screw, cap, socket head; steel; 0.312-4, unrf-3a rh thd, 0.560 in. nom screw thd lg, 2.560 in. nom fastener lg, C38 min, C45 max o/a rockwell hardness; 190000 psi min tensile, 170000 psi min yield strength; 0.457 in. min, 0.468 in. max hd dia, 0.306 in. min, 0.312 in. max hd h, 30 deg nom champfer angle; 0.250 in. nom w across flats
3a thread class right-hand flush countersunk head style 0.812" grip length 28 thread quantity per inch 10490 double pounds per square inch shear strength unjf thread series
2a thread class right-hand 0.220" thread length flat countersunk head style 40 thread quantity per inch cadmium screw surface treated unjc thread series
3a thread class right-hand 0.714" thread length flat countersunk head style 56 thread quantity per inch passivate screw surface treated unjc thread series
3a thread class right-hand 0.381" thread length flat countersunk head style 0.802" grip length 28 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.693" grip length 32 thread quantity per inch 95000 single pounds per square inch shear strength color green on thread end cadmium surface treated unjf thread series
3a thread class right-hand flush countersunk head style 0.563" grip length 32 thread quantity per inch 108000 single pounds per square inch shear strength cadmium surface treated unjc thread series
3b thread class right-hand flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.062" grip length 32 thread quantity per inch 125000 single pounds per square inch shear strength furnished without bolt cadmium expander surface treated unjf thread series
3a thread class right-hand 0.476" thread length flat countersunk head style 0.552" grip length 24 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.650" thread length flat countersunk head style 2.240" grip length 20 thread quantity per inch cadmium surface treated unjf thread series
3a thread class right-hand 0.438" thread length flat countersunk head style 0.365" grip length 24 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.320" thread length hexagon head style 0.865" grip length 32 thread quantity per inch cadmium surface treated unf thread series
3a thread class right-hand 1.110" thread length flat chamfer head style 0.044" hole diameter 20 thread quantity per inch cadmium surface treated unrc thread series
