Product Description

Diameter:φ**-φ**0 Ratio of Length to Diameter :*5～*5 Material: Alloy-Steel of High-quality (1) *8CrMoAlA (JIS SACM**5) (2) *2CrMo (AISI ***0) (3) 4Cr5MoSiV1 (JIS SKD**1) Heat-treatment: （1） Nitriding treatment （2） Electroplated hard-chrome （3） High-frequency quenching （4） Spray coating Bimetallic-alloy （5） Vacuum quenching Main technical specifications:: Technical: Nitriding treatment, alloy coating spraying, heating treatment, screw fully hardening, Hardness After Hardening & Tempering : ******0 HV Nitrided Hardness : *******0 HV Nitrided Case Depth: 0. 5~0.8mm Nitrided Brittleness: Less Than Grade 2 Surface Roughness: Ra 0.4um/m Screw Straightness: 0.**5mm/m Surface Chromium-Plating''s Hardness After Nitriding:≥**0HV Chromium-Plating Depth: 0.*5~0.*0mm Alloy Hardness: HRC*0°**5° Alloy Depth: 0.8~2.0mm Screw can be selected from ordinary, gradual, mutational, pinned, shielding, separating and exhausting types. The compression ratio of screw can be desingned according to different raw material-s and requirements of clients.