螺纹标记
螺纹标记-
谈管螺纹的选用与标记
Reference to the Application and Symbol of Pipe Threads
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API偏梯形螺纹套管三角形上螺纹标记疑点分析
The differences of understanding and practical operation of triangle stamp marking on API deflected trapezoidal thread casing
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API偏梯形螺纹套管内外螺纹机紧联接时，采用控制接箍端面与管体上三角形上螺纹标记之间相对位置的方式进行上螺纹。
When power-tight API trapezoidal threaded casing , the adoption of using triangle marking on casing as relative position to tight casing is a long practice in oilfield .