Martin Roller Chain Sprocket, Reboreable, Type B Hub, Triple Strand, 08B Chain Size, 12.7mm Pitch, 17 Teeth, 16mm Bore Dia., 75.46mm OD, 54mm Hub Dia., 35.05mm Width

The Martin metric triple, also known as a triplex, type B sprocket is suitable for use with the series ISO 08B-3/metric 40-3 chain with 12.70 mm (0.500”) 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 triple style accepts three chains side-by-side. The chain data for this class of sprockets is BS 228/7, ISO 08B-3; pitch is 12.70 mm (0.500”); roller diameter is 8.51 mm (0.335”); roller width is 7.75 mm (0.305”); and tensile strength is 4,540 kg (10,000 lb.). The options for this class of sprocket are: number of teeth from 11 to 114; pitch diameter from 45.08 to 460.91 mm; stock bore size from 14 to 30 mm; maximum bore size from 22 to 85 mm; hub diameter from 30 to 130 mm; length through bore from 50 to 65 mm; and approximate weight from 0.32 to 41.90 kg. The face width (not including the hub) is 35.05 mm (1.380”). The chain row thickness is 7.24 mm (0.284”) 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 08B-3 chain, 12.70 mm pitch, meets ISO metric standards
• Triple type B sprocket offers a stable and secure attachment to the shaft and flexibility in mounting arrangements for applications that require three chains
• Shaft diameter size from 14 to 30 mm for a variety of applications
• Varying numbers of teeth and pitch diameter sizes offer application flexibility
• High carbon steel for strength and durability