Abstract: A mounting hub for securing an abrasive grinding wheel to a grinding machine spindle, the hub being formed in a single, integral piece of polymer plastic material. Flanges on each wheel face grip the wheel faces, and a mounting projection provides a spindle bore for receiving the grinding machine spindle. The hub is molded directly on the wheel, resulting in the formation of an interpenetration zone at the hub/wheel interface, in which the abrasive material of the wheel and the polymer plastic material intermix and mesh, producing a strong, durable bond.