3a thread class right-hand flat countersunk undercut head style 0.307" grip length 9300 double pounds per square inch shear strength grit blast top of head. o-ring, synthetic rubber per mil-r-6855, class 1, 2, unjf thread series
Used on truck, cargo, dropside. 2a thread class right-hand 0.750" thread length hexagon extended washer head style 13 thread quantity per inch phosphate surface treated unc thread series
3a thread class right-hand 0.578" thread length flat countersunk head style 0.865" grip length 24 thread quantity per inch aluminum surface treated unjf thread series
3a thread class right-hand 0.578" thread length flat countersunk head style 1.428" grip length 24 thread quantity per inch aluminum surface treated unjf thread series
2a thread class right-hand 0.215" thread length pan head style 32 thread quantity per inch iron alloy 660 is heat treat to 24 - 37 hrc, steel comp 615 heat treat to 32 - 38 hrc, or steel 630 heat treat to 31 - 39 hrc passivate surface treated unc thread series
