Martin D24B20 Metric Double Type B Sprocket for 24b-2 Chain, 38.10 mm Pitch, 20 Teeth, 40 mm Bore Diameter, 263.41 mm Outside Diameter, 71.98 mm Wide
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The Martin metric double, also known as a duplex, type B sprocket is suitable for use with the series ISO 24B-2/metric 120-2 chain with 38.10 mm (1.50”) pitch for driver or driven sprocket applications. Varying numbers of teeth and pitch diameters offer application flexibility. Made from high carbon steel, it has high strength and durability. Multiple chain capability allows for more power at higher operational speeds with greater load capacity.
Type B sprockets have a hub extension on one side to provide stability, and allow for the use of full-depth keyways and standard setscrews to attach the sprocket. They can also accommodate a wide range of shafts. The double style accepts two chains side-by-side.
The chain data for this class of sprockets is BS 228/18, ISO 24B-2; pitch is 38.10 mm (1.50”); roller diameter is 25.40 mm (1.00”); roller width is 25.40 mm (1.00”); and tensile strength is 19,960 kg (44,000 lb.).
The options for this class of sprocket are: number of teeth from 11 to 114; pitch diameter from 135.23 to 1,382.72 mm; stock bore size from 32 to 40 mm; maximum bore size from 60 to 161 mm; hub diameter from 90 to 238 mm; length through bore from 100 to 159 mm; and approximate weight from 6.50 to 393.13 kg. The face width (not including the hub) is 71.98 mm (2.834”). The chain row thickness is 23.62 mm (0.930”) nominal. Maximum bores will accommodate 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 für Normung (DIN) standards.
- For use with 24B-2 chain, 38.10 mm pitch, meets ISO metric standards
- Double type B sprocket offers a stable and secure attachment to the shaft, and can be modified as needed to suit applications requiring two chains
- Shaft diameter options range from 32 to 40 mm for a variety of applications
- Varying numbers of teeth and pitch diameter sizes offer application flexibility
- High carbon steel for strength and durability
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