7318.15.20.20 - Track bolts

This HTS category, 7318.15.20.20, specifically covers track bolts. Track bolts are specialized bolts used primarily in railway construction to fasten together the steel rails to the sleepers (ties). They are characterized by their specific design, often featuring a square neck or a mushroom-shaped head that fits into a corresponding shaped hole in the rail base, preventing rotation during installation and use. These bolts are essential for maintaining the structural integrity and safety of railway tracks.

When classifying bolts at this level, it is important to distinguish them from sibling categories. For instance, "Structural bolts" (7318.15.20.30) are designed for general construction purposes and may have different head shapes and thread specifications compared to track bolts. The category also differentiates from "Bent bolts," which have a deliberately deformed shank, and "Other" bolts that do not fit the specific criteria for track or structural applications. The key differentiator for this code is the intended use in railway track assembly, which dictates its unique design and application.

As this is a leaf node in the HTS structure, there are no further subcategories to introduce. The classification of "Track bolts" is the most granular level for this specific item. Therefore, classification relies on accurately identifying the product as a bolt specifically designed and manufactured for railway track fastening. Factors such as head shape (often countersunk or mushroom-shaped), shank configuration (potentially with a square neck), and thread diameter of 6 mm or more are critical in confirming its placement within this code.