16 Inch Intermediate Casing Threaded Steel
16-inch N80 intermediate casing with LTC (Long Threaded and Coupled) connections for oil well protection against collapse. Welded non-alloy steel API 5CT pipe. Classified under 7306.29.10.90 as other threaded casing for drilling.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If stainless steel for corrosive formations
Corrosion-resistant stainless intermediate casing under 7306.19.
If galvanized or coated versions
Galvanized steel tubes shift to Chapter 73 articles of iron/steel.
If with plastic/resin internal coating
Internally coated drill pipe/casing uses dedicated subheading.
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Import Tips & Compliance
• Intermediate casing requires zonal isolation documentation for end-use verification
• LTC vs STC threads affect torque ratings—specify in import docs
• Rust preventive coating must be declared to avoid chemical treatment classification
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