HTS chapter 40 subdivides rubber hoses by reinforcement type—textile-reinforced, metal-reinforced, or without reinforcement—as well as by whether they are combined with fittings. Each construction type may fall under a different subheading with a different duty rate, so the manufacturer's technical specification sheet is essential for accurate classification.

Conveyor belts of rubber are specifically provided for in HTS chapter 40 and are classified there regardless of width, while flat transmission belting may fall under a different subheading. The distinction turns on the belt's designed end-use and construction; importers should obtain a written product description from the manufacturer and, if uncertain, seek a CBP binding ruling to avoid reclassification at entry.