8-5/8 inch 32# N80 Casing for Drilling
N80 grade seamless casing pipe, 8-5/8 inch (219.1 mm) OD just above minimum range, 32 lb/ft, 11.2 mm wall thickness. Employed in surface and intermediate casing for oil exploration wells. Qualifies under 7304.29.20.30 as iron/nonalloy steel seamless casing of specified dimensions.
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Alternative Classifications
This product could be classified differently depending on its characteristics or intended use.
If for alloy steel versions
N80-1 or quenched/tempered variants containing alloying elements > specified limits classify as alloy.
If imported as complete drill string assemblies
Assembled with tool joints, becomes parts of oil/gas drilling machines.
Not sure which classification is right?
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Import Tips & Compliance
• Measure OD precisely as 219.1 mm meets minimum 215.9 mm threshold; provide gauge reports
• Include collapse and burst test data from MTC to validate oilfield application
• Separate pup joints (<3m) may classify under 7304.90 as unfinished tubes
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