3a thread class right-hand 0.304" thread length flat countersunk head style 28 thread quantity per inch cadmium screw surface treated unjf thread series
2a thread class right-hand 0.844" thread length 3.995" overall length 20 thread quantity per inch navy special project two undercut areas in shank phosphate zinc surface treated ball unf thread series
3a thread class right-hand 1.505" grip length 28 thread quantity per inch 95000 single pounds per square inch shear strength cadmium surface treated unjf thread series
Used on aircraft, eagle f-15;aircraft, b-1b. 3a thread class right-hand flush countersunk head style 1.255" grip length 28 thread quantity per inch 95000 single pounds per square inch shear strength unjf thread series
3a thread class right-hand 2.257" thread length flat chamfer head style 0.091" hole diameter 14 thread quantity per inch cadmium surface treated unrf thread series
3a thread class right-hand 0.137" thread length flat chamfer head style 16 thread quantity per inch cadmium fastener surface treated unrc thread series
2a thread class right-hand 0.247" thread length double chamfer head style 40 thread quantity per inch grip 1.625 in. nom lg; 0.135 in. min 0.145 in max dia; threads on shank 0.350 in. min 0.410 in. max lg; 0.190-32unf-2a; 96 dp raised diamond knurl head passivate surface treated unc thread series