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Martin Roller Chain Sprocket - Bore Diameter: 0.625" (40B21SS)

  • Added more than 30 days ago


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  • Stainless steel, to resist corrosion and scaling
  • For use with series 40 chain, 1/2" pitch for driver or driven sprocket applications
  • Type B sprocket offers a stable and secure attachment to the shaft
  • Shaft diameter of 1/2" to 3/4" for a variety of applications
  • Varying of numbers of teeth and outside diameter options for flexibility in usage

The Martin stainless steel, type B sprocket is suitable for use with the series 40 chain with 1/2 pitch. Varying numbers of teeth and outside diameter options offer application flexibility. Made from stainless steel, it has excellent resistance to various types of corrosion, including rust and scaling; and it retains strength at high temperatures.

Type B sprockets have a hub extension on one side to provide stability, and allow for the use of a keyway and setscrew to attach the sprocket onto a shaft.

The options for this class of sprocket are: number of teeth from 10 to 60; outside diameter from 1.840 to 9.840 ; stock bore size of 1/2 to 3/4 ; maximum bore size from 3/4 to 2-3/8 ; hub diameter from 1-1/4 to 3-1/2 ; length through bore from 7/8 to 1.00 ; and a weight from 0.28 lbs to 7.00 lbs. The tooth width is 0.168 nominal. Hubs with a diameter of 1-9/16 or smaller have a recessed groove for chain clearance. The maximum bore size will accommodate the standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at angle to keyseat. All Martin sprockets meet or exceed ANSI standards.

A sprocket is a wheel with teeth around the perimeter that meshes with a chain, track, or other perforated or indented material. Unlike gears that mesh with another gear, sprockets mesh with a chain, which then interacts with another sprocket. Gears can be used to transmit power around a corner, based on how they fit together. Sprockets with chains only work in straight lines. Some common benefits of chain-drive systems include minimal slippage, a fixed ratio between rotating shafts, and versatility with many different chain attachments and sprocket material selections. An example of a power transmission system is a standard bicycle, which has a sprocket and a chain to deliver power from the rider s legs to the wheels making the bike move.

Martin Sprocket & Gear manufactures power transmission and conveying products. The company was founded in 1951 and is headquartered in Arlington, TX. Martin provides tools that meet American National Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutsches Institut f r Normung (DIN) standards.

  • UPC 697950065434
  • Material Type Stainless Steel
  • System of Measurement Inch
  • Bore Diameter 0.625 inches
  • Hub Diameter 3.5 inches
  • Outside Diameter 3.618 inches
  • Pitch 0.5 inches
  • Overall Width 0.284 inches
  • Number of Teeth 21
  • Bore Diameter Tolerance +.001 - .000 inches
  • EAN 0697950065434
  • Outside Diameter 3.618 inches
  • Outside Diameter Tolerance +/- .010 inches
  • Overall Length 1 inches

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