3b thread class right-hand 1.4060" overall length 0.1895" bore diameter 32 thread quantity per inch chromium inner member surface treated ball type unf thread series
3a thread class right-hand 2.3280" overall length 0.3020" bore diameter 24 thread quantity per inch cadmium surface treated ball type unf thread series
0.2500" first hole diameter 3.1560" overall length 5/16-24 unf class 2b thread tapped in drilled hole, midway between two closest oil holes, countersunk on both sides 17c solid, plain, no outside flanges