通常被错误地称为国家标准尺寸，以免与国家标准螺纹尺寸相混淆。
It is often incorrectly called National pipe Size, due to confusion with National pipe thread.
普通螺纹量规（螺纹环规、螺纹塞规）适用于检测符合国家标准及国际标准的螺纹制件。
The common thread gauges including ring gauges and plug gauges are used to calibrate thread work pieces with GB and ISO standards.
普通螺纹量规（螺纹环规、螺纹塞规）适用于检测符合国家标准及国际标准的螺纹制件。
The common thread gauges including ring gauges and plug gauges are used to calibrate thread work pieces with GB and ISO standards.
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