〒590-0982 大阪府堺市堺区海山町３丁158番地
SKK rod tubes are available in short length to long length, and used for the manufactures of rollers, rod tubes for construction machines etc.
1.Injurious flaws of mother tubes are removed prior to cold drawing process.So that shortening the time of grinding process contributes to the cost saving.
2.Lengthy tubes are available.
3.Decrease the material loss due to less grinding substances.
4.Heavy adjustment is possible by cold drawing process and material costs become lower as you need not to use high tensile steels.
5.Seamless or electric resistance welded tubes are available.
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 |
