3-1/2 inch T95 Casing with STC Threads
High-strength T95 seamless alloy steel casing, 3-1/2 inch OD, Surface Thread Casing (STC) connections, wall thickness <12.7 mm for tie-back and shallow conductor applications. Provides collapse resistance in unconsolidated formations. HTS 7304.29.31.10 classification for threaded/coupled oil/gas casing.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If thicker wall for high collapse applications
Wall ≥12.7 mm casing for extreme pressure classified in .50 series.
If welded alloy steel casing
Welded construction changes from seamless 7304.29 to welded 7304.59.
If imported as precision mechanical tubing
Same specs but marketed for non-drilling mechanical applications classify differently.
Not sure which classification is right?
Our AI classifier can analyze your specific product and recommend the correct HTS code with confidence.
Import Tips & Compliance
• Confirm minimum yield strength documentation for T95 grade (655 ksi)
• Provide connection make-up torque specifications for STC threads
• Label clearly as 'oil well casing' to distinguish from line pipe
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