"BORE IS 5.750-12UN-38RH AND LH THDS;HUB IS HEXAGON 8.000 ACROSS FLATS;SECURING HOLE CENTERED EACH HUB;THREE RAISED LIPS 1.000 WIDE,1.000 HIGH;COUPLING IS SINGLE PIECE; COUNTERBORE DIAMETER: 6.004 IN. NOMINAL; COUNTERBORE DEPTH: 2.120 IN. NOMINAL; FLANGE WIDTH: 14.760 IN. NOMINAL"