"COUNTERBORE DIAMETER: BOTH ENDS, 1.625 IN. NOMINAL; COUNTERBORE DEPTH: FIRST END, 0.875 IN. NOMINAL; SECOND END, 1.000 IN. NOMINAL; DISTANCE FROM CENTER OF BORE TO BOTTOM OF KEYWAY: FIRST END, 0.785 IN. NOMINAL; SECOND END, 0.630 IN. NOMINAL; 1 KEYING FACILITY EACH END; KEYING FACILITY WIDTH: FIRST END: 0.312 IN. NOMINAL; SECOND END, 0.250 IN. NOMINAL; KEYING FACILITY LENGTH: FIRST END, 1.937 IN. NOMINAL; SECOND END, 2.437 IN. NOMINAL"