| spare parts type | screw barrel | material | 38CrMoAIA,SACM645,AISI4140,SKD61,GHII3 |
| machinery test report | Provided | video outgoing-inspection | Provided |
| key selling points | Long Service Life | Weight (KG) | 300 |
| screw material | 38CrMoAIA,SACM645,AISI4140,SKD61,GHII3 | NITRIDING hardness | HV900-1000 |
| nitriding depth | 0.5~0.8mm | quenching hardness | HRC55-62 |
| nitriding brittle | less than grade 2 | surface roughness | Ra 0.4 Um |
| screw straightness | 0.015mm | after nitriding hard chrome plated | HV>=950HV |
| chrome plating thickness | 0.05-0.10MM | alloy depth | 2.0-3.0MM |