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Diameter: ¦Õ45-¦Õ200 £¨according to the demands of customers)
L/D ratio:16-35
The compression ratio of screws can be designed according to different products and mixtures.
Technical Parameter:
Hardness After Hardening & Tempering:HB280-320
Nitrided hardness: 950-1100HV 
Nitrided layer depth:0.50-0.80mm
Nitrided brittleness: Less than 2 level
Surface roughness: Ra 0.4¦Ìm
Linearity of screw: 0.015mm/m
Bimetallic layer depth: ¡Ý3mm
Bimetallic hardness: HRC60-72
Hard-chrome plating hardness after nitriding: ¡Ý950HV
Chrome-plating layer depth: 0.025~0.10mm