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The Janus 42 Tooth Sprocket HDWR200093-0000 is designed for use with a #41 (bicycle-style) Roller Chain. The sprocket installs on the axle of a rolling door and connects to the garage door operator with the roller chain. Included as part of the Janus 1950 Electric Operator Kit (EO Kit).
Bolt Spacing Pattern of 4-1/2 inches
Diameter including teeth: 7-7/8 inches
Inside diameter of center hole: 3 inches
Thickness: 3/16 inches