4.5-inch N-80 Casing Pipe
Seamless N-80 nonalloy steel casing pipe, 4.5-inch (114.3 mm) OD, 13.5 mm wall thickness, with premium threaded connections and couplings for deep oil/gas wells. HTS 7304.29.10.20 applies due to seamless construction, nonalloy material, drilling casing purpose, sub-215.9 mm diameter, and thick walls for structural integrity. Used primarily in production casing applications.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If outside diameter 285.8 mm or more
Larger OD casings move to separate statistical breakout for heavy wall large-diameter pipes.
If for other drilling uses beyond oil/gas
Non-oil/gas drilling tubes (e.g., water wells) classify under different hollow profile heading.
If alloy steel construction
Presence of alloying elements exceeds nonalloy threshold, shifting to alloy steel casing category.
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
• Submit API 5CT grade verification and hydrostatic test results
• Clearly mark as 'oil/gas casing' vs. tubing on manifests
• Pitfall: confusing with drill pipe, which has separate tubing subheading
Related Products under HTS 7304.29.10.20
API 5CT L-80 Type 9 Casing Pipe
Seamless L-80 Type 9 casing pipe made from nonalloy steel, threaded and coupled, with an outside diameter of 177.8 mm and wall thickness of 14.2 mm, designed for oil and gas well drilling. It falls under HTS 7304.29.10.20 due to its seamless construction, nonalloy steel material, specific diameter less than 215.9 mm, and thick wall exceeding 12.7 mm for high-pressure environments. This classification ensures accurate duty assessment for drilling casings.
7-inch J-55 Threaded Casing Tube
Seamless J-55 grade casing with 7-inch (177.8 mm) OD, 15.9 mm wall thickness, threaded ends and couplings, constructed from nonalloy steel for oil well casing strings. Classified under HTS 7304.29.10.20 for its seamless iron/nonalloy steel build, drilling-specific use, OD under 215.9 mm, and robust wall thickness ≥12.7 mm. Ideal for intermediate casing in drilling operations.
5-1/2 inch K-55 Heavy Wall Casing
Threaded and coupled K-55 seamless casing, 139.7 mm OD, 14.0 mm wall thickness, nonalloy steel for corrosive oilfield environments. Fits HTS 7304.29.10.20 precisely as seamless drilling casing of iron/nonalloy steel, OD <215.9 mm, wall ≥12.7 mm. Provides collapse resistance in conductor casing strings.
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.
3-1/2 inch P-110 High Pressure Casing
Premium P-110 seamless casing pipe, 88.9 mm OD, 13.7 mm wall thickness, threaded/coupled nonalloy steel for high-pressure gas wells. HTS 7304.29.10.20 classification reflects seamless drilling casing specs: nonalloy, OD<215.9 mm, wall≥12.7 mm. Delivers superior tensile strength.