1. Commodity: hydraulic cylinder barrel
2. Steel Grade:
| DIN: | ST52,ST52.3,ST52.4 |
| EN: | E355,E410,E470,C45E, |
| JIS: | STKM 13A, STKM 13B,STKM 13C |
| GB: | 20#,45#,16Mn,25Mn |
| SAE/AISI: | 1020,1026,1045,1518,1524,1541 |
3. Size range: Bore of 40mm-400mm
4. Bore roughness: Ra0.25um max
5. Bore tolerance: H8 or H9
6. Machining,welding,turning as per drawing.