Diameter: Φ35/35~Φ250/250 (according to the demands of customers)
L/D Ratio: L/D=16~35 (according to the demands of customers)
Nitriding layer depth: 0.5~0.8mm
Nitriding layer hardness: >950HV
Nitriding brittleness: <Grade two
Screw material: 38CrMoAlA, special alloy can be welded on the flight of screw.
Barrel material: 38CrMoAlA, import ed alloy steel can be used on feeding hole .
The compression ratio of screw can be designed according to different raw materials and requirements of clients.