7304.29.31.60 - Having a wall thickness of 12.7 mm or more

This HTS classification pertains to seamless pipes and tubes, specifically those made of iron or steel, designed for use in oil and gas drilling operations. Within this category, we are focusing on "casing" pipes which are employed to line boreholes. The material composition is defined as "other alloy steel," meaning it's not carbon steel but incorporates other alloying elements to enhance its properties. Furthermore, these pipes must be threaded or coupled, indicating they are ready for connection in a wellbore.

The critical distinction for this specific sub-classification lies in its physical dimensions. It covers casing pipes that have an outside diameter falling within the range of 285.8 mm to 406.4 mm. This precisely defined diameter range separates these items from casing with smaller or larger outside diameters.

Crucially, this classification is further refined by a wall thickness requirement. This category specifically covers casing pipes where the wall thickness is 12.7 mm or greater. This differentiates it from the sibling category (7304.29.31.50), which covers similar casing pipes but with a wall thickness less than 12.7 mm. The precise measurement of wall thickness is therefore a key determinative factor for correct classification.