16-Inch OD Welded Oil Well Casing
Heavy-duty welded casing tube of nonalloy steel with 16-inch (406.4+ mm) external diameter, used in oil drilling to prevent borehole collapse and protect aquifers. Falls under HTS 7305.20.4000 as 'other' non-seamless casing for drilling applications. Features high collapse resistance for intermediate casing strings.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If produced seamless
Seamless manufacturing method moves it to Chapter 73 heading 7304 for oil/gas casing.
If imported assembled with downhole tools
When sold as complete drilling assemblies/parts, shifts to machinery parts under 8431.
If under 406.4 mm diameter
Smaller diameter welded casing falls under the general 7305.20.20 subheading.
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Import Tips & Compliance
• Provide detailed threading specs (e.g
• BTC, STC) and coupling data in entry docs to distinguish from tubing
• Label as 'drilling casing' explicitly; generic 'steel pipe' invites scrutiny under 7306 other welded pipes
• Watch for country-of-origin rules; many suppliers from China/India require Section 232 steel tariffs verification
Related Products under HTS 7305.20.40.00
18.5-Inch Surface Casing Tube
Welded surface casing pipe of iron/nonalloy steel, 18.5-inch OD exceeding 406.4 mm, used in gas well drilling to isolate freshwater zones and provide blowout protection. Fits HTS 7305.20.4000 as other non-seamless casing for drilling. Corrosion-resistant coating standard for longevity.
ASTM A252 Grade 2 Drilling Casing
Welded ASTM A252 Grade 2 steel casing pipe with circular cross section over 16 inches (406.4 mm) OD, for oilfield drilling to line wells and support formations. HTS 7305.20.4000 applies to this nonalloy 'other' casing, distinguished by electric resistance welding (ERW). Ideal for intermediate and production casing.
22-Inch OD ERW Oil Casing Pipe
Electric resistance welded (ERW) casing pipe of nonalloy steel, 22-inch external diameter, for stabilizing oil well bores during drilling. Classified in HTS 7305.20.4000 as other riveted/welded casing over 406.4 mm for oil/gas. High yield strength for deep wells.
Nonalloy Steel Production Casing
Welded production casing strings of nonalloy steel, OD >16 inches, used post-drilling to facilitate oil/gas flow while isolating zones. HTS 7305.20.4000 for other non-seamless iron/steel casing in drilling. Premium grade for long-term well integrity.
17-Inch Intermediate Casing Pipe
17-inch OD welded intermediate casing of nonalloy steel for multi-stage oil drilling support. HTS 7305.20.4000 classification.
API 5CT L-80 Casing Type 13Cr
Welded L-80 Type 13Cr casing >16in OD for corrosive oil environments. Borderline nonalloy per notes.