〒590-0982 大阪府堺市堺区海山町３丁158番地
1.Chemical composition
| Grade | C | Si | Mn | P | S | |
| JIS | STKM13C | 0.25max | 0.35max | 0.30〜0.90 | 0.040max | 0.010max |
| SKK original standards | SKCY510E | 0.25max | 0.35max | 0.30〜0.90 | 0.040max | 0.010max |
| SKCY540E | 0.17〜0.25 | 0.35max | 0.60〜0.90 | 0.040max | 0.010max | |
| SKCY590E | 0.17〜0.25 | 0.35max | 0.60〜0.90 | 0.040max | 0.010max | |
2.Mechanical properties
| Grade | Tensile strength (N/mm2) | Yield point (N/mm2) | Elongation (%) | |
| JIS | STKM13C | 510min | 380min | 15min |
| SKK original standards | SKCY510E | 510min | 380min | 15min |
| SKCY540E | 540min | 490min | 15min | |
| SKCY590E | 590min | 490min | 15min | |
3.Tolerances for dimensions (mm)
| Inside diameter | Tolerancefor inside diameter | Wall thickness | Tolerance for wall thickness | Roundness | Straightness |
| 〜40 | +0 −0.10 | 〜7.5 | ±8% | 0.05max | 0.5/1000 |
| 41〜60 | +0 −0.15 | 〜7.5 | 0.08max | ||
| 61〜100 | +0 −0.20 | 〜9.5 | 0.10max | ||
| 101〜150 | +0 −0.30 | 〜12.5 | 0.15max | ||
| 151〜200 | +0 −0.50 | 〜15.0 | 0.20max |
Tolerances for inside diameter of burnishing will be considered upon request.
