Product features
For use with 80-2 chain, 1″ pitch for driver or driven sprocket 
applications
Double type B sprocket provides a stable and secure attachment to the shaft, and will be modified to match a wide variety of applications requiring two chains
Shaft diameter choices range from 1 to 1-1/2″ for a variety of applications
Varying amounts of teeth and pitch diameter sizes offer application flexibility
High carbon steel for strength and durability
Product description
The Martin double, also referred to as a duplex, type B sprocket is suitable for use with the series 80-2 chain with 1” pitch for driver or driven sprocket applications. Varying amounts of tooth and pitch diameters offer application flexibility. Made from high carbon metal, it has high strength and durability. Multiple chain capability permits more power at higher operational speeds with greater load capacity.
Type B sprockets possess a hub extension using one side to provide stability, and invite for the usage of full-depth keyways and standard setscrews to attach the sprocket. They can also accommodate an array of shafts. The double style accepts two chains side-by-side.
The options for this class of sprocket are: number of teeth from 10 to 95; outside diameter from 3.680 to 30.830”; stock bore size from 1 to 1-1/2”; maximum bore size from 1-1/2 to 4”; hub diameter from 2-9/16 to 6”; size through bore from 2-3/4 to 4-1/4”; and approximate weight from 3.6 to 165 lb. The facial skin width (not including the hub) is 1.710”. The chain row thickness is usually 0.557” nominal. Hubs with a diameter size of 2-9/16” have a recessed groove for chain clearance. Optimum bores will accommodate standard keyseat and setscrew over keyseat. Slightly bigger bores are possible without keyseat, shallow keyseat, or setscrew at position to keyseat. All Martin sprockets meet or exceed ANSI requirements.
A sprocket is a wheel with the teeth around the perimeter that meshes with a chain, track, or various other perforated or indented materials. 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 jointly. Sprockets with chains only work in straight lines. Some common advantages 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, that includes a sprocket and a chain to deliver power from the rider’s legs to the tires producing 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 Nationwide Standards Institute (ANSI), National Aerospace Standard (NAS), and Deutsches Institut für Normung (DIN) standards.