BlackStar 41BS42 1 K2S - 41 Pitch Finished Bore Sprocket - 42 Tooth - 1" Bore 1.3/16" The 1185H100 is a timing

The 1185H100 is a timing belt from D&D Global's Dura-Premium Torque - H Series line

16AT5/1125US is a standardized industry size

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What does the T5US in 25T5/1380US mean

BlackStar 41BS42 1 K2S - 41 Pitch Finished Bore Sprocket - 42 Tooth - 1" Bore 1.3/16" The 1185H100 is a timingThe BlackStar 41BS42 1 K2S is a 41 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" bore with keyway and set screws and is ready for immediate installation. Specifications Part Number 41BS42 1 K2S Chain Pitch 41 Number of Teeth 42 Bore Size 1" Minimum Bore 3 4" Maximum Bore 2 3 8" Bore Type Finished