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#40 Chain Sprocket with 20 Tooth and 7/8" Finished Bore, Model #40BS20-7/8 Chain Sprocket 2BK45 1-1/8" Cast Iron SheaveSprocket #40 Chain 20 Tooth, 7 8 Finished Bore with Keyway & Set Screws Looking for a reliable #40 chain sprocket? This 20 tooth, 7 8 finished bore sprocket is built for dependable power transmission and comes ready to install with a precision keyway and two set screws for secure mounting. Its a durable choice for conveyors, industrial machinery, agricultural equipment, and general power transmission systems. Product Specifications Bore Size: 7 8