Spring wire has its own dedicated line (7223001005) based on its intended use and typically tighter mechanical property specifications. Wire intended for welding electrodes or filler metal, however, may classify under Chapter 83 (specifically heading 8311) rather than Chapter 72, depending on whether it is coated or prepared for welding. Importers should confirm the product's specification and intended use before classification, as the chapter-level distinction between raw wire and prepared welding wire is a common audit issue.

Flat stainless wire (7223005000) is distinguished from flat-rolled strip primarily by its width-to-thickness ratio and production method — wire is drawn or rolled from rod, while strip is rolled from slab or coil. CBP generally applies the rule that if the width does not exceed 10 times the thickness, the product may be considered wire rather than strip. Importers of narrow flat stainless products should carefully evaluate this boundary, as misclassification between Chapter 72 wire and flat-rolled strip headings is a recurring compliance issue.