2a thread class right-hand 0.970" thread length hexagon countersunk undercut head style 13 thread quantity per inch phosphate or phosphate zinc surface treated unc thread series
3a thread class right-hand 1.000" thread length hexagon head style 16 thread quantity per inch navy special project zinc surface treated unc thread series
2a thread class right-hand 2.750" thread length hexagon head style 13 thread quantity per inch unthreaded area of shank 0.060 in. length unc thread series
right-hand 2.000" thread length hexagon head style 13 thread quantity per inch main puller screw; incl in cumminsp/n st-1259 oil seal puller-installer service tool kit unc thread series