unilateral system of tolerances

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unilateral system — noun : a system of tolerances and allowances as applied to cylindrical mating surfaces having for its basis unilateral holes and involving measurement of the high and low limits of tolerance in one direction from the basic size … Useful english dictionary
Geometric dimensioning and tolerancing — (GD T) is a system for defining and communicating engineering tolerances. It uses a symbolic language on engineering drawings and computer generated three dimensional solid models for explicitly describing nominal geometry and its allowable… … Wikipedia

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