3a thread class right-hand 1.9370" overall length 0.2495" bore diameter 24 thread quantity per inch chromium inner member surface treated ball type unf thread series
3a thread class left-hand 3.6870" overall length 0.3745" bore diameter 20 thread quantity per inch NAS559 std keyway in shank passivate inner member surface treated ball type unf thread series
30.0mm overall width 35.0mm bore diameter pair of bearings for duplex mounting with unsealed faces together 92a non-loading groove, non-separable, tandem mounting