9-5/8 Inch K55 Coupled Oil Well Casing
9-5/8 inch outer diameter K55 grade threaded and coupled casing for oil well applications, constructed from nonalloy steel. The couplings ensure pressure-tight seals in drilling operations. Fits 7306.29.10 for welded, threaded iron/nonalloy steel casing used in oil/gas drilling.
Import Duty Rates by Country of Origin
More Specific Codes
This product may fall under a more specific subheading:
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If made of stainless steel
Stainless steel casing shifts to 7306.29.21 due to material composition in Chapter 73 notes.
If imported as part of complete drilling equipment
When assembled into drilling rigs or machinery, it may classify under parts of oilfield machinery.
If for water well drilling use
Casing not specifically for oil/gas drilling may fall under other welded tubes in 7306.30.
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
• Include detailed dimensional specs (OD, weight per foot) and coupling type (e.g
• STC) in commercial invoice
• Ensure end-user declaration specifies oil/gas drilling to prevent reclassification as general pipe
• Watch for anti-dumping duties on certain origins; verify with CBP for country-specific rates
Related Products under HTS 7306.29.10
4-1/2 Inch Intermediate Casing Coupled
Slim 4-1/2 inch intermediate casing, J55 grade with flush threaded couplings for mid-depth oil well support. Nonalloy welded steel. Classified in 7306.29.10 for threaded drilling casing.
16 Inch Surface Casing API Threaded
16-inch surface casing with API 8-round threads and couplings, nonalloy steel for shallow well protection. Essential first string in drilling. 7306.29.10 for threaded/coupled type.
10-3/4 Inch H40 Coupled Casing String
H40 grade 10-3/4 inch casing string, fully threaded and coupled for oilfield use. Lower yield strength nonalloy steel. Under 7306.29.10 as welded threaded casing.
Premium LTC Threaded Casing 8-5/8 Inch
8-5/8 inch casing with Long-Threaded and Coupled (LTC) connections, N80 nonalloy steel for reliable seals. Welded for drilling ops. 7306.29.10 classification.
C-90 Grade Threaded Oil Casing 12-1/4 Inch
C-90 grade nonalloy casing, 12-1/4 inch with integral threaded ends for oil production. High collapse resistance. Fits threaded 7306.29.10.
5-1/2 Inch L80 Type 9 Cr Casing Coupled
Restricted alloy L80 Type 9 Cr (9% chromium) casing, but nonalloy base, 5-1/2 inch threaded. For sour service wells. 7306.29.10 if confirmed nonalloy.