7304.29.50.60 - Having an outside diameter of 215.9 mm or more but not exceeding 406.4 mm

This HTS classification, 7304.29.50.60, specifically covers seamless tubes and pipes made of iron or nonalloy steel that are used in drilling for oil or gas. The defining characteristic of this category is its size, encompassing products with an outside diameter measuring 215.9 mm or more but not exceeding 406.4 mm. These are typically robust tubular goods designed to withstand the demanding conditions of oil and gas exploration and extraction.

Distinguishing this category from its siblings is crucial for accurate classification. Categories with smaller diameter ranges, such as those not exceeding 114.3 mm or exceeding 114.3 mm but less than 215.9 mm, are classified separately. Similarly, tubing with an outside diameter exceeding 406.4 mm falls under a different sub-classification. This specific category acts as a distinct grouping for medium to large diameter oil and gas drilling tubing within the broader seamless steel tubing classification.

As a leaf node, this category represents the most granular level of classification for these specific dimensions of oil and gas drilling tubing. Therefore, the classification relies solely on the precise outside diameter measurement to differentiate it from its immediate sibling categories, ensuring that the correct tariff rate and import/export regulations are applied. The material composition remains iron or nonalloy steel, and the application is specifically for oil and gas drilling purposes, as established by the parent headings.