# Pneumatic & Hydraulic Components — CNC Machined to Drawing

> Sinbo Precision (sinbo-machining.com) machines 37 pneumatic & hydraulic 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.

Motion components live on two numbers: spool-to-bore clearance and rod surface finish. Sinbo grinds directional spools to ±0.002 mm, turns cylinder pistons with groove geometries for any seal brand, and supplies ground piston rods ready for hard chrome. Aluminum manifolds are drilled, cross-drilled, threaded and pressure tested before ship.

## 37 Pneumatic & Hydraulic Components We Machine

- **Cylinder piston** — aluminum or steel, seal grooves to brand specification.
- **Piston rod, ground** — induction-hardened, Ra 0.2 ready for hard chrome.
- **Rod end, male/female thread** — steel, ball-swivel variants included.
- **Rod clevis** — carbon steel, pin hole H7.
- **Rod eye** — with spherical bearing seat.
- **Cylinder head / cap** — aluminum, seal faces single-setup.
- **Guide rod** — ground, end-threaded.
- **Anti-rotation guide** — flat-milled, hardened.
- **Cushion sleeve** — brass/steel, tapered land.
- **Cushion adjusting screw** — fine-pitch thread, hardened tip.
- **Directional valve spool** — ground ±0.002 mm, land/chamber geometry to print.
- **Valve bore sleeve** — honed bore, matched to spool.
- **Proportional spool** — ground + lapped, null-edge tolerances.
- **Screw-in cartridge housing** — steel, O-ring + backup groove sets.
- **Cartridge valve body** — drilled cavity per cartridge standard.
- **Solenoid armature tube** — brass/304, thin wall.
- **Armature plunger** — ground, magnetic stainless.
- **Pilot piston** — aluminum/steel, seal grooves + land.
- **Quick exhaust valve body** — brass, large-flow internal porting.
- **Check valve poppet** — steel/PEEK, ground + lapped seat.
- **Shuttle valve seat pair** — matched lapped seats.
- **Flow control needle** — ground taper, knurled adjust end.
- **Throttle screw** — fine-metering point geometry.
- **Pressure gauge boss** — brass/316, back or bottom mount.
- **Pressure switch body** — brass, diaphragm pocket machined in.
- **Multi-station manifold** — 3/4/5 stations, cross-drilled, pressure tested.
- **SAE split flange half** — steel, code 61/62 geometry.
- **ORFS swivel nut** — steel, rolled thread, face-seal geometry.
- **Test point adapter** — hardened probe seat.
- **Accumulator valve parts** — popper + seat matched sets.
- **Gear pump side plate** — ground both faces, parallelism ≤0.003 mm.
- **Hydraulic hose ferrule** — machined collar, skive geometry.
- **Rotary union body** — stainless, dual-passage cross-drilled.
- **Rotary union spindle** — ground seal diameters, Ra 0.1 option.
- **Pneumatic gripper jaw** — aluminum/steel, tooth geometry milled.
- **FRL body insert** — brass, bowl-thread interface.
- **Vacuum venturi body** — aluminum/brass, smooth internal cone.

## 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

- [Hydraulic & pneumatic case study](https://www.sinbo-machining.com/case/hydraulic-pneumatic-parts/)
- [Hydraulic cylinder body](https://www.sinbo-machining.com/case/hydraulic-cylinder-body/)
- [Aluminum parts](https://www.sinbo-machining.com/products/materials/aluminum/)

**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