Product features
For use with 80-2 chain, 1″ pitch for driver or driven sprocket applications
Double type B sprocket offers a stable and protected attachment to the shaft, and can be modified to suit a multitude of applications requiring two chains
Shaft diameter choices range from 1 to 1-1/2″ for a number of applications
Varying amounts of teeth and pitch diameter sizes offer application flexibility
High carbon steel for durability and strength
Product description
The Martin dual, also known as a duplex, type B sprocket is ideal for use with the series 80-2 chain with 1” pitch for driver or driven sprocket applications. Varying numbers of the teeth and pitch diameters provide application flexibility. Made from high carbon metal, it has high strength and durability. Multiple chain capability allows for more power at higher operational speeds with higher load capacity.
Type B sprockets have a hub extension using one side to provide stability, and invite for the use of full-depth keyways and standard setscrews to add the sprocket. They are able to also accommodate an array of shafts. The double design 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”; share 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”; duration through bore from 2-3/4 to 4-1/4”; and approximate weight from 3.6 to 165 lb. The facial skin width (excluding the hub) is 1.710”. The chain row thickness is usually 0.557” nominal. Hubs with a diameter size of 2-9/16” possess a recessed groove for chain clearance. Optimum bores will accommodate regular keyseat and setscrew over keyseat. Slightly bigger bores are possible with no keyseat, shallow keyseat, or setscrew at angle to keyseat. All Martin sprockets fulfill or exceed ANSI requirements.
A sprocket is a wheel with tooth around the perimeter that meshes with a chain, track, or various other perforated or indented material. Unlike gears that mesh with 
another gear, sprockets mesh with a chain, which in turn interacts with another sprocket. Gears can be used to transmit power around a corner, based on how they fit with each other. Sprockets with chains only work in straight lines. Some common advantages of chain-drive systems include minimal slippage, a set ratio between rotating shafts, and versatility with many different chain attachments and sprocket materials selections. An example of a power transmission system is a typical bicycle, which has 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 tranny and conveying items. The business was founded in 1951 and is definitely headquartered in Arlington, TX. Martin provides equipment that meet American Nationwide Standards Institute (ANSI), National Aerospace Regular (NAS), and Deutsches Institut für Normung (DIN) standards.