Surface Figure
Surface form tested by interferometry — PV/RMS values from the actual measurement.
OEM Make-to-Print · Rod Lenses
Rod Lenses for Industrial Borescopes — per drawing
A scratch in the middle of a 46 mm rod is easy to miss and lands in the image path. Surface is checked to 40/20 MIL-PRF-13830B / ISO 10110-7 5/40-20 and recorded on the batch COA. Send the drawing and get the review within 24 hours.
We are a make-to-print manufacturer: you send the drawing, we make the rod lenses — from Φ1.19 mm to Φ8.0 mm.
Glass per your drawing · BBAR 400–700 nm · surface 40/20 MIL-PRF-13830B / ISO 10110-7 5/40-20 · NDA before drawings are shared.
The Problem
Four reasons borescope relay rods fail your build
Relay rods up to 46 mm long — a bad surface or a drifted diameter stalls the whole optical train.
1 · Long rods have long cylindrical surfaces. One scratch or dig in the middle of a 46 mm rod is easy to miss and hard to polish out — and it lands in the image path.
How HSD avoids it: surface is checked to 40/20 MIL-PRF-13830B / ISO 10110-7 5/40-20 and recorded on the batch COA.
2 · Centration decides the relay. Each relay rod has to pass the image straight down the bore; centration error compounds rod after rod.
How HSD avoids it: centration is verified on a per-batch sampling plan per ISO 10110-6, with measured values on the COA.
3 · The “manufacturer” may be a trader. When drawings move through several shops, nobody can explain a repeatability problem.
How HSD avoids it: we are the factory — a 30-person precision optical workshop; your drawing stays with our engineers.
4 · Batch drift kills repeatability. A “within spec” COA hides lot-to-lot shifts that surface as field failures.
How HSD avoids it: every batch COA carries measured values — dimensions, centration, surface, test method.
Industrial builds need rods that behave the same batch after batch — same tolerances, same method, same COA format.
Rod Lens Photos
Real rod lenses from our shop floor
Production photos of long relay rod lenses, labeled by length. Final specifications per your drawing.
14.71 mm
16.08 mm
20.31 mm
22.9 mm
Scope of supply: relay rod lenses (lengths up to 46 mm) · slim relay rods · rear rods · uncoated rod lens blanks — all make-to-print per your drawing.
We are make-to-print: you send the drawing, we make the rod lenses. We don't commit to specifications without a drawing. If we can't do it, we'll say so in the reply.
Specifications
Specifications — per drawing, with site-wide standards
| Item | Specification |
|---|---|
| Rod lens diameter range | Φ1.19–8.0 mm; relay lengths 10–80 mm (per drawing) |
| Diameter tolerance | −0.02 / −0.04 mm (fit) |
| Centration | ≤3′, tighter per drawing |
| Surface quality | 40/20 · MIL-PRF-13830B / ISO 10110-7 5/40-20 |
| Edge chipping | ≤0.05 mm, per drawing · ISO 10110-7 E 0.05 |
| Coating | BBAR 400–700 nm, R<0.5% (per drawing) |
| Glass | Per drawing: JGS1 / H-ZF / H-LAK / H-K9L / N-SK15; material certificates with each batch |
| Length tolerance | Per drawing |
In-house production
Why you can check us
Centration is measured per ISO 10110-6 (≤3′, tighter per drawing) and the measured value goes on the COA — not a "within spec" line. Photo: our inspection bench.
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
FAQ
Common questions
Are you a make-to-print manufacturer?
Yes. You send the drawing, we make the rod lenses — relay rods, rear rod lenses and uncoated blanks.
What relay rod lengths can you make for borescopes?
Relay rods from 10 to 80 mm long, per your drawing; longer configurations reviewed engineer-to-engineer.
What centration can you hold?
≤3′ on rod lenses, tighter if the drawing asks for it. The COA carries measured values, not a within-spec statement.
What's on the COA?
Part number and revision, measured diameter and thickness, measured centration, surface quality and test method. Numbers — not PASS.
What's the MOQ and how fast is a quote?
MOQ 10. Quote within 24 hours of drawing confirmation; samples and production run on the same tolerances and the same process.
Have an industrial borescope rod lens drawing? Make-to-print, quote within 24 hours.
You send the drawing, we make the rod lenses — NDA protected, MOQ 10. If we can't do it, we'll tell you why.
Send Your Drawing →Email [email protected]Application context
Industrial borescope relays: made to the drawing, not to a brand
Industrial borescope rod lenses are specified by drawing because tube length, working length and relay count vary by instrument. This page is the make-to-print route for those drawings.
Check on the drawing: tube length, relay count and working diameter; no model number is needed.
Do you need a model number for industrial borescope rods?
No. A drawing or sample specification is enough; we review geometry, tolerances and surface quality from the drawing.
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
Scratch measurement at the workstation — PV 2.876λ.
Real measurement, kept on file. Your COA gets the same kind of data.
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