Tolerance Unit
Tolerance Unit : A unit of relative distance used by engineers when they put round pegs in round holes. Whenever a shaft passes through a hole, a small distance (the tolerance) must be left so that the shaft will be able to turn. If the diameter of a shaft is D millimeters, one tolerance unit for that shaft is 0.001D + 0.45(cube root of D). The cube root term allows proportionately more tolerance for smaller shafts. The actual tolerance can then be stated as a multiple of the tolerance unit
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