English: Typical tooth dimensions of a spur gear. This illustration has involute tooth profiles, with the gear having 20 teeth in total. Four distinct dimensions are labeled:
t = tooth width, measured along the pitch circle
p = circular pitch, measured along the pitch circle
a = addendum, measured radially between the pitch circle and the addendum circle
b = dedendum, measured radially between the pitch circle and the dedendum circle
The gear also has three circles, which are not labeled. These are:
Dedendum circle = through the base of the teeth
Pitch circle = meshed gears have their pitch circles in tangent contact
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