# Pipe Fittings & Machined Connectors — CNC Machined to Drawing

> Sinbo Precision (sinbo-machining.com) machines 43 pipe fittings 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.

Threaded fittings are a volume game: bar-fed CNC lathes running unattended, 100% thread gauging, and plating partners for nickel, chrome and zinc finishes. Sinbo machines fittings in CW617N and DZR CW602N brass, 303/316/416 stainless and aluminum, from M5 to G2, NPT/NPTF, BSP/BSPP/BSPT, metric and ORFS — with pressure-test and leak-test documentation on request.

## 43 Pipe Fittings & Machined Connectors We Machine

- **Hex nipple** — close, long and reducing forms; CW617N brass or 316 stainless, thread gauged 100%.
- **Reducing hex nipple** — two thread sizes single setup, concentricity ≤0.05 mm.
- **Hex bushing** — brass or stainless, male OD × female ID per drawing.
- **Hex plug** — brass/316, with or without magnet bore.
- **Socket plug** — countersunk internal hex, flush finish.
- **Threaded cap** — female thread + hex or knurl drive.
- **Round coupling** — socket-weld or threaded, bore-to-bore ±0.05 mm.
- **Hex coupling** — brass or 316 stainless, both threads tapped in one clamping.
- **Union body, nut and cone set** — three-piece matched set, cone angle 60°/24° options.
- **Compression fitting body** — brass, EN 1254-style geometry.
- **Compression ferrule ring** — brass or nylon, matched to body taper.
- **Flare fitting half** — 45° SAE flare, flared face Ra 1.6.
- **Flare nut** — brass or aluminum, six flats after thread.
- **JIC 37° fitting** — steel or 316 stainless, 37° seat ground.
- **BSP/NPT adapter** — brass or 303 stainless, mixed thread standards single part.
- **Metric-to-BSP adapter** — brass, gauge-checked threads both ends.
- **Bulkhead fitting** — 316 stainless, locknut face machined for O-ring seal.
- **Panel mount fitting** — front-panel thread + rear compression, one-part flow path.
- **Hose barb, single and multi-wing** — brass/303/316, barb OD tolerance for push-on hose.
- **Hose insert stem** — turned + ground stem, optional collar.
- **Quick coupler nipple** — hardened steel or 316, ground seating cone.
- **Quick coupler socket** — brass or steel, ball-retention geometry milled.
- **Pneumatic elbow insert** — brass, internal flow bore deburred.
- **Banjo fitting** — 316 stainless or steel, cross-flow hole drilled.
- **Banjo bolt with drilled passage** — 10.9 steel or 316, single/double oil feed, hole position ±0.05 mm.
- **Tee fitting** — brass or stainless, both branches from bar, 90° ±0.1°.
- **Cross fitting** — brass, four-way thread alignment.
- **Street elbow** — male × female thread, machined hex on both ends.
- **90° machined elbow** — 316 stainless from solid, smooth internal radius.
- **Manifold block** — aluminum or steel, drilled and cross-drilled galleries, pressure tested.
- **Gauge adapter** — brass, G1/4–G1/2 back connections.
- **Gauge snubber** — 316 stainless, internal porous restriction element housing.
- **Pigtail syphon tube** — 316 stainless, bent and machined, G1/2 typical.
- **Swivel fitting** — brass or steel, rotating collar with retaining groove.
- **Grease fitting, machined brass** — DIN 71412-style ball check.
- **Magnetic drain plug** — steel with press-fitted magnet, thread gauged.
- **Sight glass fitting** — brass or 316, glass seat face lapped.
- **Breather fitting** — brass, sintered vent insert pocket.
- **Cylinder port fitting** — aluminum-safe brass, shallow thread stop.
- **Service valve fitting** — brass, refrigeration flare + Schrader pocket.
- **Camlock adapter** — aluminum/brass/316, cam-arm geometry milled.
- **Tube sleeve (ferrule)** — ground OD, cut to length ±0.1 mm.
- **Tube insert liner** — 316 stainless, light press fit.

## 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

- [Brass press fittings case study](https://www.sinbo-machining.com/case/brass-press-fittings/)
- [Shipbuilding valve fittings](https://www.sinbo-machining.com/case/kr-shipbuilding-valves/)
- [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