6-5/8 inch H-40 Casing with BTC Threads
Seamless H-40 grade nonalloy steel casing, 168.3 mm OD, 16.0 mm wall, buttress threaded and coupled (BTC) for oil drilling. Under HTS 7304.29.10.20 for seamless nonalloy casing used in oil/gas drilling, small OD, heavy wall design. Suited for surface casing protection.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If having wall thickness less than 12.7 mm
Wall thickness threshold determines heavy vs standard wall casing subheadings.
If parts of oilfield drilling rigs
Integral rig components classify under Chapter 84 machinery parts rather than raw pipes.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Provide BTC thread gauge reports and yield strength certs
• Use 'casing' not 'pipe' in descriptions
• Pitfall: diameter rounding errors shifting OD classification
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