6-5/8 Inch Liner Casing Threaded Hanger
6-5/8 inch liner casing with liner hanger threads for tie-back systems in oil wells. Non-alloy steel welded, coupled for hanging production liners. Classified 7306.29.10.90 as threaded drilling casing.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If functioning as liner tubing
Liner tubing smaller diameters use tubing statistical breaks.
If complete liner hanger assemblies
Assembled liner hangers with casing become drilling machinery parts.
If special profile liner threads
Non-round or special thread profiles as tube fittings.
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Import Tips & Compliance
• Liner hanger threads differ from standard casing—document specialized use
• Smaller liner diameters prone to tubing misclassification
• Hanger/packer compatibility affects pressure testing requirements
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