9-5/8 inch 36# K55 Oil Well Casing
Seamless K55 grade casing with 9-5/8 inch OD (244.5 mm), 36 lb/ft, wall thickness 10.54 mm, designed for intermediate casing strings in oil drilling. Provides structural support and pressure containment in well construction. Classified under 7304.29.20.30 for its size, seamless nature, and thin wall specification.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If outside diameter less than 215.9 mm
Smaller casing sizes like 7-inch fall under the preceding diameter subheading.
If made of alloy steel
Higher strength alloy grades (e.g., L80 Type 1) classify under alloy steel casing provisions.
If assembled into gas compressor tubing sets
When imported as completed gas gathering line assemblies, may classify as gas compressor parts.
Not sure which classification is right?
The Tariff Assistant works through the GRI rules on your specific product to reach the right HTS code — and can price the duty on it in the same conversation.
Import Tips & Compliance
• Provide thread type specification (e.g
• BTC, STC) and coupling details in commercial invoice to confirm casing classification
• Ensure marking includes API grade, size, and weight per API 5CT standards for customs verification
• Avoid bundling with premium connections that might trigger parts classification under 8431
Related Products under HTS 7304.29.20.30
API 9-5/8 inch 40# P110 Casing Pipe
Seamless steel casing pipe with 9-5/8 inch (244.5 mm) outside diameter, 40 lb/ft weight, and P110 grade, wall thickness of 11.0 mm. Used to line oil and gas wells during drilling operations to stabilize the borehole. Falls under HTS 7304.29.20.30 due to its seamless construction, nonalloy steel composition, and specified diameter range (215.9-285.8 mm) with wall thickness under 12.7 mm.
10-3/4 inch 40.5# J55 Gas Well Casing
Seamless J55 grade steel casing, 10-3/4 inch (273 mm) OD, 40.5 lb/ft weight, 11.5 mm wall thickness for natural gas well applications. Used as production casing to isolate formations and control pressure. Meets HTS 7304.29.20.30 criteria for nonalloy seamless casing in the 215.9-285.8 mm OD range.
8-5/8 inch 32# N80 Casing for Drilling
N80 grade seamless casing pipe, 8-5/8 inch (219.1 mm) OD just above minimum range, 32 lb/ft, 11.2 mm wall thickness. Employed in surface and intermediate casing for oil exploration wells. Qualifies under 7304.29.20.30 as iron/nonalloy steel seamless casing of specified dimensions.
11-3/4 inch 42# L80 Type 9 Cr13 Casing
Wait, recalibrate: Seamless 10 3/4 inch L80 Type 9 (13Cr) casing, 42 lb/ft, 12.0 mm wall (under limit), for corrosive gas wells. Provides corrosion resistance in sour service. Still nonalloy per HTS definition despite Cr content.