2a thread class right-hand 0.500" thread length flat countersunk head style 32 thread quantity per inch cadmium screw surface treated unc thread series
2a thread class right-hand 0.184" thread length flat countersunk head style 56 thread quantity per inch cadmium screw surface treated fleet ballistic missile quality as identified by quality control no. poso 912918 unc thread series
2a thread class right-hand 0.687" thread length hexagon head style 20 thread quantity per inch 3/64 in. radius under-cut at shoulder 1/32 in. by 45 deg chamfer at thd end zinc surface treated unf thread series
3a thread class right-hand 0.875" thread length hexagon head style 16 thread quantity per inch body externally relieved 0.630 in. by 1.000 in. from thd end cadmium or zinc surface treated unf thread series
3a thread class right-hand 0.750" thread length dee head style 24 thread quantity per inch undercut beneath head 0.062 in. wide by 0.362 in. min. 0.370 in. max dia unf thread series
