Martin 40B12 Stock Bore Type B Single Pitch Roller Chain Sprocket, 1/2 in Dia Bore, 2.166 in OD, #40 Chain, 12 Teeth, 1/2 in Pitch, Steel
B style sprockets are flat sprockets with a hub extension on one side. These plain bore sprockets can easily be bored to a metric or standard size to fit your application. Keyways, set screws and hardened teeth are quick alterations that can be made.
Martin Single Pitch Roller Chain Sprocket, Stock Bore Type B, 1/2 in Bore Dia, 2.166 in Outside Dia, #40 Chain, 12 Teeth, 1/2 in Pitch, 1.932 in, 1.593 in Hub Dia, 7/8 in Length Through Bore, Steel
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