7318.15.20 - Bolts and bolts and their nuts or washers entered or exported in the same shipment

This HTS category encompasses a broad range of bolts and bolts, including those imported or exported alongside their corresponding nuts or washers. These articles are distinguished by their threaded shafts designed for fastening purposes. The primary criterion for inclusion is that the bolt itself, and any accompanying nuts or washers, are made of iron or steel.

When classifying, it's crucial to differentiate this category from its siblings. Specifically, 7318.15.40 covers machine screws with particular dimensional requirements, and 7318.15.50 pertains to studs. This category, in contrast, covers general bolts and bolt assemblies that do not fit the specific definitions of those sibling categories, focusing on their combined entry with nuts or washers.

The subcategories within this node further refine classification based on the physical dimensions of the bolt's shank or thread. The first subcategory, 7318.15.20.10, addresses bolts with smaller diameters, specifically those less than 6 mm. The subsequent subdivision, "Having shanks or threads with a diameter of 6 mm or more," captures the larger dimension bolts, allowing for precise tariff application based on these critical physical characteristics.