HTS 830910 covers crown corks specifically — the familiar crimped-edge bottle caps — as well as other stoppers, caps, and lids of base metal used for bottles, jars, and similar containers. Screw caps and threaded closures may also fall here, but closures that are integral parts of a container or that function primarily as packaging (e.g., aerosol valves) may classify elsewhere. The form, function, and method of sealing are the key classification factors.

Metal closures intended for direct food or beverage contact may be subject to FDA requirements under food-contact materials regulations, particularly regarding coatings or liners that contact the product. Importers should confirm that any interior lining or gasket material complies with applicable FDA food-contact standards before entry.