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