7318.14 - Self-tapping screws:

This HTS category, 7318.14, specifically covers self-tapping screws made of iron or steel. These are fasteners designed to create their own internal threads in materials such as plastic, metal, or wood as they are driven in. Their defining characteristic is the ability to tap their own thread, unlike conventional screws that require a pre-tapped hole or a nut.

Within the broader classification of threaded articles of iron or steel (7318), this subcategory distinguishes itself from other siblings like coach screws (7318.11) or screw hooks and rings (7318.13) by its self-tapping function. It also differs from the general "other screws and bolts" (7318.15) by its specific design for self-threading.

The subcategories within 7318.14 further refine the classification based on the physical dimensions of the screw. 7318.14.10 applies to self-tapping screws with a shank or thread diameter less than 6 mm, while 7318.14.50 covers those with a diameter of 6 mm or more. This dimensional distinction is crucial for accurate tariff assessment.