Martin Roller Chain Sprocket, Hardened Teeth, Idler, Type C Hub, Single Strand, 50 Chain Size, 0.625" Pitch, 15 Teeth, 0.625" Bore Dia., 3.32" OD, 0.343" Width

The Martin ball bearing idler sprocket is suitable for use with the series 50 chain, 5/8” pitch. Varying numbers of teeth and stock bore sizes offer application flexibility. Made from high carbon steel, it has high strength and durability.

The options for this class of sprocket are: 15, 17, 25, or 39 teeth; outer diameter encompassing the entire idler sprocket from 3.32” to 8.12”; stock bore size of 0.510”, 0.638”, or 0.750”; length through bore size of 0.61” or 0.72”; tooth width of 0.343”; and a weight of 0.75 pounds to 4.09 pounds. The tolerance on the stock bore size 0.510” is + or - 0.005” to 0.000”, for the stock bore size 0.638” it is + or - 0.005” to 0.000”, and for the stock bore size 0.750” it is + or - 0.005”to 0.000”. All Martin sprockets adhere to ANSI standards.

As chains wear, they elongate, which can cause issues that affect performance and wear characteristics. Idler sprockets can be used to take up slack caused by elongation, to change the direction of rotation of a driven shaft, to guide chain around an obstruction, or to help provide more wrap (more teeth engaged with the chain) on another sprocket. Ball bearings decrease friction and have good axial and lateral bearing load protections.

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, founded in 1951, manufactures power transmission and conveying products using machining, fabrication, forging, casting, plastic injection molding, and powered metal technology. It has facilities throughout the U.S., as well as in Canada, Mexico, China, and Brazil.