3b thread class right-hand 1.2810" overall length 0.1895" bore diameter 32 thread quantity per inch chromium inner member surface treated ball type unef thread series
3a thread class right-hand 1.2810" overall length 0.1895" bore diameter 28 thread quantity per inch chromium inner member surface treated ball type unf thread series
3a thread class right-hand 2.9690" overall length 0.3120" bore diameter 20 thread quantity per inch chromium inner member surface treated ball type unf thread series