7320.20 - Helical springs:

This HTS category, 7320.20, specifically encompasses helical springs, also known as coil springs, manufactured from iron or steel. These springs are characterized by their spiral or coiled form, designed to store and release mechanical energy through torsion or compression. Examples include various types of compression springs, extension springs, and torsion springs utilized across a wide range of industrial and consumer applications.

Distinction from sibling categories is crucial for accurate classification. While 7320.10 covers leaf springs, which are typically flat, layered strips of metal, this category is reserved solely for springs formed into a helical shape. The "Other" category (7320.90) is for any springs of iron or steel not covered by the more specific "leaf" or "helical" classifications.

Within the 7320.20 category, further subdivision is based on the intended use of the helical spring. The subcategory 7320.20.10.00 is designated for helical springs specifically engineered and manufactured for use in motor-vehicle suspension systems. The remaining helical springs, not designated for motor-vehicle suspension, fall under the subcategory 7320.20.50. This differentiation allows for specific trade data collection and potential tariff rate application based on end-use.