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This Electric Operator Kit (EO Kit) is designed with everything needed to prepare Janus model 1950 rolling steel doors for an electric jackshaft operator. Included in the kit is a 42 tooth sprocket designed for use with a 9-1/2 inch diameter #41 (bicycle style) chian, struts, spacers, fasteners, and cam action tensioner. Mounting these parts to Janus Model 1950 mini warehouse or rolling steel door will make it compatible for mounting an electric garage door operator to open the door via the bicycle chain.
Bolt spacing pattern: 4-1/2 inches
Diameter including teeth: 7-7/8 inches
Inside diameter of center hole: 3 inches
Thickness: 3/16 inches