7315.20 - Skid chain:

This HTS category, 7315.20, specifically covers "Skid chain." These are chains designed for enhancing traction on vehicles, particularly for use on slippery surfaces like snow, ice, or mud. Skid chains are typically constructed from iron or steel and are intended to be fitted over tires.

While the broader heading 7315 encompasses various types of chain and parts thereof, 7315.20 focuses exclusively on skid chains, differentiating them from articulated link chains (7315.11 and 7315.12) and other miscellaneous chains. The key distinguishing feature is the specific application of these chains in providing enhanced grip and preventing slippage for vehicles.

The subcategories within 7315.20 further refine classification based on a critical physical characteristic: the diameter of the chain. 7315.20.10.00 applies to skid chains where the diameter of the links does not exceed 8 mm, whereas 7315.20.50.00 covers those with links exceeding 8 mm in diameter. This distinction is important for determining appropriate customs duties and trade statistics.