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120A10 sprockets with a stock bore comes with a 1-1/4" inside diameter plain hole and can be easily machine bored to custom sizes
50BS70 1 7/16" Finished Bore Sprocket Dimensions
35BS13 5/8" Finished Bore Sprocket Dimensions
This BK52 Pulley 3/4" bore is directly interchangeable with other manufacturers
and bushings
L099U Insert | L099U Coupling Insert - L099U Spider (Urethane) D40B48 Sprockets 120A10 sprockets with a stockL099U insert is a Urethane jaw coupling insert with good flexibility and medium soft torsional stiffness. L099U inserts are also called L099U spiders and are used within L099 coupling hubs. The insert is the critical component allowing flexibility and is placed between the jaw hubs, preventing metal on metal contact. More specifically, the L099U coupling insert is made from high quality Urethane, which is a polyurethane material that is orange in
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