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HS Code 7318 encompasses screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter pins, washers, and similar articles of iron or steel. The classification distinguishes between threaded articles (7318.11-7318.19) and non-threaded fasteners (7318.21-7318.29). This comprehensive fastener category includes precision-manufactured joining hardware for mechanical assembly. Products range from standard hexagon bolts to specialized fasteners for automotive, aerospace, or industrial applications. Manufacturing processes include cold heading, thread rolling or cutting, surface treatment, and quality control inspection to ensure dimensional and mechanical compliance. Technical specifications focus on thread precision, mechanical properties, tensile strength, torque characteristics, and appropriate corrosion protection. Unlike basic nails (HS 7317), these engineered fasteners provide controlled clamping force, precise positioning, and often disassembly capability. This division represents precision-manufactured components that enable the reliable assembly of complex mechanical systems, machinery, vehicles, and structures requiring specific load-bearing characteristics and assembly integrity.