3a thread class right-hand 3.1875" overall length 0.3745" bore diameter 20 thread quantity per inch chromium inner member surface treated ball type unf thread series
3a thread class right-hand 1.5200" overall length 0.2495" bore diameter 28 thread quantity per inch shank stamped w/letter /m) magnafluxed chromium inner member surface treated ball type unf thread series
3a thread class right-hand 1.9370" overall length 0.2495" bore diameter 24 thread quantity per inch vlose fit radial clearance, magnetic inspection required chromium inner member surface treated ball type unf thread series