Zhoushan Jianghai Screws Manufacture Co., Ltd [China]

Diameter：Φ15-Φ300

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.