# Eyewear & Optical Components — CNC Machined to Drawing

> Sinbo Precision (sinbo-machining.com) machines 28 eyewear & optical parts to customer drawing in Dongguan, China — quotation within 48 hours, first prototypes in 7–15 days, from 1 piece. IATF 16949 & ISO 9001:2015 certified.

Eyewear hardware is micro-precision at volume: 5/7/9-barrel hinges, ground hinge pins and M1.2–M1.6 screws in brass, nickel silver and 303 stainless, with cosmetic finishes from polished to PVD through audited plating partners. The same cell builds optical hardware — lens retainers, filter rings and C-mount adapters.

## 28 Eyewear & Optical Components We Machine

- **Barrel hinge, 5/7/9-barrel** — brass/nickel silver/303, assembled and pinned.
- **Hinge block** — milled + drilled, leaf alignment ±0.02 mm.
- **Hinge plate** — stamped or milled, countersink geometry.
- **Hinge pin, Ø0.8–1.6 mm** — ground + polished, ends rivet-formed on request.
- **Rivet hinge components** — rivet-post + barrel matched sets.
- **Spring hinge components** — plunger + spring seat, heat-treated plunger.
- **Temple hinge components** — left/right paired sets.
- **Nose pad arm** — brass/303, pad-face angle per drawing.
- **Nose pad mount, push-in** — brass, bayonet or snap geometry.
- **Nose pad screw M1.4** — brass/303, slotted or cross drive.
- **Frame screw M1.2–M1.6** — Swiss-turned, head polish grade A option.
- **Lens screw** — nylon-patch or mechanical lock option.
- **Rim insert** — brass, mold-in knurl.
- **Temple tip insert** — brass core, knurled bond zone.
- **Hinge rivet** — cold-headed head forms, cosmetic heads.
- **Hinge cap** — turned, decorative finish.
- **End piece insert** — rivet-ready geometry.
- **Lens barrel** — aluminum, ID focus thread.
- **C-mount adapter** — 1"-32 UN2A thread, flange distance ±0.05 mm.
- **Filter ring, threaded** — aluminum, M-series threads gauge-checked.
- **Iris diaphragm ring** — brass, blade-slot milling.
- **Stage insert, ground** — aluminum/steel, flatness ≤0.01 mm.
- **Lens retention ring** — aluminum/brass, thread concentric to face.
- **Optical spacer** — ground both faces, parallelism ≤0.002 mm.
- **Objective holder** — 303 stainless, black-finish option.
- **Bridge core** — machined + bent to frame profile.
- **Sunglass hinge components** — salt-spray-proof finish options.
- **Decorative eyewear rivet** — cosmetic head, PVD/painted.

## Typical Materials & Tolerances

| Parameter | Value |
|---|---|
| Metals | Stainless 303/304/316/316L/416/17-4 PH · brass CW617N, DZR CW602N, CuZn39Pb3 · aluminum 6061/7075/6082 · steel 1018/1045/42CrMo4/16MnCr5 |
| Plastics | PEEK · PTFE · POM (Delrin) · nylon · PVDF · polycarbonate |
| Tolerances | ±0.005 mm on critical diameters · DIN ISO 2768-mK general · ground features ±0.002 mm |
| Surface | Ra 0.8 standard machined finish · Ra 0.4 / Ra 0.2 ground · Ra 0.1 lapped |
| Finishes | nickel / zinc / hard chrome / black oxide / anodizing / PVD via audited partners |
| Documentation | EN 10204 3.1 material certificates · FAI · PPAP Level 3 (automotive) · full dimensional report |
| Order range | 1-piece prototypes · batch 100–20,000+ · 2.6 million parts/month capacity |
| Lead time | quotation within 48 hours · first prototypes 7–15 days |

## Related Pages

- [Eyeglass hinges case study](https://www.sinbo-machining.com/case/eyeglass-hinges/)
- [Cosmetics blanks](https://www.sinbo-machining.com/case/cosmetics-blanks/)
- [Brass & copper parts](https://www.sinbo-machining.com/products/materials/copper/)

**Request a quote:** send your drawing to leo.pan@sinbo-machining.com — quotation within 48 hours, no minimum order for prototypes.

Last updated: 2026-09-27