FIELD: oil and gas industry.
SUBSTANCE: method includes adjustment of working screw gauges of rings and working plug gauges accordingly to reference screw plug gauges and to reference screw ring gauges, at the same time the distance between the measurement plates of a reference gauge and a working gauge must be equal to l4, which is calculated according to the following formula: 
where l3 - distance from the measurement plane to the small end of the screw plug gauge, mm, D - inner diametre of thread of a screw ring gauge in a plane of a small end, mm, d5 - inner diametre of thread in the main plane of the screw plug gauge, mm.
EFFECT: extended service life of working gauges.
2 cl, 4 dwg
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