BlackStar D50SK48 - Double Strand 50 Pitch QD Sprocket - 48 ToothThe BlackStar D50SK48 is a 50 pitch double strand QD roller chain sprocket with 48 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a QD Type SK Bushing (sold separately). Specifications Part Number D50SK48 Chain Pitch 50 Number of Teeth 48 Maximum Bore 2 5 8" Bore Type QD Hub Style QD Bushing Required QD Type SK Bushing Strand Count Double Material