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L/D Ratio：L/D=15-46
Surface Roughness：Ra 0.4μm
Nitriding Layer Depth: 0.5～0.8mm
Nitriding Fragility：Less than Grade One
Nitriding Layer Hardness: 900～1000HV
Cr-Plating Layer Depth: 0.05~0.10mm
Cr-Plating Layer Hardness: HV＞850
Bimetallic Layer Depth: 1.2~2.5mm
Bimetallic Layer Hadness: HRC＞65
Types of screws: ordinary type, gradient type, mutant type, barrier type, pin type, DIS open bar Merry, exhaust type, BM, separate type. Compression ratio, the number of screw head and the type of barrel can be designed according to users’ requirements.
