# Pump & Compressor Components — CNC Machined to Drawing

> Sinbo Precision (sinbo-machining.com) machines 26 pump & compressor 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.

From coffee-machine pump fittings to chemical-process trim, Sinbo machines rotating and sealing pump hardware: 5-axis-milled impellers to Ø300 mm, ground shafts, lapped mechanical-seal seats and wear-ring pairs in 316, 17-4 PH, Monel 400 and engineering plastics. Lapped faces reach Ra 0.1 for seal performance.

## 26 Pump & Compressor Components We Machine

- **Impeller, 5-axis milled** — closed/semi-open/open, Ø20–300 mm, blade profile to CAD.
- **Pump shaft, ground** — 316/17-4 PH, seal journals ground.
- **Shaft sleeve, wear grade** — hardened or stainless, thin wall.
- **Shaft protection sleeve** — under-seal position, Ra 0.2.
- **Gland** — 316 stainless, packing bore ±0.05 mm.
- **Gland follower** — two-piece or one-piece, bolt-hole pitch controlled.
- **Packing ring set** — turned rings, cross-cut on request.
- **Mechanical seal seat, lapped** — 316/PEEK seat face, Ra 0.1, flatness ≤0.001 mm option.
- **Seal gland** — 316 stainless, flush-port drilled.
- **Throat bushing** — bronze/316, clearance-fit ground.
- **Case wear ring** — press-fit OD, clearance bore.
- **Impeller wear ring** — matched to case ring as a pair.
- **Balance piston** — turned + ground, drum lapped OD.
- **Compressor valve plate** — ground + lapped both faces, flatness ≤0.002 mm.
- **Compressor valve seat** — 316, port geometry to print.
- **Compressor piston** — aluminum/steel, ring grooves finished.
- **Piston pin** — hardened, ground, bores both ends.
- **Muffler insert** — brass, flow-ported.
- **Heating pump impeller** — brass/PP, ECM-motor hub options.
- **Magnet carrier cup** — 316, thin-wall deep drawing + machining.
- **Metering pump plunger** — lapped Ra 0.1, Ø1–20 mm.
- **Metering check ball seat** — matched pair, repeatable shut-off tested.
- **Dosing head** — 316/PEEK-lined, port alignment ±0.05 mm.
- **Fluid end body** — 316 stainless, drilled and cross-ported.
- **Pump bracket, milled** — cast or bar aluminum, motor pilot face.
- **Motor mount adapter** — IEC/NEMA pilot options.

## 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

- [US pump & valve case study](https://www.sinbo-machining.com/case/us-pump-valve-parts/)
- [Chemical pump & valve parts](https://www.sinbo-machining.com/case/chemical-pump-valve/)
- [Coffee machine parts](https://www.sinbo-machining.com/case/coffee-machine-parts/)

**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