L099U Insert | L099U Coupling Insert - L099U Spider (Urethane) D40B48 Sprockets This BK52 Pulley 3/4" bore

This BK52 Pulley 3/4" bore is directly interchangeable with other manufacturers

Dimension (B): 33mm

Part #: PF211

While the phosphate coated and then painted finish adds corrosion resistance to the 8C300J sheave

50BS70 1 7/16" Finished Bore Sprocket Dimensions

L099U Insert | L099U Coupling Insert - L099U Spider (Urethane) D40B48 Sprockets This BK52 Pulley 3/4" boreL099U 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