4-1/2 Inch 12.6 lb/ft N80-1 Stainless Casing
Liner casing 4-1/2 inch with N80-1 grade stainless steel, threaded and coupled for intermediate hole sections. Used in horizontal drilling applications. HTS 7304.24.30 due to seamless stainless construction and oilfield casing function.
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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 imported in random lengths without threads
Plain end stainless tubes under 152.4mm OD classify under general tube headings.
If when imported with factory-installed centralizers
Parts of drilling rigs including pre-assembled casing accessories fall under Chapter 84.
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Import Tips & Compliance
• Ensure coupling stock certificates trace to same heat as pipe body
• Document premium class thread inspection (VAM TOP, USCO) if not standard API
• Verify collapse and burst ratings meet or exceed API 5CT minimums
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