3a thread class right-hand 0.525" thread length hexagon head style 1.850" grip length 28 thread quantity per inch passivate surface treated unjf thread series
3a thread class right-hand 0.667" thread length double hexagon extended washer head style 0.060" hole diameter 24 thread quantity per inch unjf thread series
Used on f-100/200/220 engine. 3a thread class right-hand 0.398" thread length double hexagon w/hole head style 32 thread quantity per inch unjf thread series
right-hand round w/wrench flats chamfered head style 13 thread quantity per inch one in. sleeve attached to bolt by 5/16-24 left hand thread 5/32 in. deep that must swivel freely unc thread series