Used on C-17. 3a thread class right-hand 0.245" grip length 28 thread quantity per inch 95000 double pounds per square inch shear strength pin-rivet, threaded aluminum surface treated unjf thread series
3a thread class right-hand fillister head style 32 thread quantity per inch two longitudinal slots in threads passivate surface treated unc thread series
2a thread class right-hand 0.240" thread length flat chamfer head style 28 thread quantity per inch steel comp 18-8 passivate surface treated unc thread series