BlackStar 120BS11 1 1/2 K2S - 120 Pitch Finished Bore Sprocket - 11 Tooth - 1-1/2" Bore TL1310 com/products/pix-9-spa1782-industrial-v-belt"

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20/A61 is a standardized industry size

"name":"D&D Global 1130K15 Micro-V Serpentine Belt — K Section

The 9/D345 is rated for continuous operation from -22°F to 176°F

BlackStar 120BS11 1 1/2 K2S - 120 Pitch Finished Bore Sprocket - 11 Tooth - 1-1/2" Bore TL1310 com/products/pix-9-spa1782-industrial-v-belt"The BlackStar 120BS11 1 1 2 K2S is a 120 pitch Finished Bore roller chain sprocket with 11 teeth, precision manufactured from SAE 1045 steel and features machine cut tooth profiles for smooth, reliable chain engagement. This sprocket has a 1 1 2" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 120BS11 1 1 2 K2S Chain Pitch 120 Number of Teeth 11 Bore Size 1 1 2" Minimum Bore 1 3 8" Maximum Bore 2 3