Ø15-Ø250
Length/Diameter Ratio:15~45
Screw can be selected from ordinary,gradual,
mutational,pinned,shielding,separating and exhausting types.

The compression ratio of the screw can be designed according to different products and mixtures.

TECHNICAL SPECIFICATIONS:

Material : Quality 38CrMoAlA
Hardness After Hardening & Tempering : HB240-280
Nitrided Hardness : HV850-1000
Nitrided Case Depth: 0.45~0.7mm
Nitrided Brittleness: Less Than Grade 2
Surface Roughness: Ra 0.4
Screw Straightness: 0.015mm
Surface Chromium-Plating's Hardness After Nitriding:≥900HB
Chromium-Plating Depth: 0.05~0.10mm
Alloy Hardness: HRC50-65
Alloy Depth: 0.8~2.0mm