Allied products include items made from bonded leather, coated fabrics, or other leather substitutes that serve the same commercial function as genuine leather goods. For HTS classification, the distinction between genuine leather, composition leather, and plastic or textile substitutes is critical because each material category falls under a different heading with a different duty rate.

Industrial leather components are typically classified outside HTS Chapter 42 (which covers personal leather articles) and may fall under chapters related to their end-use machinery or function. For example, leather transmission belting has its own HTS provision, and misclassifying it as a general leather article can result in incorrect duty assessment. Consulting a customs broker familiar with industrial goods classification is advisable.