415 B 16 Tooth Sprocket 3/4" ID with a 3/16" keyway, two set screws.
We took a # 41 sprocket and milled down the teeth to make a 415 that will use 1/2" x 3/16" chain. Plain machined Finish or Black Oxide finish.
Best to use 415 chain (1/2" pitch x 3/16" width) These sprockets can also be used with #41 Chain (1/2" x 1/4") and even #40 Chain (1/2" x 5/16")
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