BlackStar 80BS42 1 7/16 K2S - 80 Pitch Finished Bore Sprocket - 42 Tooth - 1-7/16" Bore TL1108 3/B68 has a top width

3/B68 has a top width of 2

2/A86 is a standardized industry size

The Gates 920-8MGT-50 PowerGrip GT4 Belts - 8M and 14M is a synchronous timing belt with 8MGT-pitch profile

P14M profile

BlackStar 80BS42 1 7/16 K2S - 80 Pitch Finished Bore Sprocket - 42 Tooth - 1-7/16" Bore TL1108 3/B68 has a top widthThe BlackStar 80BS42 1 7 16 K2S is a 80 pitch Finished Bore roller chain sprocket with 42 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 7 16" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 80BS42 1 7 16 K2S Chain Pitch 80 Number of Teeth 42 Bore Size 1 7 16" Minimum Bore 1 3 8" Maximum Bore 2 15