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| Grade | ISO application | grain size | Colbalt content | density g/cm³ | hardness(HRA) | bending strength | Application |
| JT204N | K10-K20 | 0.2 | 9 | 14.4 | 94.0 | 3800 | Super fine grain produced by H.C.Starck gives JT204N better bending resistance. JT204N is suitable for PCB micro-milling cutter, diameter of which is less than 0.4mm micro-milling cutter, as well as milling of high hard steel above 60HRC. |
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| JT104U | K05-K10 | 0.4 | 6.5 | 14.72 | 94.0 | 3800 | Fine grain produced by H.C.Starck gives JT104F better bending resistance. JT104F is suitable for PCB micro-milling cutter, diameter of which is less than 0.8mm micro-milling cutter. |
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| JT104F | K05-K10 | 0.6 | 6 | 14.85 | 93.5 | 3500 | Super fine grain produced by H.C.Starck and low cobalt content gives JT104F high hardness and better heat conductivity.Suitable for general aluminum semi-finishing and finishing processing. |
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| JT404U | K30-K40 | 0.5 | 12 | 14.14 | 92.8 | 4200 | Fine grain produced by H.C.Starck gives JT404U the combination of good wear-resistance and bending resistance. JT404U is suitable for universal processing of steel (below HRC45) . |
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| JT304F | K20-K30 | 0.7 | 10 | 14.45 | 91.7 | 4000 | Fine grain produced by H.C.Starck gives JT304F the combination of good wear-resistance and bending resistance. JT304F is suitable for universal processing of steel (below HRC45) . |
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| JT304 | K20-K30 | 0.8 | 10 | 14.45 | 91.5 | 3800 | Fine grain produced by H.C.Starck gives JT304F the combination of good wear-resistance and bending resistance. JT304F is suitable for universal processing of steel (below HRC45) . |
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| JT404F | K30-K40 | 0.6 | 11.5 | 14.14 | 92.8 | 4100 | Fine grain produced by H.C.Starck gives JT404F the combination of good wear-resistance and bending resistance. JT404 is suitable for universal processing of steel ( HRC:45-55) . |
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