3a external thread class right-hand external 0.712" overall length 16 external thread quantity per inch plug, tube fitting flareless (note: drilled hole is optional should not be considered as a separating characteristic un external thread series
Used on aircraft, eagle f-15 & stratolifter c-135. 3a 2nd end thread class 18 1st end thread quantity per inch weapon system essential passivate surface treated unjf 2nd end thread series