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| JIS G 3521 | Spring Steel Wire | ||
| Diameter | Tensile Strength(N/mm2) | ||
| SW-A | SW-B | SW-C | |
| 0.16 | 1912-2206 | 2206-2550 | 2550-2893 |
| 0.18 | 1912-2206 | 2206-2501 | 2501-2844 |
| 0.2 | 1912-2206 | 2206-2501 | 2501-2795 |
| 0.23 | 1863-2158 | 2158-2452 | 2452-2749 |
| 0.26 | 1814-2108 | 2108-2403 | 2403-2697 |
| 0.29 | 1765-2059 | 2059-2354 | 2354-2648 |
| 0.32 | 1716-2010 | 2010-2305 | 2305-2599 |
| 0.35 | 1716-2010 | 2010-2305 | 2305-2599 |
| 0.4 | 1667-1961 | 1961-2256 | 2256-2550 |
| 0.45 | 1618-1912 | 1912-2206 | 2206-2501 |
| 0.5 | 1518-1912 | 1912-2206 | 2206-2501 |
| 0.55 | 1569-1863 | 1863-2158 | 2158-2452 |
| 0.6 | 1569-1814 | 1814-2108 | 2108-2403 |
| 0.65 | 1569-1814 | 1814-2108 | 2108-2403 |
| 0.7 | 1520-1765 | 1765-2059 | 2059-2354 |
| 0.8 | 1520-1765 | 1765-2010 | 2010-2305 |
| 0.9 | 1520-1765 | 1765-2010 | 2010-2256 |
| 1 | 1471-1716 | 1716-1961 | 1961-2206 |
| 1.2 | 1422-1667 | 1667-1912 | 1912-2158 |
| 1.4 | 1373-1618 | 1618-1863 | 1863-2108 |
| 1.6 | 1324-1569 | 1569-1814 | 1814-2059 |
| 1.8 | 1275-1520 | 1520-1765 | 1765-2010 |
| 2 | 1275-1471 | 1471-1716 | 1716-1961 |
| 2.3 | 1226-1422 | 1422-1667 | 1667-1912 |
| 2.6 | 1226-1422 | 1422-1667 | 1667-1912 |
| 2.9 | 1177-1373 | 1373-1618 | 1618-1863 |
| 3.2 | 1177-1373 | 1373-1569 | 1569-1814 |
| 3.5 | 1177-1373 | 1373-1569 | 1569-1765 |
| 4 | 1177-1373 | 1373-1569 | 1569-1765 |
| 4.5 | 1128-1324 | 1324-1520 | 1520-1716 |
| 5 | 1128-1324 | 1324-1520 | 1520-1716 |
| 5.5 | 1079-1275 | 1275-1471 | 1471-1667 |
| 6 | 1030-1226 | 1226-1422 | 1422-1618 |
| 6.5 | 1030-1226 | 1226-1422 | 1422-1618 |
| 7 | 981-1177 | 1177-1373 | 1373-1569 |
spring steel wire