"DISTANCE FROM CENTER OF BORE TO BOTTOM OF KEYWAY: FIRST END, 1.593 IN. NOMINAL AND SECOND END, 0.937 IN. NOMINAL; FLANGE WIDTH: 3.800 IN. NOMINAL; HUB DIAMETER: 9.250 IN. NOMINAL; 1 KEYING FACILITY PROVIDED AT EACH END; KEYING FACILITY WIDTH: FIRST END, 0.625 IN. NOMINAL; SECOND END, 0.375 IN. NOMINAL"