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HS Code 7307 encompasses tube or pipe fittings of iron or steel. The classification includes detailed subcategories for cast fittings (7307.11-7307.19), stainless steel fittings (7307.21-7307.29), and other steel fittings (7307.91-7307.99), with distinctions based on specific fitting types including flanges, threaded elbows, butt welding fittings, and others. This fluid system components category includes connection and direction-change elements for tubular networks. Products range from simple threaded couplings to complex manifold systems for industrial processes. Manufacturing processes include casting, forging, machining, or fabrication from pipe sections, followed by threading, surface treatment, or other finishing operations. Technical specifications focus on pressure ratings, dimensional compatibility with corresponding pipe standards, thread specifications, and material performance characteristics for the intended service environment. This division represents specialized components that enable the creation of complex piping systems, supporting applications from residential plumbing to industrial process systems and urban infrastructure networks.