Used on engine,wisconsin motor corp.,model 4h4d. 16 thread quantity per inch includes 0.375 in. lockwashers, 6 ea., and shim, 1 ea., round unc thread series
8.750" outside diameter 20 thread quantity per inch 4.000 by 5.000 in. dia bolt center; corner bevel dimension 0.047 in. by 30 deg; raised surface with round counterbored aperture oxide surface treated unc thread series