7 Inch K-55 BTC Coupled Casing
K-55 grade 7-inch casing with Buttress Threaded and Coupled (BTC) connections for production zones in gas wells. Under HTS 7306.29.31.00 for its welded, threaded design tailored to oil/gas drilling. Offers balanced strength and cost for intermediate applications.
Import Duty Rates by Country of Origin
Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If welded and longitudinally submerged arc (LSAW) for large diameters
Specific welding method for certain large casings changes subheading.
If specialized for pump/compressor use in drilling
Parts of pumps used in drilling may go to Chapter 84.
If used as drill pipe rather than casing
Drill pipes, even if similar, have distinct classification.
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
• Use ISPM-15 certified wooden dunnage for shipping to prevent quarantine issues
• Document exact coupling type (BTC, STC) as mismatches cause rejections
Related Products under HTS 7306.29.31.00
12-1/4 Inch P-95 Coupled Casing
P-95 12-1/4 inch coupled casing for frac wells. HTS 7306.29.31.00 classification.
5-1/2 Inch H-40 Threaded Production Casing
H-40 grade 5-1/2 inch threaded production casing for hydrocarbon flow zones. HTS 7306.29.31.00 applies to this welded, coupled steel for oil/gas drilling. Cost-effective for shallow productions.
8-5/8 Inch L-80 Premium Threaded Casing
Premium threaded L-80 8-5/8 inch casing with VAM connections for sour service wells. Fits HTS 7306.29.31.00 as advanced welded threaded casing for gas/oil. H2S-resistant for harsh fields.
14 Inch Q-125 Coupled Casing
Ultra-high strength Q-125 14-inch coupled casing for HP/HT wells. HTS 7306.29.31.00 for extreme-duty welded threaded steel in drilling. Withstands 125 ksi yield.
18-5/8 Inch X-56 Threaded Casing
X-56 grade 18-5/8 inch threaded casing for large bore oil wells. Under HTS 7306.29.31.00 as coupled welded for drilling.
6-5/8 Inch T-95 Coupled Casing
T-95 grade 6-5/8 inch coupled for thermal recovery wells. HTS 7306.29.31.00 threaded steel for oil.