"1+ TAPERED HUB,FACE OF HUB 1-3/4 IN. END OF HUB 1-1/2 IN.; COUNTERBORE DIAMETER: 1.125 IN. NOMINAL; COUNTERBORE DEPTH: 0.438 IN. NOMINAL; DISTANCE FROM CENTER OF BORE TO BOTTOM OF KEYWAY: 0.46875 IN. NOMINAL; FLANGE WIDTH: 1.250 IN. NOMINAL; HUB DIAMETER: 1.500 IN. NOMINAL; 1 KEYING FACILITY PROVIDED; KEYING FACILITY WIDTH: 0.188 IN. NOMINAL; KEYING FACILITY LENGTH: 1.062 IN. NOMINAL"