What processing tolerances can you achieve for optical glass parts?

Update Time:2026/4/28

At Felix Glass, we maintain strict processing tolerances for all BK7 and K9 optical glass parts to ensure consistent quality and performance for your applications. Our tolerance standards cover three key areas: dimensional accuracy, surface quality, and optical performance.

For dimensional accuracy, we can achieve a typical tolerance of ±0.01mm for most standard optical glass parts. For high-precision applications, we can provide tighter tolerances down to ±0.005mm, depending on the complexity of the part and the material specifications. Our CNC machining equipment is calibrated regularly to ensure consistent accuracy across all production batches.

In terms of surface quality, we can achieve a surface roughness of up to Ra 0.005μm, which ensures high optical clarity and minimal light scattering. We also control surface flatness, with typical flatness tolerances up to λ/10 at 632.8nm for precision applications. For anti-reflective coated parts, we also ensure coating uniformity and adhesion to meet industry standards.

Optical performance tolerances include transmittance and refractive index consistency. Our BK7 and K9 optical glass parts are tested for visible light transmittance, with typical values above 91% for uncoated parts and above 98% for AR-coated parts. We also ensure consistent refractive index across all batches to avoid variations in optical performance.

All our processing tolerances are verified through rigorous quality control testing, including dimensional inspection with coordinate measuring machines (CMM), surface roughness testing, flatness measurement with interferometers, and optical transmittance testing with spectrophotometers. This comprehensive quality control process ensures that every optical glass part we produce meets the required specifications.

If you have specific tolerance requirements for your project, please contact us with your detailed specifications, and our engineering team will confirm our capabilities and provide you with a customized solution.

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Learn more from our FAQ

What is your MOQ for custom optical glass and display glass parts?: Felix Glass offers highly flexible MOQ to support client projects, including prototype testing, small batch trial orders and large-volume mass production. All products can be fully customized according to your drawings, tolerances and application standards. Send us your specs to get an accurate price quote within 24 hours.

Can I get free glass samples for testing before bulk order?: Yes, our FELIX GLASS factory supports sample testing for a wide range of precision optical glass components and assemblies. The lead time for sample production is 3 to 7 working days. Please contact us today to arrange samples and obtain a customized solution that meets your needs.

What is the production lead time for custom optical glass components?: What is the production lead time for custom optical glass components?
Answer: The lead time for standard samples is 3–7 business days, while mass production takes 15–25 business days, depending on product complexity and order volume. We provide reliable, rapid delivery for orders serving the industrial, medical, automotive, and aerospace sectors. Please submit your project details to receive an accurate delivery schedule.

Are your optical glass products ISO, CE and RoHS certified?: All FELIX GLASS precision optical glass components comply with ISO quality system standards, as well as CE and RoHS requirements. We provide comprehensive test reports, material certificates, and inspection documentation for customer review. Please feel free to request full certification details and a formal quotation today.

Do you offer one-stop custom optical glass processing services?: Yes. We provide a full range of in-house processing services, including CNC machining, precision grinding, optical polishing, vacuum coating (AR, AF, AG, IR), tempering, and screen printing. Every step—from raw material to finished product—is carried out within our own facility. Please let us know your requirements, and we will provide you with the most cost-effective solution.

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What processing tolerances can you achieve for optical glass parts?

A specialist in precision optical glass with 19 years of experience, providing comprehensive, satisfying custom solutions.

A specialist in precision optical glass with 19 years of experience, providing comprehensive, satisfying custom solutions.