GB/T 4749-2003
Gauge for threads of tool joints for petroleum drilling
石油钻具接头螺纹量规
📚 References & Relations / 引用与关联
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GB/T 230-1991
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GB/T 4749--2003
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GB/T 6060.2-1985
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GB/T 6062-2002
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GB/T 9253.
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GB/T 9253.1-1999
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ISO 3274
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NC10
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NC10-
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NC12
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NC13
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NC16
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NC23
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NC26
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NC31
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NC35