3a thread class right-hand 5.0930" overall length 0.7495" bore diameter 20 thread quantity per inch thd lg slotted londitudinall 0.1560 in. min 0.1610 in. max w. by 0.1000 in. 0.1050 in. max deep, thd end of shank drilled longitudinally 0.5000 in. dia by 0.7495 in. deep chromium inner member surface treated ball type unef thread series