A member of the Wire Association International, Inc. since 1972.                           A lifetime member since 2004.
The standard plastic extruder screw typically exhibits the following characteristics:
 A Right Thread with Total Length of 20 to 30 D   A Feed Section Length of 4 to 8 D  A Metering Section Length of 6 to 10 D  A Flight Helix Angle (Pitch) at the I. D. of 17.66 Degrees  A Feed Section Channel Depth H of 0.15 to 0.20 D          The vast majority of extruder screws in service today fall within these design approximations.
A Total Number of Parallel Flight Designs of 1 A Flight Width of 0.1 D A Channel Depth Ratio (Compression) of 2 to 4