Custom Precision Shaft Spacers
Precision-turned and milled shaft spacers engineered to exact print specifications for severe mechanical duty, high-speed rotary assemblies, and critical axial positioning.
SpacerMFG has operated from Shenzhen, China since 2013, producing custom components in alloy steel, stainless steel, aluminum, brass, bronze, and engineering plastics.
±0.005 mm
Tight tolerance capability
24 hrs
Typical quote turnaround
Engineering function
Axial control for demanding assemblies
Precision shaft spacers maintain exact axial distance between bearings, gears, sprockets, pulleys, and structural housings along a rotating or stationary shaft. Unlike standard washers or commercial shim stock, they are designed to sustain radial dynamics, thrust loads, and tight assembly tolerances.
Face parallelism
Distributes dynamic thrust loads evenly across bearing races to help prevent micro-misalignment, shaft binding, and premature bearing failure.
Bore concentricity
Reduces imbalance and vibration in high-RPM motor drives, gearboxes, and other rotary systems.
Surface integrity
Burr-free edges and controlled tool marks help protect mating shafts, seals, and operators during assembly.
CNC machining capabilities
Built around your drawing and production plan
Multi-axis CNC turning centers, Swiss-type automatic lathes, and vertical machining centers support components ranging from small instrument sizes to heavy industrial dimensions.
| Parameter | Operational specification |
|---|---|
| Inner diameter (ID) | Custom from 2.0 mm to 300 mm |
| Outer diameter (OD) | Custom from 4.0 mm to 400 mm |
| Length / width | Custom from 0.5 mm to 500 mm |
| Machining tolerances | Standard: ±0.02 mm; tight tolerance down to ±0.005 mm, drawing dependent |
| Face parallelism & flatness | Down to 0.005 mm |
| Concentricity, ID to OD | Down to 0.01 mm |
| Surface finish | Ra 0.8 µm to Ra 3.2 µm standard; finer finishes available via grinding |
| Production volumes | Fast-turn prototypes, low-volume pilot runs, and repeat production contracts |
Material selection
Choose the material around the duty cycle
Certified raw stock is available with material test reports to support mechanical, environmental, wear, and compliance requirements.
Stainless steel
304, 316L, 17-4 PH, 416
Corrosion resistance, tensile strength, and temperature stability.
Marine drives, food processing, medical equipment, outdoor actuators.
Aluminum
6061-T6, 7075-T6, 2024
Low mass density, high strength-to-weight ratio, and thermal conductivity.
Robotics, aerospace subassemblies, automated machinery, optical gear.
Carbon & alloy steel
1018, 1045, 4140, 8620
Fatigue resistance and compatibility with case hardening or induction treatment.
Power transmissions, automotive driveshafts, conveyor systems.
Brass & bronze
C36000, C93200 (SAE 660)
Low friction, non-magnetic properties, and natural galling resistance.
Bushing sleeves, thrust washers, marine hardware, spark-resistant fixtures.
Engineering plastics
POM, PEEK, PTFE
Electrical insulation, chemical inertness, and self-lubricating low friction.
Semiconductor handling, laboratory instruments, electrical switchgear.
Geometry and finishing
Beyond the standard cylindrical spacer
Secondary machining and finishing operations match complex interfaces and exact CAD files.
Keyways & splines
Internal or external slots for shaft locking and torque transmission.
Retaining ring grooves
Precision snap-ring or circlip grooves on ID or OD surfaces.
Stepped & flanged profiles
Integrated shoulders locate adjacent components without extra backing rings.
Cross-drilling & tapping
Radial grease ports, set-screw threads, and oil lubrication channels.
Split and clamping configurations
Slotted or split-collar geometries for non-marring shaft clamping.
Secondary operations
- 1
Raw machining
CNC turning, milling, and feature creation.
- 2
Edge deburring
Removal of burrs, sharp corners, and tool flash.
- 3
Surface treatment
Anodizing, passivation, plating, black oxide, or heat treatment.
- 4
Quality inspection
Dimensional and finish verification against requirements.
- 5
Packaging
Prepared for international shipment and production use.
Available finishes: Type II and Type III hardcoat anodizing, passivation, electroless nickel, zinc plating, cadmium-alternative coatings, black oxide, heat treatment, and laser marking.
Application fit
Designed for precise motion and load control
Industrial automation & motion control
Servo motor shafts, ball screw supports, and linear guide systems benefit from tight face parallelism that helps prevent axial binding and backlash under high dynamic cycles.
Robotics & drones
Weight-optimized aluminum and titanium shaft spacers support robotic arms, joint actuators, and gimbal drives where mass reduction improves payload responsiveness.
Heavy equipment & powertrains
Hardened steel spacers are used in planet carriers, transfer cases, and hydraulic pumps to absorb continuous axial thrust loads.
Electronics & precision instruments
Small-bore brass, stainless steel, and plastic spacers fit optical mounts, encoder shafts, and micro-actuators requiring zero burr residue.
Quality assurance
Verification from raw stock to dispatch
Every production lot undergoes quality control protocols with traceability from material receiving through final dispatch.
First-article inspection
Full dimensional check against print specifications before production begins.
In-process quality checks
Periodic sampling during CNC turning helps identify tool wear early.
Final dimensional verification
Bore gages, micrometers, air gages, surface plates, dial indicators, and CMM equipment verify bore, OD, parallelism, and flatness.
Surface and documentation control
Contact profilometers verify Ra requirements. Dimensional inspection reports, Certificates of Conformance, and Material Test Reports are available upon request.
Request a quote
Send your drawing for a manufacturability review
Share your shaft spacer requirements with the engineering team for competitive pricing, technical DFM feedback, and international shipping support.
What we need to quote your project
- CAD files / prints: PDF, STEP, STP, IGES, or DXF
- Material requirements: Grade, heat treatment, and finish specifications
- Quantities: Prototype, short-run, or annual production estimates
- Critical tolerances: Highlight dimensions requiring tight limits
Typical quote turnaround is within 24 hours. SpacerMFG provides technical feedback and international shipping to help keep your build schedule on track.
Start your RFQ
Provide your project details and the team will follow up with the next steps.
Email: info@spacermfg.com
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