3a thread class right-hand 2.3125" overall length 0.3120" bore diameter 24 thread quantity per inch stamped with letter m on shank to show aircraft use; 100 pct magnetic inspected chromium inner member surface treated ball type unf thread series
3b thread class right-hand 1.7655" overall length 0.2495" bore diameter 28 thread quantity per inch with magnetic inspection stamp on shank to show aircraft use 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 magnaflux inspected; stamped with letter m chromium inner member surface treated ball type unf thread series