3a thread class right-hand 1.120" grip length 28 thread quantity per inch 95000 double pounds per square inch shear strength aluminum surface treated unjf thread series
3a thread class right-hand 0.764" thread length flat chamfer head style 18 thread quantity per inch self-locking cadmium surface treated unc thread series
Used on C-17. 3a thread class right-hand 2.9325" grip length 18 thread quantity per inch rivet is also internally left hand threaded in 0.320 inch max, 0.3125-24 unjf-3b aluminum surface treated unjf thread series