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Metric GearsMetric gears are defined by the module system, as follows:
ModuleThe length in mm of the pitch circle diameter per tooth.MOD = PCD / N
Number of TeethThe number of teeth on the gear.N = PCD / MOD
Pitch Circle DiameterThe diameter of the pitch circle.PCD = N x MOD
Outside DiameterThe outside diameter of the gear.OD = (N + 2) x MOD
Center DistanceThe distance between the axes of two gears in mesh.
C = PCD(g) + PCD(p)
Circular PitchThe distance between adjacent teeth measured along the arc at the pitch circle diameter.
CP =
Circular Tooth ThicknessThe width of a tooth measured along the arc at the pitch circle diameter.CTT = CP / 2
AddendumThe height of the tooth above the pitch circle diameter.A = MOD
DedendumThe depth of the tooth below the pitch circle diameter.D = H - A
Whole DepthThe total depth of the space between adjacent teeth.
Finer than 1.25 MOD:
1.25 MOD and coarser:
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x MOD