〒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 | 0.040max |
| SKK original standards | SKCY510 | 0.25max | 0.35max | 0.30〜0.90 | 0.040max | 0.040max |
| SKCY540 | 0.17〜0.25 | 0.35max | 0.30〜0.90 | 0.040max | 0.040max | |
| SKCY590 | 0.17〜0.25 | 0.35max | 0.60〜0.90 | 0.040max | 0.040max | |
| SKCY690 | 0.17〜0.22 | 0.80max | 1.65max | 0.035max | 0.035max | |
2.Mechanical properties
| Grade | Tensile strength (N/mm2) | Yield point (N/mm2) | Elongation (%) | |
| JIS | STKM13C | 510min | 380min | 15min |
| SKK original standards | SKCY510 | 510min | 380min | 15min |
| SKCY540 | 540min | 430min | 15min | |
| SKCY590 | 590min | 490min | 15min | |
| SKCY690 | 690min | 590min | 15min | |
3.Tolerances for dimensions （ｍｍ）
| Inside diameter | Tolerance for inside diameter | Wall thickness | Tolerance for wall thickness | length |
| 〜50 | +0.20 +0.50 | 〜10 | ±10% | 〜6,000 |
| 51〜80 | +0.20 +0.60 | 〜10 | 〜8,000 | |
| 81〜120 | +0.30 +0.80 | 〜15 | 〜10,000 | |
| 121〜160 | +0.40 +1.00 | 〜20 | 〜10,000 | |
| 161〜200 | +0.60 +1.00 | 〜20 | 〜10,000 | |
| 201〜260 | +0.80 +1.00 | 〜20 | 〜10,000 |
