When you’re reviewing a Chinese certificate or quote, the grade name is just the beginning. This cross-reference table helps you quickly see how common Chinese carbon steels compare to the ASTM, SAE, JIS, and ISO grades you already know—and what they’re typically used for in fastener applications.
| Chinese Grade | Property Class | ASTM/SAE | JIS | ISO | Best For… |
|---|---|---|---|---|---|
| Q195 | Class 4.6 | 1008 | SWRCH6A | C4C | Low-strength washers, non-critical |
| Q215 | Class 4.6 | 1010 | SWRCH8A | C4C | General light-duty |
| Q235 | Class 4.8 | 1015/1018 | SWRCH15A | C4C/C4D | General purpose bolts, nuts |
| ML08Al | Class 4.8 | 1018/10B18 | SWRCH18A | C10C | Self-drilling screws, small parts |
| ML10 | Class 4.8 | 1010 | SWRCH10R | C10C | Rivets, small fasteners |
| 10# | Class 4.8 | 1010 | S10C | C10 | General low-carbon |
| ML20 | Class 5.8 | 1020 | SWRCH22A | C22 | Medium formability |
| 20# | Class 5.8 | 1020 | S20C | C22 | General purpose |
| ML35 | Class 8.8 | 1035 | SWRCH35K | C35 | 8.8-grade bolts |
| 35# | Class 8.8 | 1035 | S35C | C35 | 8.8-grade, general machinery |
| ML40 | Class 8.8/10.9 | 1040 | SWRCH40K | C40 | Larger 8.8 bolts |
| 40# | Class 8.8/10.9 | 1040 | S40C | C40 | Medium-duty |
| ML45 | Class 8.8/10.9 | 1045 | SWRCH45K | C45 | Heavy-duty fasteners |
| 45# | Class 8.8/10.9 | 1045 | S45C | C45 | The workhorse 8.8 grade |
| 65# | Spring wire | 1065 | SUP2 | — | Spring washers, clips |
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