7304.29.50.75 - Having an outside diameter exceeding 406.4 mm

This HTS category, 7304.29.50.75, specifically classifies seamless tubes and pipes made of iron or nonalloy steel that are designed for drilling operations in the oil and gas industry. These articles are characterized by having an outside diameter strictly greater than 406.4 mm. This designation ensures that exceptionally large diameter casing, tubing, or drill pipe used in demanding geological conditions are accurately identified for customs purposes.

Distinguishing this category from its siblings is crucial for precise classification. While all fall under casing, tubing, and drill pipe for oil and gas, the differentiating factor is the external diameter. Siblings cover smaller diameter ranges: not exceeding 114.3 mm, exceeding 114.3 mm but less than 215.9 mm, and those ranging from 215.9 mm up to and including 406.4 mm. This specific entry accounts for the largest diameter seamless pipes and tubes used in this sector.

As a leaf node, this classification does not have further subcategories. Therefore, the focus for classification within 7304.29.50.75 is solely on confirming that the seamless iron or nonalloy steel tube or pipe is intended for oil and gas drilling and possesses an outside diameter exceeding 406.4 mm. Practical application involves verifying the product's specifications against this diameter threshold.