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       Standards & Tolerances


Standards and tolerances have been established to ensure our customers get consistently accurate, dependable parts.

Backlash - Our gears are cut to operate on standard center distances with backlash. The backlash for mating gears, when assembled, is shown in the table below.

Concentricity - The concentricity of the pitch line with bore (TIR - total indicator reading) is held to the tolerances specified in the table below. Other dimensions are held to standard commercial tolerances and finishes.

Bores - Our gears are bored, honed or ground to a smooth finish and held to tolerances as follows:

1/4" diameter bore to 1" diameter bore +-.0005"
1-1/16" diameter bore to 2" diameter bore +-.00075
Please call for bores larger than 2" -- 800-523-2576

Diametral Pitch Circular Pitch Metric Pitch (module) Backlash Concentricity
2 DP 1-1/2" CP 12 MOD .010-.015" .008
2.5 DP 1-1/4" CP 10 MOD .010-.015" .008
3 DP 1" CP 8 MOD .009-.014" .006
4 DP 3/4" CP 6 MOD .007-.011" .006
5 DP 5/8" CP 5 MOD .006-.009" .005
6 DP 1/2" CP 4 MOD .005-.008" .005
8 DP 3/8" CP 3 MOD .004-.006" .005
10 DP 5/16" CP 2.5 MOD .003-.005" .004
12 DP 1/4" CP 2 MOD .003-.005" .004
16 DP 3/16" CP 1.5 MOD .002-.004" .0025
20 DP 1.25 MOD .002-.004" .0025
24 DP 1/8" CP 1 MOD .002-.004" .0025
32 DP 1/10" CP .75 MOD .002-.003" .002
48 DP 1/16" CP .5 MOD .002-.003" .002
64 DP 1/20" CP .4 MOD .002-.003" .002
*Parts conform to tolerances spelled out on customer's drawings when supplied.