Surface Figure
Surface form tested by interferometry — PV/RMS values from the actual measurement.
Standard Size · Made to Print
2.77 x 22.90 mm Rod Lens — Standard Size, Made to Print
This 22.90 mm relay step is already in production. Send the drawing and get a fit check, tolerance review and quote within 24 hours. No custom-quote wait. Supplied as uncoated rod lens blanks for coating laboratories, or finished per your drawing for OEM assembly, with a measured batch COA. It pairs a 2.77 mm diameter with the 22.90 mm relay pitch used across many rigid scope trains.
✓ ISO 9001:2015
✓ NDA Protected
✓ COA per Batch
✓ MOQ 10+
✓ Quote in 24h
Quick Answer: Φ2.77 × 22.90 mm is a proven production size, supplied uncoated for coating labs or finished per drawing for OEM assembly. Diameter −0.02/−0.04 mm, centration ≤3′, batch COA with measured values, MOQ 10.
Specifications
Standard Specs — Confirmed Against Your Drawing
Final tolerances, glass grade and build type are confirmed against your drawing at quote.
Size Positioning
Where Φ2.77 × 22.90 mm Sits in the Range
Φ2.77 × 22.90 mm pairs a 2.77 mm diameter with a 22.90 mm relay pitch, a standard step for relay trains at this tube diameter.
This size is often used where a 22.90 mm pitch is required and the drawing calls for a slightly reduced diameter.
Design Notes
What to Confirm for Φ2.77 × 22.90 mm
Design note: Φ2.77 mm follows the drawing; confirm whether the target is a single or cemented relay rod.
Two Supply Paths
How We Supply Φ2.77 × 22.90 mm
For Coating Laboratories
Φ2.77 × 22.90 mm is available as an uncoated blank with the −0.02/−0.04 mm diameter fit.
For OEM Assemblers
Finished rods are produced to your drawing with centration ≤3′ and measured batch COA.
Real Production Photos
Φ2.77 × 22.90 mm in Our Production
Photos are production references; final dimensions follow your drawing.
2.77 diameter reference
22.90 length reference
Proven Size
Why Φ2.77 × 22.90 mm Is a Standard
The 22.90 mm pitch is one of the most used steps in the database; at 2.77 mm it provides a proven slim-diameter option.
Drawings first. A drawing is always the fastest way to a precise match — send yours and we take it from there.
In-house production
Factory Checks for Φ2.77 × 22.90 mm
For Φ2.77 × 22.90 mm, ask for the batch COA and we will show measured diameter and centration.
ISO 9001:2015 quality system
In-house since 2009 — no reselling
Measured COA per batch
NDA standard before drawings
24-hour engineer quote
MOQ 10 · glass never substituted
Quality Evidence
Φ2.77 × 22.90 mm — The Numbers Go on Your COA
The Φ2.77 × 22.90 mm COA lists measured diameter, length and centration for the batch.
Inspection & Metrology
We measure it — and the numbers go on your COA.
Every batch is verified with interferometry, centration measurement and surface inspection. You get the actual measured values, not a “within spec” checkbox.
Centration
Centration checked on the centration station, typically ≤3′. The reading shown is from a real part — 2.02′.
Surface Quality
Surface and edge quality inspected under a video microscope — scratch/dig per MIL-PRF-13830B.
What “Pass” Looks Like
A passing surface from a production run: PV 0.51λ, RMS 0.059λ. Rejects never leave the workshop.
Measured COA per batch — ask for a sample COA with your quote. · Learn how to read a surface map →
Real inspection record from this product line
Passing surface record for the Φ2.77 × 22.90 mm process — PV 0.51λ.
Real measurement, kept on file. Your COA gets the same kind of data.
FAQ
Common Questions for Φ2.77 × 22.90 mm
Is Φ2.77 × 22.90 mm a stock size?
Yes, it is a standard size in the production database.
Why choose 2.77 mm instead of 2.78 mm?
The 0.01 mm difference follows the drawing; both diameters are proven production sizes.
Can you supply blanks?
Yes, uncoated blanks with material certificate.
What tolerances apply?
Diameter −0.02/−0.04 mm, centration ≤3′.
Do you provide COA?
Yes, with measured values per batch.
Related
Related Sizes for Φ2.77 × 22.90 mm
Standard Rod Lens Sizes
Full 245-size database, by family.
Rod Lenses — Product Range
Relay and rear rods, Φ1.19–8.0 mm, per drawing.
Applications
Hysteroscope, cystoscope and slim rigid scope optics.
Factory Video
Tour the Factory for Φ2.77 × 22.90 mm
Watch Φ2.77 × 22.90 mm go through grinding, polishing and centration measurement.
See the Factory Live — Schedule a Video Tour
Watch rod lens grinding, polishing, centration measurement and final inspection in real time. All information shared during the tour is confidential — your NDA is welcome.
Schedule a Live Video Tour