A gear is designed to transfer power from one section of a machine to another section of the machine. When a gear system is first designed, diametral pitch is important because it helps determine what size and type of gear is needed to interlock with any other gear. It is the ratio of the reference diameter of the gear divided by the number of teeth. Module: is the unit of size that indicates how big or small a gear is.
The following charts convert gear pitch dimensional data to the following: Diametral Pitch, Module, Circular Pitch. Coarse Thread Series (UNC/UNRC) is the most common designation for general application bolts and nuts.
Thread Pitch Chart Thread series cover designations of diameter/pitch combinations that are measured by the number of threads per inch (TPI) applied to a single diameter.
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