Used on F15S. 3a thread class right-hand flush countersunk head style 0.375" grip length 24 thread quantity per inch 95000 single pounds per square inch shear strength unjf thread series
3a thread class right-hand 0.307" grip length 5380 double pounds per square inch shear strength powder blast top of head, with color white on thread end. for repair work only, .0156 oversized part. unjf thread series
3a thread class right-hand 0.495" grip length 5380 double pounds per square inch shear strength powder blast top of head, with color white on thread end. for repair work only, .0156 oversized. unjf thread series
3a thread class right-hand 1.177" grip length 0.449 in. second shank diam.cetyl alcohol lubricant; used on F111a cadmium surface treated unjf thread series