3a thread class right-hand 2.8595" overall length 0.3745" bore diameter 20 thread quantity per inch keyway in shank chromium inner member surface treated ball type unf thread series
3a thread class right-hand 2.4380" overall length 0.3745" bore diameter 20 thread quantity per inch magnetic inspected chromium inner member surface treated ball type unf thread series
2b thread class right-hand 1.6870" overall length 0.2495" bore diameter 28 thread quantity per inch cadmium surface treated ball type unf thread series