3a thread class right-hand 0.750" thread length hexagon head style 28 thread quantity per inch head shall be marked as describedin sae J429.raised markings are pre ferred, depressions are acceptable; shall meet requirements for surface discontinuities as specified in ff-s-85 oxide surface treated unf thread series
2a thread class right-hand 1.236" thread length hexagon head style 0.094" hole diameter 13 thread quantity per inch cadmium surface treated unc thread series