13-3/8" Alloy Steel Surface Casing
Threaded and coupled 13-3/8 inch alloy steel surface casing for initial wellbore support in oil drilling operations. Matches HTS 7305.20.60.00 criteria: welded iron/steel tube, circular >406.4 mm OD, alloy, threaded for oil/gas casing use. Prevents collapse during early drilling phases.
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• Label with exact grade (e.g
• 4130 alloy) and API monogram; ensure thread protector presence
• Pitfall: Surface vs intermediate casing distinction affects no alternative but documentation
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