Used on aircraft,ac-130u. 3a thread class right-hand 1.250" thread length chamfer flange head style 20 thread quantity per inch screw, cap, socket head unrf thread series
Used on australian government. 3a stud thread thread class 0.500" stud thread thread length 1.375" overall length 18 stud thread thread quantity per inch item has opposite side thread series designator of nf, with diameter OF0.312", threads per inch of 24, cadmium surface treated unc stud thread thread series
3a thread class right-hand 0.750" thread length hexagon head style 24 thread quantity per inch head also chamfer like with 100 degree angle; source control drawing unjf thread series
Used on ac-130u. 3a thread class right-hand 1.041" thread length dished hexagon head style 1.816" grip length 16 thread quantity per inch cadmium surface treated unjf thread series
2a thread class right-hand 0.625" thread length flat countersunk head style 40 thread quantity per inch material 18-8 stainless steel with flat slotted head unc thread series
Used on ac-130u. 3a thread class right-hand 0.578" thread length dished hexagon head style 1.688" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.425" thread length dished hexagon head style 2.250" grip length 28 thread quantity per inch passivate surface treated unjf thread series