# Cold-Headed & Stamped Parts — CNC Machined to Drawing

> Sinbo Precision (sinbo-machining.com) machines 24 cold-headed & stamped 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.

For volume, machining is not always the right answer. Sinbo runs 8 cold headers (60–180 T) and 50 presses for parts where geometry and quantity justify forming: custom rivets, electrical contacts, battery and harness terminals, cold-headed special screws and stamped shields — tooled in-house, then machined-finished where a print demands it.

## 24 Cold-Headed & Stamped Parts We Machine

- **Solid rivet, custom head** — head forms to print, copper/brass/steel/aluminum.
- **Semi-tubular rivet** — pilot + wall geometry per print.
- **Step rivet** — multi-diameter cold-formed.
- **Shoulder rivet** — head + shoulder one stroke.
- **Electrical contact, cold-headed** — copper alloy, plated after forming.
- **Relay contact** — bimetal or solid, weld-ready back.
- **Spade terminal, stamped** — brass/tin-plated, progressive die.
- **Ring terminal, stamped** — wire-gauge matched, barrel seam options.
- **Battery contact, cold-headed** — spring-temper alloys, plated.
- **Cold-headed shaft, custom head form** — non-standard heads at 60–180 T.
- **Cold-headed special screw** — head formed, thread rolled after.
- **Flanged pin** — cold-formed flange, no machining scrap.
- **Stamped washer** — thickness 0.1–3 mm, OD to 80 mm.
- **Stamped shim** — laminated sets on request.
- **Stamped bracket** — steel/stainless, tapped or weld-ready.
- **Stamped clip** — spring-temper retention geometry.
- **Custom retaining clip** — non-catalog geometry, tooled in-house.
- **Connector lead frame** — progressive die, pitch-controlled.
- **EMI shield can, stamped** — drawn corners, ±0.1 mm.
- **Deep-drawn sleeve** — wall uniformity controlled.
- **Deep-drawn housing** — brass/aluminum/steel draws.
- **Progressive die part, custom** — multi-slide tooling in-house.
- **Stamped contact spring** — BeCu/stainless spring tempers.
- **Cold-headed fitting blank** — machining stock with formed head.

## 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

- [HVDC relay contact case study](https://www.sinbo-machining.com/case/hv-dc-relay-contact/)
- [Electrical connectors](https://www.sinbo-machining.com/case/electrical-connectors/)
- [Solar PV copper terminal](https://www.sinbo-machining.com/case/solar-pv-copper-terminal/)
- [Cold heading service](https://www.sinbo-machining.com/services/cold-heading/)
- [Stamping service](https://www.sinbo-machining.com/services/stamping/)

**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