A threaded sink flange assembly for a food waste disposer includes a threaded sink flange, a sink flange nut, an upper mounting flange and a retainer. The threaded sink flange has a tubular body portion that has an externally threaded portion and a plurality of radially outwardly projecting mounting ledges with gaps therebetween. The sink flange nut is internally threaded with threaded portions interspersed with gaps, there being at least a gap corresponding to each mounting ledge. The upper mounting flange is annular having a top ring with a plurality of radially inwardly extending mounting projections. The mounting projections are received on the mounting ledges when the upper mounting flange is assembled to the threaded sink flange. A plurality of flanges extend from a bottom of an outer wall of the upper mounting flange with each flange having a radially outwardly extending inclined mounting ramp.