Used on sonar an/bqq-5 and 6. 2a thread class right-hand 0.329" thread length fillister countersunk head style 24 thread quantity per inch oxide screw surface treated unc thread series
3a thread class right-hand 0.532" thread length flat countersunk head style 32 thread quantity per inch passivate screw surface treated unjc thread series
Used on tf33-p7a. 3a thread class right-hand 1.375" thread length square extended washer head style 20 thread quantity per inch head drilled depth 0.190" unjf thread series