7318.15.50 - Studs

This HTS category, 7318.15.50, specifically covers "Studs." Studs are threaded fasteners characterized by having threads on both ends and no head, designed to be screwed into a tapped hole at one end and have a nut applied to the other. They are distinct from bolts, which typically have a head, and machine screws, which are generally shorter and designed for use with tapped holes or nuts.

Compared to its siblings, this classification differentiates studs from bolts that are entered or exported with their nuts or washers (7318.15.20) and machine screws of specified dimensions (7318.15.40.00). While all fall under the broader umbrella of threaded articles of iron or steel, the defining characteristic of a stud – its headlessness and dual-threaded nature for through-fastening applications – sets it apart.

The subcategories within 7318.15.50 further refine the classification based on material. The distinction between "Of stainless steel" and "Other" allows for specific tariff treatment based on the alloy composition of the stud, recognizing the varying import duties and trade regulations associated with different grades of steel.