• For use with series 40 chain, 1/2" pitch for driver or driven sprocket applications
  • Type BS sprocket with hardened teeth, two setscrews, and a keyway offers a stable and secure attachment to the shaft
  • Shaft diameter size from 1/2 to 1-1/2" for a variety of applications
  • Varying numbers of teeth, hub sizes, and stock bore sizes offer application flexibility
  • High carbon steel for strength and durability
The Martin type BS sprocket, also known as a bored-to-size sprocket, with hardened teeth, includes two setscrews and a keyway, and is suitable for use with the series 40 chain with 1/2? pitch. This sprocket has been adapted for installation on the shaft without additional components. Made from high carbon steel, it has high strength and durability. Type BS sprockets have a hub extension on one side to provide stability and allow for the use of a full-depth keyway and two standard setscrews to attach the sprocket onto a shaft. The options for this class of sprocket are: number of teeth from 9 to 30; outside diameter from 1.670 to 5.060?; length through bore from 7/8 to 1.00?; and approximate weight from 0.16 to 2.70 lb. The chain row width is 0.284? nominal. The keyway is on the centerline of the tooth. The following exceptions are present: the 9- through 15-tooth option with 1/2? shaft have no keyway and use two (2) 1/4? setscrews at 90 degrees to each other. With this series of sprock
  • Bore Diameter: 1.188 inches
  • Hub Diameter: 3 inches
  • Outside Diameter: 3.938 inches
  • Pitch: 0.5 inches
  • Outside Diameter Tolerance: +/- .010 inches
  • Overall Length: 1 inches
  • Hub Style: Type B
  • Size: 40
Roller Chain Sprocket
Roller Chain Sprocket

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