Screws|HTS Code

Screws harmonized system code

Product Overview Screws entered under HTS 7318.15 are threaded iron or steel fastening devices designed to secure components by engagement of external threads with mating internal threads or substrate material. Key characteristics include nominal metric diameters (typical range M1.6–M36), lengths in millimetres, thread form (ISO metric coarse/fine), head styles (pan, hex, countersunk), drive types (Phillips, Torx, slotted), and mechanical property classes (for example 4.8, 8.8, 10.9). Typical processing steps are cold forming, thread rolling, heat treatment for elevated strength, and surface finishing such as electro-galvanizing (commonly 5–25 µm Zn), hot-dip galvanizing (>45 µm Zn), black oxide, or passivation for stainless variants. Within 7318.15 commercial distinctions are often drawn between machine screws, self-tapping versus thread-cut types, coated versus uncoated items, and structural versus non-structural grades. Primary commercial applications include machinery and equipment assembly, automotive components, electrical enclosures, construction fixings, furniture manufacture and spare-part distribution across retail and industrial supply chains. HTS Code Classification & Trade Specifications HTS 7318.15 sits in Chapter 73 (Articles of iron or steel) → Heading 7318 (screws, bolts, nuts, washers and similar articles of iron or steel) → Subheading 7318.15 (six‑digit code for screws of iron or steel). Classification rationale: items predominantly of iron or steel, formed as external-threaded fasteners intended for mechanical assembly (as opposed to nails, rivets or non-threaded fixings) are allocated here based on form, function and material composition. Trade considerations: standard commercial packing is inner polybags (20–1,000 pcs) inside corrugated cartons or small kegs, palletized on 80×120 cm or 100×120 cm pallets with stretch-wrap; gross carton weights typically 5–25 kg. Preservation/shipping practice includes oil/VCI protection for sea transit, desiccant when required, and segregation of coated versus stainless items. Applicable quality standards commonly cited are ISO 898‑1/ISO 3506, DIN/ASTM property class designations (e.g., 8.8 ≈ 800 MPa tensile), ISO thread tolerances (ISO 261/965) and RoHS/REACH declarations where relevant.

Screws Chapter Note

1.- In this Chapter the expression “cast iron” applies to products obtained by casting in which iron predominates by weight over each of the other elements and which do not comply with the chemical composition of steel as defined in Note 1 (d) to Chapter 72. 2.- In this Chapter the word “wire” means hot or cold-formed products of any cross-sectional shape, of which no cross-sectional dimension exceeds 16 mm.