钢制管螺纹。螺纹量规。过端和不过端螺纹塞规。

Steel conduit thread; thread gauges, "go" and "not go" thread plug gauges.

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特殊螺纹接头油井管的开发是一项系统工程，其中量规、量具设计是开发中的一个重要环节。

The development of the oil well pipe with special thread connection is a systematical project involving development of relevant gauges and measuring tools for the thread as a key item.

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