4-1/2 Inch N-80 Casing with BTC Threads
Seamless N-80 nonalloy steel casing pipe, 4-1/2 inch OD, 9.5 mm wall thickness, featuring buttress thread couplings (BTC) for oil well applications. Classified under HTS 7304.29.10.10 as threaded/coupled seamless casing of iron/nonalloy steel with OD <215.9 mm and wall <12.7 mm for drilling.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If having outside diameter of 215.9 mm or more
Larger diameter casings, even with similar specs, fall under the 7304.29.30 subheading.
If imported as part of completed drilling machinery
If assembled into turbo-drill components, it may classify under Chapter 84 as machinery parts.
If welded instead of seamless
Welded construction shifts to heading 7306 for other welded steel tubes.
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
• Ensure threading type (e.g
• BTC, LTC) is documented; mismatches can lead to reclassification
• Provide pressure test reports and chemical composition analysis for customs verification
• Label packages clearly with HTS code, dimensions, and 'OIL WELL CASING' to prevent inspection delays
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