3a thread class left-hand 3.7500" overall length 0.7495" bore diameter 16 thread quantity per inch chromate inner member surface treated ball type unf thread series
3.220" outside diameter prior to assembling roller, chaincomponents into a chair assembly, lubewith mil-g-21164 grease, lightly coat mating face of roller; item part of truck assembly, driver, of the peacekeeper t&h plain