General Specifications for NRG COMPANY, INCORPORATED Screw Conveyors Part 2 - Products 2.1 Stainless Auger   Auger to be 18-8 stainless steel. 18" dia. sectional flight screws with 18" pitch flights, 3/8" stainless steel mounted on 4" pipe with bushed ends for 3-7/16 dia. shafts. Both pipe ends fitted with "quick links" and drilled for two coupling bolts on each end. Flighting will be continuous welded both sides.