Application‑level Automotive Nylon Industrial Yarn segmentation maps yarn usage across five high‑growth vehicle subsystems: seat‑belt reinforcement, airbag fabrication, engine‑cover components, electrical wiring harnesses, and underbody trim. Seat‑belt reinforcement consumes the largest portion, approximately 38 % of yarn volume, because regulatory safety standards demand high‑strength, heat‑resistant yarns. Airbag fabrication follows with 27 % of the market, leveraging multifilament yarn’s fine denier and rapid deployment characteristics. Engine‑cover components, which require thermal stability and chemical resistance, represent 18 % of consumption, primarily sourced from monofilament yarns. Electrical wiring harnesses, increasingly integrated with lightweight composites, account for 10 % of the yarn demand, reflecting the shift toward nylon‑based insulation solutions. Underbody trim, focused on corrosion protection and acoustic damping, occupies the remaining 7 % of the market. These application shares collectively define the Automotive Nylon Industrial Yarn segmentation, illustrating how functional requirements across vehicle architectures drive distinct demand patterns.