Main SPECIFICATION
| standard | AISI DIN |
| grade | ck67 ck75 sae1070 sae1074 c67s c75s |
| thickness | 0.20-2.5mm |
| width | 4-60mm |
| technique | cold rolled annealed hardened and tempered |
| hardness | 18-55HRC |
| color | white blue grey-blue grey navy |
| surface | polished-blue,polish-white ,bright,unpolish |
| edge | rounded slited |
| coil ID | 300-500mm |
| coil OD | 800-1000mm |
| tensile strength | 540-1275N/mm2 |
| yield trength | 370-1175N/mm2 |
| tolerance on thickness | +/-0.01mm max |
| tolerance on width | +/-0.05mm max |
| application | roller door spring,shutter spring,coil spring,spring in roll |
| package |
each bundle with anti-rust paper and light oil then plastic film with metallic pallet. |
