1 19/32". 31/32". 1 1/4". 0.284. 20.28. #40 BTB Sprockets. #40 BTB sprockets are designed for #40 roller chains with a 1/2-inch pitch. Featuring a BTB hub (Bushings Taper Bushed), they utilize a tapered bore that accepts a tapered bushing. The bushing is tightened onto the shaft, establishing a secure connection between the sprocket and the shaft.
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