7-inch P110 Casing with BTC Coupling
Seamless P110 grade alloy steel casing pipe, 7-inch OD with Buttress Threaded and Coupled (BTC) connections for high-pressure oil well applications. Wall thickness under 12.7 mm suitable for intermediate casing strings in directional drilling. Meets 7304.29.31.10 criteria as threaded/coupled seamless alloy steel casing under 215.9 mm OD.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If outside diameter 215.9 mm or greater
Larger diameter casing for bigger wells classified in .31.50 statistical breakout.
If stainless steel composition
Stainless steel casing falls under 7304.19 rather than other alloy steel 7304.29.
If imported as part of complete drill string assembly
Assembled drill pipe/casing sets may classify under oilfield machinery parts in Chapter 84.
Not sure which classification is right?
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Import Tips & Compliance
• Provide detailed dimensional certificates confirming OD <215.9 mm and wall thickness <12.7 mm
• Include thread inspection reports for BTC couplings to verify manufacturing standards
• Declare exact API grade (P110) and intended well depth to support classification
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