2a thread class right-hand 0.089" thread length flat countersunk undercut head style 56 thread quantity per inch passivate screw surface treated altered item drawing from p/n's MS51959-1 unc thread series
3a thread class right-hand flush countersunk head style 1.557" grip length 16000 double pounds per square inch shear strength part number indicates collar/rivet combination cadmium surface treated unjf thread series
3a thread class right-hand flush countersunk head style 1.307" grip length 10400 double pounds per square inch shear strength part number indicates rivet/collar combination cadmium surface treated unjf thread series
3a thread class right-hand flush countersunk head style 1.558" grip length 17600 double pounds per square inch shear strength come with collar cadmium surface treated unjf thread series
3a thread class right-hand flush countersunk head style 1.557" grip length 14600 double pounds per square inch shear strength part number indicates rivet/collar combination cadmium surface treated unjf thread series
3a thread class right-hand flush countersunk head style 1.370" grip length 10490 double pounds per square inch shear strength part number indicates rivet/collar combination cadmium surface treated unjf thread series