2a thread class right-hand 0.359" thread length fillister head style 0.031" hole diameter 80 thread quantity per inch passivate screw surface treated unf thread series
2b thread class right-hand flush countersunk head style 0.240" grip length 32 thread quantity per inch 95000 single pounds per square inch shear strength unjf thread series
2b thread class right-hand flush countersunk head style 0.177" grip length 32 thread quantity per inch 95000 single pounds per square inch shear strength unjf thread series
3a thread class right-hand 0.500" thread length double hexagon head style 1.990" grip length 24 thread quantity per inch navy special project cadmium surface treated unf thread series
Used on aircraft, galaxy c-5; aircraft, thunderbolt ii,a-10; aircraft,f-111. 3a thread class right-hand 0.516" thread length double hexagon head style 1.625" grip length 20 thread quantity per inch unjf thread series