BlackStar 50BS45 1 K2S - 50 Pitch Finished Bore Sprocket - 45 Tooth - 1" Bore Medium-Duty Pillow Block 340J8 has 8 ribs and

340J8 has 8 ribs and a 34 in (Pitch Length)

so the Megadyne CX240 interchanges with Gates

270H150US is a standardized industry size

Prefer our D&D Global equivalent: XPZ2650 Cogged V-Belt

BlackStar 50BS45 1 K2S - 50 Pitch Finished Bore Sprocket - 45 Tooth - 1" Bore Medium-Duty Pillow Block 340J8 has 8 ribs andThe BlackStar 50BS45 1 K2S is a 50 pitch Finished Bore roller chain sprocket with 45 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 50BS45 1 K2S Chain Pitch 50 Number of Teeth 45 Bore Size 1" Minimum Bore 3 4" Maximum Bore 1 15 16" Bore Type Finished