General Specifications for NRG COMPANY, INCORPORATED Chain and Flight Skimmer Equipment Part 2 - Products 2.5-C Alternate Idler Sprockets - Static Shaft System   All collector sprockets on shafts other than the head shaft shall be supplied with static shaft bushings which eliminate the need for wall bearings. The static shaft bushings shall be machined from Oil Filled, Self Lubricated, Nylon material. Bushings shall be split to facilitate installation onto fixed shafting. The bushings shall include 1" thick flanges integral to the part eliminating the need for sprocket set collars.   The bushings shall include stainless steel retaining hardware or 316 ss clamping bands to keep the bushing/sprocket assembly at its proper location. The bushings shall be designed so that their corresponding sprockets rotate freely. Bushing flange walls shall be designed to allow for the proper clearance between the flange and the sprocket face on either side. Static bushings manufactured from materials other than oil filled nylon will not be acceptable.