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API casing thread gauging

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ngauge

ngauge

Materials
Joined
Oct 23, 2002
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7
Location
CA
Please advise what specification is used to manufacture the thread gauges go and nogo for the following:

6" api 6a back pressure valve threads HBPV
Atlas Bradford gauges and the like.

thanks much....
 
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These are proprietary threads so the correct answer is:
The standard for the H BPV gauge is owned by Cooper Cameron and the standard for the Atlas Bradford gauge is owned by Grant Prideco.
 
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