K-55 BTC Casing 16 inch 72 lb/ft
K-55 grade seamless nonalloy steel casing with 406.4 mm (16 inch) OD, featuring BTC (Buttress Threaded and Coupled) connections for oil well intermediate casing strings. Used to stabilize wellbore during drilling. Matches 7304.29.50.60 for diameter, seamless iron/nonalloy steel in oil/gas tubing.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for smaller OD ranges like 177.8 mm
Narrower diameter tubing uses different statistical breakout under same heading.
If alloy steel grade like P-110
Higher alloy content (e.g., for sour service) shifts to alloy steel subheading 7304.59.
If imported as part of drilling rigs
Assembled into drilling equipment, classified under Chapter 84 parts of oil/gas machinery.
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
• Certify thread type (BTC) and connection integrity via torque-turn test data for customs verification
• Use NAIC codes specific to oilfield equipment for accurate statistical reporting
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