M6 thread class right-hand 8.5mm thread length hexagon extended washer head style 10 thread quantity per inch phosphate surface treated m thread series
3a thread class right-hand 0.444" thread length dished hexagon head style 0.070" hole diameter 1.302" grip length 24 thread quantity per inch unjf thread series
Used on patriot missle system. 3a thread class right-hand 0.425" thread length knurled no. 5 head style 32 thread quantity per inch stud material class 300 series steel; primary washer wave shaped 2 required anodize head surface treated unc thread series