Rubber screw barrel

Pin Screw and Barrel Specification: Ø75mm~Ø200mm 

Cold/Heat Feed Screw Specification: Ø65mm~Ø650mm

Technical Parameter:

Hardness After Hardening & Tempering:HB280-320

Nitrided hardness: HV 850-1000

Nitrided layer depth:0.50-0.80mm

Nitrided brittleness: ≤ Grade Ⅱ

Surface roughness: Ra 0.4μm

Linearity of screw: 0.015mm

Bimetallic layer depth: ≥2mm

Bimetallic hardness: HRC60-72

Hard-chrome plating hardness after nitriding: ≥900HV

Chrome-plating layer depth: 0.025-0.10mm