GB1800～1804－79《公差与配合）、GB1957－81《光滑极限量规》和GB3177—82《光滑工件尺寸的检验》是我国加入国际标准化组织（ISO）后，首批采用ISO标准的重要基础互换性标准。从此我国的公差与配合制从执行1959年制定的FOCT公差制转为采用国际公差制。近20年来公差与配合系 GB1800-1804-79 “Tolerance and cooperation”, GB1957-81 “smooth limit gauge” and GB3177-82 “smooth workpiece size test” is China’s accession to the International Organization for Standardization (ISO), the first batch of ISO standards using an important basis for mutual Standard for change. From our country’s tolerance and cooperation system from the implementation of the 1959 FOCT tolerance system developed to adopt international tolerance system. Tolerance and cooperation in the past 20 years