Product overview：
Specifications:
Screw diameter: 15-300
Length diameter ratio: 15-46
Product type:
Screw for different plastic products can be selected: common type, pin type, barrier type, separation type, exhaust type, etc
Base material:
1)38CrMoAlA(JIS SACM645)
2)42CrMo(AISI 4140)
Treatment process:
heat treatment
Nitriding treatment
Technical parameters:
Nitriding depth: 0.50mm-0.80mm
Nitriding hardness: 900-1000hv
Nitriding brittleness: < grade 1
Surface roughness: RA 0.4
Straightness of screw: 0.015mm
Hardness of surface chromium plating layer after nitriding: ≥ 950hv
Thickness of chromium plating layer: 0.025 ~ 0.085mm
Double alloy depth: 3mm
