This Martin roller chain sprocket has a 1/2-inch pitch, fits size 40 chains, and is single strand with one set of teeth around its circumference for use with single strand chains. It is a Type B sprocket with a hub projection encircling the bore on one side, and both the hub and bore have fittings and tapering grooves to accommodate a split taper bushing that fits the diameter of the shaft. The teeth of the sprocket have been hardened by electrical induction or flame, further increasing their durability against wear. It meets International Organization for Standardization (ISO) 9001 for quality assurance. This single strand roller chain sprocket is suitable for use in a broad range of applications involving light to moderate loads and ongoing, high-cycle operations, including vehicle transmission systems, construction and agricultural equipment, conveyors, and factory manufacturing and assembly lines, among others.

A roller chain sprocket is a thin wheel with deep, uniformly spaced teeth ringing its circumference. The distance from the peak of one tooth to the next is called the pitch, and is commonly measured in 1/8-inch increments. The sprocket transfers power and motion by a roller chain that is threaded over the teeth of the sprocket. The alignment of the chain with the sprocket's pitch prevents the chain from slipping so that no power is lost. In the center of the sprocket is the bore (hole) for sliding the sprocket onto a shaft, and a bushing or bearing is often fitted to the sprocket’s hub to custom-fit the sprocket onto a shaft to hold it firmly in place. A hub is a protruding, raised lip encircling the bore of the sprocket. Sprockets with hubs on both sides are Type C, sprockets with hubs on one side are Type B, and sprockets with no hubs are Type A sprockets. For applications requiring sprockets to be swapped onto shafts of different diameters, a sprocket with a bore large enough to fit all shafts can be used, with the gap between the bore and shaft closed with a bushing or bearing. Roller chain sprockets are used in a broad range of applications where the drive power of an engine needs to be transferred into motion, such as in motor vehicles, conveyors, escalators, agricultural, forestry and mining equipment, aeronautics, robotics and space exploration, among others.

Martin Sprocket and Gear manufactures a variety of mechanical power transmission products such as sprockets, gears, bearings, and pulleys that meet International Organization for Standardization (ISO) standards for design and production. The company, founded in 1951, is headquartered in Arlington, TX.