Specification:
Screw diameter: d15- d 300
L/d ratio: 15-46
Product classification:
Aiming at different plastic products the screw can be chosen from: general type, pin type, barrier type, separation type, and gas-exhausting type, etc.

Base materials:
(1)38crmoala(jis sacm645)
(2)42crmo(aisi 4140)
(3)4cr5mosi v1 (jis skd-61)
(4)9cr18mov
(5)hpt

Bimetallic alloy materials:
1)fe-based alloy
2)ni-based alloy/deloro alloy
3)co-based alloy
4)nico-based alloy
5)tungsten carbide/wolfram carbide

Technics:
Heat treatment
High-frequency quenching
Nitriding treatment
Hard-chrome electroplating
Bimetallic alloy welding
Bimetallic alloy centrifugal casting

Technical parameter:
Nitrided layer depth: 0.5-0.8mm
Nitrided hardness: 900-1000hv
Nitrided brittleness: less than grade 1
Surface roughness: ra0.4
Linearity of screw: 0.015mm
Hard-chrome plating hardness after nitriding: >950hv
Chrome-plating layer depth: 0.025-0.085mm
Bimetallic layer depth: 3mm



Slushing oil coated& film wrapped in wooden case