC's guarantee and are indicative only. * marks a loose match: Br differs by more than 2.5 %, or HcJ is more than 5 % lower or more than 15 % higher. A lower HcJ can mean a lower temperature class (e.g. AH → EH) — check the candidate's rated temperature; a higher HcJ usually means a higher class and higher cost. “—” means no listed grade from that source qualifies — not that the maker has no such grade. Always compare full datasheets, and ask us to confirm before substituting.
Sintered NdFeB
| AIC grade | Br | HcJ (kA/m) | Max °C | MMPA 0100-00 (typical) | VAC VACODYM | Shin-Etsu | Proterial NEOMAX | TDK NEOREC | Arnold |
|---|---|---|---|---|---|---|---|---|---|
| N35 | 1.18–1.23 T | ≥955 | 80 | 38/15*Br +3.7% · HcJ 1190 (+24.6%) | — | N37HA*Br +0.8% · HcJ 1273 (+33.3%) | — | — | N35Br +0.4% · HcJ 955 (0%) |
| N42 | 1.29–1.33 T | ≥955 | 80 | 42/15*Br 0% · HcJ 1190 (+24.6%) | 745 AP*Br +2.3% · HcJ 1115 (+16.8%) | N44MA*Br +1.1% · HcJ 1114 (+16.6%) | NMX-44*Br +1.5% · HcJ 875 (−8.4%) | NEOREC42B*Br +1.5% · HcJ 1114 (+16.6%) | N42Br +0.4% · HcJ 955 (0%) |
| N48 | 1.37–1.41 T | ≥876 | 80 | 48/11Br −1.1% · HcJ 880 (+0.5%) | 801 TP*Br +2.2% · HcJ 1035 (+18.2%) | N52-F*Br +3.6% · HcJ 995 (+13.6%) | NMX-S52*Br +4.3% · HcJ 875 (−0.1%) | NEOREC47B*Br 0% · HcJ 1114 (+27.2%) | N48Br +0.7% · HcJ 875 (−0.1%) |
| N52 | 1.43–1.48 T | ≥876 | 80 | 50/11*Br −3.1% · HcJ 880 (+0.5%) | 722 HRBr +1% · HcJ 875 (−0.1%) | N52-FBr −1% · HcJ 995 (+13.6%) | NMX-S52Br −0.3% · HcJ 875 (−0.1%) | NEOREC50BF*Br −2.4% · HcJ 1114 (+27.2%) | N52Br −0.3% · HcJ 875 (−0.1%) |
| 35M | 1.18–1.23 T | ≥1114 | 100 | 32/16Br −2.1% · HcJ 1270 (+14%) | 633 AP*Br +4.6% · HcJ 1355 (+21.6%) | N37HABr +0.8% · HcJ 1273 (+14.3%) | — | — | N35MBr +0.4% · HcJ 1114 (0%) |
| 42M | 1.29–1.33 T | ≥1114 | 100 | 42/15Br 0% · HcJ 1190 (+6.8%) | 745 APBr +2.3% · HcJ 1115 (+0.1%) | N44MABr +1.1% · HcJ 1114 (0%) | NMX-42BHBr −0.8% · HcJ 1114 (0%) | NEOREC42BBr +1.5% · HcJ 1114 (0%) | N42MBr +0.4% · HcJ 1114 (0%) |
| 35H | 1.18–1.23 T | ≥1353 | 120 | 32/16*Br −2.1% · HcJ 1270 (−6.1%) | 633 AP*Br +4.6% · HcJ 1355 (+0.1%) | N37HA*Br +0.8% · HcJ 1273 (−5.9%) | NMX-37SH*Br +0.4% · HcJ 1671 (+23.5%) | — | N35HBr +0.4% · HcJ 1353 (0%) |
| 42H | 1.29–1.33 T | ≥1353 | 120 | — | 238 APBr −0.8% · HcJ 1355 (+0.1%) | N42H*Br −0.4% · HcJ 1273 (−5.9%) | NMX-42PF*Br −0.8% · HcJ 1273 (−5.9%) | NEOREC40HBr −0.8% · HcJ 1353 (0%) | N42HBr −0.8% · HcJ 1353 (0%) |
| 35SH | 1.18–1.23 T | ≥1592 | 150 | 34/22Br −0.7% · HcJ 1770 (+11.2%) | 776 AP*Br +4.6% · HcJ 1670 (+4.9%) | N36SHBr +1.2% · HcJ 1671 (+5%) | NMX-37SHBr +0.4% · HcJ 1671 (+5%) | NEOREC38UH*Br +4.6% · HcJ 1990 (+25%) | N35SHBr +0.4% · HcJ 1592 (0%) |
| 42SH | 1.29–1.33 T | ≥1592 | 150 | 40/23Br −1.5% · HcJ 1830 (+14.9%) | 776 TPBr +0.8% · HcJ 1670 (+4.9%) | N42SHBr −1.1% · HcJ 1671 (+5%) | NMX-43SHBr −1.1% · HcJ 1671 (+5%) | NEOREC42SHBr −0.8% · HcJ 1671 (+5%) | N42SHBr 0% · HcJ 1592 (0%) |
| 38UH | 1.23–1.26 T | ≥1989 | 180 | 38/23*Br −0.4% · HcJ 1830 (−8%) | 992 TP*Br −2% · HcJ 2385 (+19.9%) | — | NMX-37FBr 0% · HcJ 1989 (0%) | NEOREC38UHBr +1.2% · HcJ 1990 (+0.1%) | N38UHBr +1.2% · HcJ 1990 (+0.1%) |
| 35EH | 1.17–1.23 T | ≥2388 | 200 | 32/31*Br −3.3% · HcJ 2470 (+3.4%) | 992 TPBr +1.7% · HcJ 2385 (−0.1%) | N32Z*Br −5% · HcJ 2387 (0%) | NMX-S36UHBr 0% · HcJ 2387 (0%) | NEOREC35UXBr 0% · HcJ 2387 (0%) | N35EHBr 0% · HcJ 2388 (0%) |
| 35AH | 1.17–1.23 T | ≥2625 | 230 | 32/31*Br −3.3% · HcJ 2470 (−5.9%) | 890 TPBr −0.8% · HcJ 2625 (0%) | N32Z*Br −5% · HcJ 2387 (−9.1%) | NMX-S36UH*Br 0% · HcJ 2387 (−9.1%) | NEOREC35NXBr 0% · HcJ 2626 (0%) | N35AHBr −0.4% · HcJ 2706 (+3.1%) |
Samarium cobalt (SmCo)
| AIC grade | Br | HcJ (kA/m) | Max °C | MMPA 0100-00 (typical) | VAC VACOMAX | Shin-Etsu | Hitachi Metals | Arnold RECOMA |
|---|---|---|---|---|---|---|---|---|
| SMG-24H (Sm₂Co₁₇) | 0.96–1.03 T | ≥1990 | 350 | 24/26Br +0.5% · HcJ 2070 (+4%) | — | — | — | — |
| SMG-28H (Sm₂Co₁₇) | 1.04–1.09 T | ≥1990 | 350 | 26/26Br +0.5% · HcJ 2070 (+4%) | — | — | — | — |
| SMG-32H (Sm₂Co₁₇) | 1.12–1.15 T | ≥1990 | 350 | 30/24Br +2.2% · HcJ 1910 (−4%) | — | — | — | — |
| SM-16 (SmCo₅) | 0.79–0.86 T | ≥1592 | 250 | 16/19*Br +0.6% · HcJ 1510 (−5.2%) | — | — | H-18C*Br +3% · HcJ 1591 (−0.1%) | 18*Br +3% · HcJ 2000 (+25.6%) |
Hard ferrite
| AIC grade | Br | HcJ (kA/m) | Max °C | MMPA 0100-00 (typical · class · IEC) | C-class (distributor, typical) | TDK FB (nominal) |
|---|---|---|---|---|---|---|
| Y25 | 360–400 mT | 140–200 | 250 | 3.4/2.5 (Ceramic 5 · S1-1-6)Br 0% · HcJ 200 (0%) | C5Br 0% · HcJ 200 (0%) | FB3N*Br +3.9% · HcJ 239 (+19.4%) |
| Y30H-1 | 380–400 mT | 235–290 | 250 | 3.5/3.1 (Ceramic 8 · S1-1-5)Br −1.3% · HcJ 245 (0%) | C8 / C8ABr −1.3% · HcJ 242 (0%) | FB3NBr +1.3% · HcJ 239 (0%) |
| Y32 | 400–420 mT | 165–195 | 250 | 4.0/2.9*Br 0% · HcJ 230 (+17.9%) | C8B*Br +2.4% · HcJ 236 (+21%) | FB3N*Br −3.7% · HcJ 239 (+22.4%) |
| Y33H | 410–430 mT | 250–275 | 250 | 4.0/2.9*Br −2.4% · HcJ 230 (−8%) | C8B*Br 0% · HcJ 236 (−5.6%) | FB5DBr −1.2% · HcJ 263 (0%) |
| Y35 | 430–450 mT | 217–241 | 250 | — | C8B*Br −4.5% · HcJ 236 (0%) | FB6NBr 0% · HcJ 263 (+9%) |
| Y40 | 440–460 mT | 340–360 | 250 | — | — | FB9BBr 0% · HcJ 358 (0%) |
- MMPA designations read BHmax (MGOe) / HcJ (kOe); the 2000-edition standard stops at 50/11.
- Arnold rates N52 at 60 °C and AH at 220 °C; AIC's datasheet gives 80 °C and 230 °C.
- Most SmCo cells are “—” because AIC SMG grades guarantee HcJ ≥ 1990 kA/m, while same-Br grades such as VACOMAX 225 AP/TP, RECOMA 24HE/28HE, Shin-Etsu R28HS/R32HS and Hitachi H-26SV guarantee 1500–1750 kA/m. For ~300 °C duty they can still substitute — ask us to confirm.
- NEOMAX, NEOREC and Hitachi SmCo values come from archived Hitachi Metals (now Proterial) and TDK catalogues; current lines may differ. C5 and C8 are the usual names for MMPA Ceramic 5 and 8; C8A, C8B, C9 and C10 are distributor names. Grade not listed? Send it to us and we will match it.
Sources
- MMPA Standard 0100-00
- VAC — Product Information VACODYM / VACOMAX
- Shin-Etsu — Nd magnet lineup
- Shin-Etsu — per-grade datasheets (NdFeB & SmCo, e.g. R28HS)
- Hitachi Metals — NEOMAX catalogue (2017, archived)
- Hitachi Metals — rare-earth magnets incl. SmCo (2005, archived)
- TDK — NEOREC summary (archived)
- TDK — FB ferrite summary (archived)
- Arnold Magnetic Technologies — NdFeB catalog
- Arnold — RECOMA samarium cobalt
- Eclipse Magnetics — ferrite datasheet (C-class values)