Bell & Gossett 311KD Replacement Ball Bearing

Bell & Gossett 311KD Replacement Ball Bearing (part number 186571) is the pump-end bearing used in Bell & Gossett Series 1510 and E-1510 end-suction pumps. The 311KD designation refers to a radial/deep groove ball bearing with a straight bore of 55 mm, an outer diameter of 120 mm, and a width of 29 mm, furnished as a single-shielded unit without a snap ring. Retail listings identify this part as the 186571 replacement bearing for Series 1510 and E-1510 pumps, with some sources noting it as discontinued by certain distributors. This bearing is intended for replacement of the pump-end assembly in the specified Bell & Gossett pump families, providing a direct, compatible option when the original bearing shows wear or noise.