BlackStar 50SF84 - 50 Pitch QD Sprocket - 84 Tooth 35mm The 6/D315 has a 1-1/4"

The 6/D315 has a 1-1/4" width

"price":"2461

365K10 ships from our Houston

"mpn":"TB072053753530"

so a 2/BK122 from any major manufacturer shares the same dimensions and runs on the same pulleys/sheaves

BlackStar 50SF84 - 50 Pitch QD Sprocket - 84 Tooth 35mm The 6/D315 has a 1-1/4"The BlackStar 50SF84 is a 50 pitch QD roller chain sprocket with 84 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket requires a QD Type SF Bushing (sold separately). Specifications Part Number 50SF84 Chain Pitch 50 Number of Teeth 84 Maximum Bore 2 15 16" Bore Type QD Hub Style QD Bushing Required QD Type SF Bushing Strand Count Single Material Steel Outside