"THE BORE DOES NOT EXTEND THROUGH BUT IS PARTIAL ON HUB END ONLY; HUB IS EXTERNALLY SPLINED, 44 SPLINES, 30 DEG. PRESSURE ANGLE, 3.175"" MINOR DIA. AND 3.576"" MAJOR DIA., 12/24 PITCH; RAISED FACE IS STEPPED, END IS 5"" DIA. AND 0.411"" THICK; UNTHREADED BORE DIA.:0.531"" MIN., 0.539"" MAX.; RAISED FACE THICKNESS:0.880"" NOM.; POSITIONING FACILITY BOLT CIRCLE DIA.:9"" NOM.; POSITIONING FACILITY QTY:15; POSITION HOLE STYLE:PLAIN; BORE COUNTERBORE FEATURE:NOT INCLUDED; KEYING FACILITY:NOT INCLUDED; O/A OUTSIDE DIMENSION:9.875"" NOM.; HUB OD:3.745"" MIN., 3.750"" MAX.; RAISED FACE DIA.:5.500"" NOM.; THREAD PROVISION:THREADED; THREAD SIZE DESIGNATOR:5/8-18; FLANGE THICKNESS:1"" NOM."