4 inch C90 Casing with Premium Threads
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.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If imported uncoupled
Casing imported without couplings may classify differently.
If part of completion equipment
Specialized casing for well completion tools may classify under oilfield equipment.
Not sure which classification is right?
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Import Tips & Compliance
• Premium connection running procedures must be documented
• C90 collapse ratings require validation through FEA analysis records
• Distinguish from standard API connections for proper valuation
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