4G6g 1st end thread class thread series designator aerospace iso-mj profile ansi B1.21m with 2 lockwire holes 1.5mm dia, second end 26.87mm id passivate surface treated
4H5h 1st end thread class thread series designator aerospace iso-mj profile ansi B1.21m with 2 lockwire holes 1.5mm dia; second end 26.87mm id passivate nut surface treated