Import Bk7 Windows — Buy in Bulk from Supplier in China

BK7 windows from Changchun Yutai Optics Co., Ltd. are precision optical components made from borosilicate crown glass, designed for use in visible and near-infrared spectral ranges. The standard diameter tolerance is +0.0 mm to -0.15 mm, with thickness tolerance held at +/-0.1 mm and parallelism maintained to ensure minimal beam deviation. These windows are commonly used as protective covers or beam entry points in laser systems, imaging assemblies, and spectrometer housings.

BK7 glass is a standard optical material with a refractive index of approximately 1.517 at 587.6 nm and low internal transmission loss below 1% per surface when uncoated. The supplier does not specify coating options, but the material is routinely compatible with anti-reflection films across 400 nm to 700 nm. Surface quality typically meets 60-40 scratch-dig standards unless otherwise requested. No mention is made of surface flatness or wavefront distortion, so buyers should confirm these if used in interferometric applications.

These windows are purchased by manufacturers of optical instruments, research labs, and industrial laser system integrators. Orders are typically fulfilled in batches of 10 to 500 units, depending on application volume. Packaging is standard in protective foam-lined boxes, with individual units separated to prevent edge chipping. Lead time and minimum order quantities are not stated and must be confirmed directly with the supplier.

Changchun Yutai Optics Co., Ltd. is a manufacturer based in Changchun, Jilin Province, China, with a verified business address and active sourcing presence on industrial platforms. The company is categorized as a harbor-tier supplier, indicating established trade activity, though no public response rate or average reply time is available. Their listing focuses exclusively on optical components, particularly windows and substrates made from optical glasses such as BK7 and fused silica.

The supplier does not claim certifications, years in operation, production capacity, or client names. No information is provided about in-house coating capabilities, metrology equipment, or quality control processes beyond the stated tolerances. Buyers should treat this as a direct manufacturer of basic optical components, not a full-service optical systems provider. Verification of specifications through sample requests is strongly advised before bulk orders.