Lead screw Hs Code

Lead screw harmonized system code

Product Overview Lead screws classified under HS Code 731815 are precision-engineered mechanical components primarily composed of steel alloys, designed to convert rotational motion into linear motion with high accuracy and repeatability. These components exhibit exacting physical specifications, typically featuring standardized thread pitches, diameters ranging from 10 mm to over 100 mm, and lengths tailored to industrial requirements. Their manufacturing involves advanced machining processes such as thread rolling, grinding, and heat treatment to ensure enhanced surface finish, dimensional stability, and wear resistance. The HS Code 731815 encompasses various subcategories including threaded rods, screws, and bolts distinguished by thread type, tensile strength, and surface coatings. Lead screws under this classification are extensively utilized across food service machinery, retail automation systems, and food processing equipment, where precise linear actuation and load-bearing capacity are critical. Positioned as integral components in automation and mechanical transmission, these lead screws offer robust performance, corrosion resistance, and compliance with international mechanical standards, thereby supporting efficient operations in high-demand industrial environments. HS Code Classification & Trade Specifications The HS Code 731815 falls within Chapter 73, which covers “Articles of Iron or Steel,” specifically under Heading 7318 for “Screws, bolts, nuts, coach screws, screw hooks, rivets, cotters, cotter-pins, washers (including spring washers) and similar articles.” The subheading 731815 precisely classifies lead screws and similar threaded fasteners composed of iron or steel. This classification is based on the product’s material composition, mechanical function, and standardized thread geometry in accordance with ISO and DIN norms. Trade considerations for these lead screws include packaging in corrosion-inhibiting, moisture-resistant materials such as sealed plastic bags or metal containers, often accompanied by desiccants to preserve integrity during maritime or air freight. Typical shipping units conform to palletized bundles with protective bracing to prevent deformation. Quality standards adhere to ISO 9001-certified manufacturing protocols, with dimensional tolerances maintained within ±0.05 mm and tensile strength ratings exceeding 800 MPa for high-grade variants. Compliance with WTO regulations and customs documentation mandates accurate HS classification to facilitate smooth import/export processes, tariff assessments, and trade compliance verification across global markets.

Lead screw 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.