4 inch C90 Casing with Premium Threads from China
C90 grade seamless alloy steel casing, 4 inch OD, wall thickness <12.7 mm, with premium BIG ALPHA VAM threaded and coupled connections for high torque applications. Used in extended reach drilling. Classified 7304.29.31.10 for oil/gas drilling casing specifications.
Duty Rate — China → United States
35%
Rate breakdown
9903.03.0110%Except for products described in headings 9903.03.02–9903.03.11, articles the product of any country, as provided for in subdivision (aa) of U.S. note 2 to this subchapter
9903.91.0125%Effective with respect to entries on or after September 27, 2024, articles the product of China, as provided for in subdivision (b) of U.S. note 31 to this subchapter
Import Tips
• Premium connection running procedures must be documented
• C90 collapse ratings require validation through FEA analysis records
• Distinguish from standard API connections for proper valuation