Martin Roller Chain Sprocket, Hardened Teeth, Taper Bushed, Type A Hub, Double Single Strand, 40 Chain Size, For 1215 Bushing, 0.5" Pitch, 19 Teeth, 1.25" Max Bore Dia., 3.3" OD, 2.5" Hub Dia., 1.40625" Width

The Martin double single-taper bushed sprocket accepts two number 40 (also called 40-1) chains, on a type A hub with 1/2" pitch, a minimum bore diameter of 1/2", 18 to 24 teeth, and is made from high carbon steel , for high strength and durability. This style of bushing has a secure fit and interchangeability for flexibility in application deployment. The bore can be enlarged for different shaft diameter options. With type A sprockets, there is no hub extension, which presents a narrow profile than one with hub extensions. This model is to be mounted on a single-tapered bushing. Such bushings allow the same sprocket to be used with different shaft diameters. This series of sprockets uses Martin bushing size 1215 in the 18-20 teeth option, and bushing size 1615 for the 21-24 tooth option. The face widths of the different sprocket options are 1 1/2 inch. The outside diameter ranges from 3.140 (18 teeth) to 4.100 inches (24 teeth). The pitch diameter, which is the diameter of the pitch circle, increases from 2.879 for the 18-tooth option up to 3.831 inches with the 24-tooth sprocket. All Martin sprockets adhere to 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 interact 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 sprockets and a chain to deliver power from the rider’s legs to the wheels making the bike move. Martin Sprocket and Gear started in 1951 and expanded into machining, fabrication, forging, casting, powdered metal technology, and plastic injection molding of countless power transmission and conveying products for the global market.

• Double single sprocket accepts two number 40 chains on a single hub for multiple drive applications
• Number of teeth range from 18 to 24 for flexibility in application deployment
• Type A hub accepts single-tapered bushings for secure fit and interchangeability
• From a minimum bore diameter of one-half inch, the bore can be enlarged, which offers flexibility for different applications
• Manufactured from high carbon steel for high strength and durability