U.S. imports of Clock and Watch Glasses, Unworked Spectacle Glass, and Hollow Glass Spheres (SITC 66494) totaled $867K in August 2026, imported from 12 countries.
Importers of Clock and Watch Glasses, Unworked Spectacle Glass, and Hollow Glass Spheres paid $115K in duties in August 2026, an average duty rate of 13.30% — duty actually collected as a share of the imports that cleared customs, not the published tariff schedule. Clock and Watch Glasses, Unworked Spectacle Glass, and Hollow Glass Spheres imports of $867K in August 2026 ran 24% above the year-to-date monthly average of $699K.
Last updated: August 2026 dataA technically diverse grouping united by the absence of optical working, this heading covers protective cover glasses for timepieces, glass blanks for spectacle lenses that have not yet been ground or polished to a prescription, and hollow glass microspheres and sphere segments used in industrial applications such as reflective road markings and syntactic foam. The distinction between optically worked and unworked spectacle glass is the critical classification boundary: once a lens blank is ground to a prescription or coated for optical performance, it moves to the optics headings. Hollow glass microspheres are also used as lightweight fillers in aerospace composites, giving this heading an unexpectedly broad industrial footprint.
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59 import shipments a month
Optical working—grinding, polishing, or coating a blank to achieve a specific refractive correction or optical function—is the threshold. Unground, unpolished glass blanks cut to shape for spectacle frames remain here; once the surface is worked to a prescription or anti-reflective coating is applied for optical purposes, the product reclassifies under the optical elements headings.
Hollow glass microspheres serve as lightweight fillers in syntactic foams, aerospace composites, and reflective pavement markings. End-use does not change their classification at import; they are classified by their physical form as hollow glass spheres within this heading regardless of the downstream application.
Basic heading 66494 · $867K of $27.0B
Imports · August 2026
origin
Switzerland and China together supply 100% of it.
customs district
Census does not publish district detail for this classification system.
destination
Census does not publish state detail for this classification system.
entry
Census does not publish port detail for this classification system.
ImportsExports
Imports
$867KYoY · free account
Exports
$250KYoY · free account
12-mo low · imports
Low · free accountOver the twelve months to August 2026, the U.S. imported $7.5M of Clock and Watch Glasses, Unworked Spectacle Glass, and Hollow Glass Spheres and exported $3.4M.
Through August 2026. Source: U.S. Census Bureau.
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