Used on f100 eng. 3a thread class right-hand 0.255" thread length square head style 28 thread quantity per inch shoulder is casehardened unf thread series
3a thread class right-hand 0.823" thread length round w/wrench flats head style 18 thread quantity per inch circumferential groove 0.140 in. wide, 1.946 from bearing surface of head carburized to rockwell c scale 50 to 60 hardness phosphate manganese or phosphate zinc surface treated unf thread series
2a thread class right-hand 0.406" thread length hexagon head style 16 thread quantity per inch thd relief 5/8 in. dia by 3/32 in. lg. end of bolt rd phosphate surface treated unf thread series
2a thread class right-hand 0.734" thread length hexagon head style 20 thread quantity per inch shoulder threaded 3/8-48ns-2a nickel surface treated unc thread series
2a thread class right-hand 0.760" thread length round w/wrench flats head style 10 thread quantity per inch 2 keyways located on shoulder, 180 deg. apart on centerline; threaded hole in center of head, 0.500-20unf-2b, 1.000 in. deep min. nickel or cadmium surface treated unc thread series
3a thread class right-hand 0.644" thread length hexagon head style 20 thread quantity per inch undercut under head 3/32 w by 0.610 in dia.; undercut under shoulder 3/32 in min unf thread series
3a thread class right-hand 1.708" thread length hexagon extended washer head style 12 thread quantity per inch cadmium surface treated unf thread series
2a thread class right-hand 0.906" thread length flat chamfer head style 24 thread quantity per inch head painted olive drab color no. 2430 mil-e-11857 passivate surface treated unf thread series
3a thread class right-hand 0.625" thread length hexagon head style 0.110" hole diameter 16 thread quantity per inch thd relief 3/16 in. lg, 19/64 in. dia at base of relief unc thread series
