Custom Precision Machined Components for Pumps & Valves
SpacerMFG manufactures custom CNC-turned and milled precision spacers, sleeves, bushings, valve stems, and fluid-handling hardware directly from customer drawings.
Operating from our Shenzhen facility since 2013, we supply tight-tolerance metal and plastic components to OEMs, pump manufacturers, and industrial equipment builders worldwide.
±0.005 mm
Precision features on request
Since 2013
Shenzhen manufacturing base
Global OEM
Prototype to production supply
Engineering-led production
Submit 2D drawings or 3D CAD files for a fast manufacturing review and competitive pricing.
Dimensional accuracy
Built for demanding pump and valve assemblies
Fluid handling systems require high dimensional consistency. In centrifugal pumps, control valves, pressure regulators, and actuators, small variations in component geometry can cause leakage, pressure loss, vibration, or premature seal failure.
Maintains shaft alignment · Controls axial clearance · Helps prevent fluid leakage
Concentricity & runout
Pump shaft sleeves and bearing spacers can maintain runout within ±0.005 mm to help prevent shaft whip and mechanical seal misalignment.
Surface roughness
Valve stems, seal faces, and internal bores can be produced at Ra 0.4 µm or smoother to protect elastomer seals and packing materials.
Axial spacing
Precision spacers control impeller clearance and valve seat positioning for accurate flow rates and consistent shutoff under line pressure.
Component portfolio
Custom parts for fluid control systems
We build components from your engineering drawings, material specifications, and surface finishing callouts.
| Component type | Common materials | Key parameters & features | Typical applications |
|---|---|---|---|
| Pump shaft sleeves | 316L, 17-4PH, Duplex Steel | Precision ground OD/ID, keyways, seal grooves, Ra 0.4 µm | Centrifugal pumps, slurry pumps, chemical transfer |
| Precision spacers | 304/316 Stainless, Aluminum, Brass | Custom OD/ID, strict parallelism and length tolerances | Impeller positioning, motor mounts, valve body alignment |
| Valve seat bushings | Stainless Steel, Brass, PEEK | Tight bore tolerances, chamfered edges, fine threads | Needle valves, globe valves, pressure control units |
| Threaded standoffs & connectors | Stainless Steel, Carbon Steel | NPT, BSPP, metric internal/external threads, hex flats | Valve actuator linkages, instrument manifolds |
| Flanged sleeves | Stainless Steel, Aluminum | Multi-diameter step profiles, custom flange thickness | Hydraulic control valves, metering pump housings |
| Custom valve stems & shafts | 17-4PH, 316 Stainless Steel | Ground shafts, acme or fine threads, cross-drilled holes | Gate valves, butterfly valves, flow regulators |
From drawing to finished part
CNC machining capabilities for every production stage
Our shop floor handles low-volume prototyping, bridge production, and high-volume production schedules using customer-supplied CAD files and engineering drawings.
Finished component ← QC inspection ← Surface treatment
CNC turning
Diameters from 2.0 mm up to 300 mm and lengths up to 500 mm. Live tooling supports cross-drilling, keyways, and off-axis milling in one setup.
CNC milling
Work envelope up to 800 mm × 500 mm × 400 mm for valve bodies, manifold blocks, mounting brackets, and specialized hardware.
Tolerance control
Standard machining tolerances to ISO 2768-m, with precision features ground or turned to ±0.005 mm upon request.
Secondary operations
In-house precision drilling, reaming, tapping, deburring, cylindrical grinding, and surface polishing.
Material selection
Choose materials for pressure, chemistry, heat, and wear
The appropriate alloy or plastic depends on working pressure, chemical exposure, thermal range, and wear exposure.
Stainless steels
- 316 / 316L: Corrosion resistance for chemical pumps, marine environments, and food-grade valves.
- 17-4PH: High strength and wear resistance for pump shafts, valve stems, and wear rings.
- 304 / 304L: Cost-effective for industrial water pumps, pneumatic valve bodies, and spacers.
Non-ferrous alloys
- Brass & bronze: Low friction for shaft bushings, guide sleeves, and non-sparking components.
- 6061-T6 / 7075-T6: Lightweight options for pneumatic manifolds, actuator housings, and spacers.
- Copper: Useful where thermal or electrical conductivity is required.
Engineering plastics
- PTFE: Chemically inert for demanding valve and pump environments.
- PEEK: High-temperature and high-pressure performance for seats and bushings.
- POM / Delrin: Low-friction performance for wear washers and isolation components.
Surface finishing
Protective finishes that extend service life
Surface treatments protect raw materials from aggressive media, reduce friction, and improve field performance.
Passivation
ASTM A967 / A380 treatment removes free iron and enhances stainless steel corrosion resistance.
Electropolishing
Electropolishing and mechanical polishing can reduce roughness to Ra 0.2 µm for sanitary applications.
Anodizing
Type II and Type III hardcoat anodizing improves aluminum hardness, abrasion resistance, and dielectric properties.
Plating & oxide finishes
Electroless nickel, zinc plating, and black oxide protect carbon steel components in varied operating environments.
Quality assurance
Inspection at every critical production stage
SpacerMFG performs dimensional inspection throughout production to verify compliance with your drawing requirements.
- 01
Raw material verification
Material test reports and mill certificates are available upon request for traceability.
- 02
First-article inspection
Critical features, threads, and diameters are verified before production runs begin.
- 03
In-process checks
Calibrated gauges and micrometers check bores, steps, wall thicknesses, and surface finishes.
- 04
Final quality inspection
CMM, optical comparators, thread gauges, and surface roughness testers verify final compliance.
Application fit
Match project requirements to the right process
High-pressure hydraulic valves
Recommended: Turned 17-4PH or carbon steel with heat treatment.
High yield strength helps prevent bore deformation under pressure spikes.
Chemical processing pumps
Recommended: Turned 316L stainless steel with passivation.
Designed for acid and solvent resistance with minimal iron contamination.
Sanitary & food-grade valves
Recommended: Electropolished 316L stainless steel, Ra < 0.4 µm.
Smooth internal bores simplify cleaning and help prevent bacteria accumulation.
High-speed rotating shafts
Recommended: Precision-ground stainless sleeves with runout < 0.005 mm.
Supports dynamic balance and protects dynamic seals.
Pneumatic control systems
Recommended: Anodized aluminum spacers and standoffs.
A lightweight, economical option for volume assembly with tight dimensional control.
Request a quote
Send your pump or valve requirements to our engineering team
We welcome RFQs for low-volume prototypes, pre-production samples, and recurring production orders. Submit your component details for evaluation, pricing, and lead-time guidance.
Include these items in your RFQ
- 2D drawings: PDF, DWG, or DXF files showing tolerances, threads, finishes, and critical dimensions.
- 3D CAD models: STEP, STP, or IGES files for geometric and CAM analysis.
- Material and grade: Such as 316L stainless steel, Brass C36000, or PEEK.
- Surface treatment: Passivation, anodizing, plating, grinding, or polishing requirements.
- Order quantities: Prototype quantity and estimated annual volume.
Contact our engineering team
Send your engineering files directly to our sales and technical support desk. We review requests promptly and respond with detailed pricing and lead times.
Email:
info@spacermfg.com
Address:
Hours:
Monday – Saturday
8:00 AM – 6:00 PM (UTC+8)