flush (flat) countersunk (included angle - less than 135 deg w or w/o chamfer) head style 0.631" grip length 49000 single pounds per square inch shear strength
3a thread class right-hand 0.844" thread length flat countersunk head style 20 thread quantity per inch passivate screw surface treated unf thread series
3a thread class right-hand 0.500" thread length double hexagon extended washer head style 0.875" grip length 24 thread quantity per inch heat treat to 260 ksi ftu; temperature limit 900 deg f cadmium grip surface treated unjf thread series
3a thread class right-hand 0.431" thread length double hexagon extended washer head style 0.750" grip length 28 thread quantity per inch heat treat to 260 ksi ftu; temperature limit 900 deg f cadmium grip surface treated unjf thread series
3a thread class right-hand flush countersunk head style 0.689" grip length 32 thread quantity per inch 108000 single pounds per square inch shear strength cadmium surface treated unjc thread series
3a thread class right-hand 0.634" thread length flat countersunk head style 1.875" grip length 20 thread quantity per inch passivate surface treated unjf thread series