Screw is made of high quality alloy steel, after precision machining, and tempering and nitriding treatment, which has the best hardness and corrosion resistance, the special designed screw with forced conveying bushing, reasonable structure, stable performance, good plasticizing, high yield, low energy consumption, stratification is clear, is the production of high strength, ageing resistance, no drops, pervious to light, heat preservation functional membrane ideal choice.

For different plastic ratio screw can be selected: ordinary type, pin type, barrier type, separation type, wave type, etc.

Material: 38 crmoala

Process: nitriding and bimetallic

Nitriding depth: 0.5mm-0.7mm

Bimetallic screw: alloy layer hardness HRC>60

Nitriding layer hardness: HV960-1100

Alloy layer depth: 2~2.5

Screw straightness: 0.015mm

Chrome plated screw: Chromium layer thickness: 0.03-0.06mm

Surface finish: 0.04Ra/um~0.08Ra/um

Nitride brittleness: less than grade 2

Aspect ratio: 1: (25~35)