tldr: STEEL SCREWS AND BOLTS are classified in Chapter 73, Harmonized Tariff Schedule of the United States (HTSUS) under heading 7318. The tariff has separate p

tldr: STEEL SCREWS AND BOLTS are classified in Chapter 73, Harmonized Tariff Schedule of the United States (HTSUS) under heading 7318. The tariff has separate provisions for the different types of screws and bolts, and separate provisions for threaded and non-threaded fasteners. The tariff pages covering the various types of steel screws and bolts can be found by checking the latest version of the HTSUS at www.usitc.gov.