3a thread class right-hand 0.614" thread length flat chamfer head style 0.047" hole diameter 32 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.440" thread length flat chamfer head style 0.046" hole diameter 28 thread quantity per inch cadmium surface treated unjf thread series
Used on aircraft,tomcat f-14. 3a thread class right-hand 0.306" thread length flat countersunk head style 32 thread quantity per inch unc thread series