"COUPLING IS MAGNESIUM; BODY KEYING FACILITY DEP/HT:0.420"" NOM.; BORE COUNTERBORE FEATURE:NOT INCLUDED; KEYING FACILITY QTY:1; HUB OD:2"" NOM.; THREAD PROVISION:UNTHREADED; DISTANCE FROM CENTER OF BORE TO BOTTOM OF KEYWAY:0.688"" NOM.; KEYWAY WD:0.250"" NOM."