3.5000" overall length flange has 3 csk 110 deg 0.250-20unc-2b thd holes spaced 120 deg apart on 2.375 in. dia mtg circle cadmium surface treated 22c solid, external flange one end
3a thread class right-hand 2.2020" overall length 0.1897" bore diameter 28 thread quantity per inch 80 pct full of specified lubricant; nas 513 keyway in shank cadmium all external/exposed metal surfaces surface treated double row, staggered, ball unjf thread series
3b thread class right-hand 3.7500" overall length 0.7495" bore diameter 16 thread quantity per inch chromium inner member surface treated ball type unf thread series