Precision Custom Aluminum Spacers Manufactured to Your Drawings
SpacerMFG manufactures custom precision aluminum spacers, sleeves, standoffs, and turned components tailored to your engineering drawings and material specifications.
From prototype batches to high-volume production runs, our multi-axis CNC turning centers and automated milling equipment produce components with tight concentricity, consistent wall thicknesses, and specified surface finishes.
±0.010 mm
Tight OD and ID tolerance capability
Dimensional control for alignment, clearance, and repeatable assembly performance.
0.5 mm
Minimum wall thickness
Thin-walled aluminum sleeves and spacers produced with controlled machining processes.
24 hours
Target quote turnaround
Engineering review and formal quotation following receipt of complete project details.
Engineering control
Technical Specifications & Manufacturing Limits
Maintaining tight control of outer diameter, inner diameter, and length helps prevent binding, misalignment, and structural play in final assemblies.
| Parameter | Standard Capability | Tight Tolerance Capability |
|---|---|---|
| Outer Diameter (OD) | 2.0 mm to 300.0 mm | ±0.010 mm |
| Inner Diameter (ID) | 1.0 mm to 280.0 mm | ±0.010 mm |
| Length / Height | 1.5 mm to 400.0 mm | ±0.015 mm |
| Wall Thickness | Down to 0.5 mm | ±0.020 mm |
| Concentricity / Runout | 0.025 mm TIR | 0.010 mm TIR |
| Perpendicularity | 0.030 mm | 0.012 mm |
| Surface Finish | Ra 1.6 µm as-machined | Ra 0.4 µm ground / polished |
Production platform
CNC Machining Capabilities for Aluminum Spacers
Dedicated CNC turning and milling lines support geometries ranging from simple round bushings to complex stepped profiles, with processes suited to prototypes and high-volume production.
Discuss Your DrawingCNC Turning & Swiss Machining
Automated turning centers provide fast cycle times and repeatability for cylindrical spacers and high-volume sleeve production.
- Swiss-type machining: High-aspect-ratio spacers, small-diameter sleeves under 20 mm OD, and thin-walled parts where deflection must be controlled.
- Multi-spindle lathes: Medium-to-large production runs with live tooling for cross-drilled holes and retaining ring grooves.
CNC Milling & Secondary Features
Milling operations add custom geometry when a spacer requires features beyond rotational symmetry.
- Counterbored and countersunk holes for flush fastener mounting.
- Wrench flats, hex profiles, and drive slots for installation tooling.
- Off-center lubrication channels, alignment pins, and weight-reduction pockets.
Designed around your assembly
Spacer Configurations & Types
Custom aluminum spacers are tailored to specific mechanical mounting standards and installation requirements.
Plain Round Spacers
Smooth ID and OD for bolt isolation and axial load absorption.
Stepped & Flanged
Retaining shoulders to locate bearings, shafts, or panels.
Threaded Spacers
Internal or external threads, including female/female and male/female configurations.
Hexagonal Standoffs
Flat exterior walls for wrench installation in confined enclosures.
Thin-Walled Sleeves
Lightweight protection sleeves and linear guide alignment components.
Material engineering
Aluminum Grade Selection Guide
Certified aluminum mill stock can be sourced to balance structural strength, weight savings, corrosion resistance, surface response, and unit cost.
Aluminum 6061-T6
Traits: Excellent machinability, good strength-to-weight ratio, high weldability, and strong anodizing response.
Best for: Structural spacers, mounting blocks, and general-purpose sleeves.
Aluminum 7075-T6
Traits: Very high strength, excellent fatigue resistance, and higher hardness.
Best for: Aerospace, high-stress robotics joints, racing assemblies, and defense applications.
Aluminum 2024-T3
Traits: High yield strength under cyclic loading with lower corrosion resistance than 6061, requiring protective coatings.
Best for: Precision tension sleeves, aircraft hardware, and dynamic machinery linkages.
Aluminum 6063
Traits: Smooth cosmetic surface response and excellent clear or color anodizing potential.
Best for: Electronics enclosures, decorative hardware, and optical instrument spacers.
Protection and identification
Surface Finishing & Post-Processing Options
Controlled secondary finishing helps protect aluminum components and meet functional or cosmetic requirements.
Anodizing
- Type II: Clear or color anodizing with a 5–25 µm oxide layer; available colors include black, blue, red, and gold.
- Type III hardcoat: A 25–50 µm dense oxide layer for increased surface hardness and wear resistance.
Conversion & Plating
- Chromate / Alodine: Corrosion-resistant protection while preserving electrical conductivity.
- Plating: Electroless nickel and zinc plating options for specified performance requirements.
Mechanical & Marking
- Bead blasting for uniform matte textures and polishing for high-luster surfaces.
- Laser marking for part numbers, lot codes, or custom QR codes.
Documented quality
Quality Assurance & Inspection Equipment
Every manufacturing batch is verified against 2D drawings in PDF or DWG format and 3D CAD models in STEP or IGES format.
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1
First Article Inspection
Full dimensional reporting before mass production starts.
-
2
In-Process SPC
Critical ID and OD tolerances monitored at set intervals.
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3
Final Visual & Thread Inspection
Go/No-Go gauge testing for all threaded aluminum spacers.
Metrology Tools Used
Coordinate Measuring Machines
Volumetric position and geometric tolerance checking.
Optical Measurement Systems
Non-contact inspection of thin-walled profiles and step heights.
Air Gauges & Micrometers
Accurate bore diameter readings down to 0.002 mm increments.
Built for demanding assemblies
Industry Applications
SpacerMFG supplies custom precision aluminum spacers to equipment manufacturers across multiple sectors.
Industrial Automation & Motion Control
Sensor offsets, motor mounting depths, and linear guide alignments.
Robotics Manufacturing
Lightweight 7075-T6 spacers for robotic arm joints, end-effectors, and chassis frames.
Electronics & Telecommunications
Anodized standoffs for PCB mounting, shielding isolation, and rack-mount server chassis.
Automotive & Specialty Mobility
Custom sleeves for suspension assemblies, steering brackets, and EV battery modules.
Medical Equipment
Passivated and anodized components for diagnostic hardware and imaging system frames.
Start your project
Streamline Your Custom Aluminum Spacer Procurement
Send your RFQ directly to the engineering team at SpacerMFG for fast turnaround, consistent manufacturing tolerances, and complete drawing compliance.
Submit Your Drawings
Upload 2D PDF drawings with tolerances and 3D CAD files in STEP or IGES format.
Specify Project Details
Include material grade, surface finish, quantity, and target delivery date.
Receive a Detailed Quote
Our engineering team reviews manufacturability and issues a formal quote within 24 hours.
Request an Engineering Review
Share your requirements and our team will help determine the right material, process, and finish.
Email: info@spacermfg.com
Manufacturing Facility:
Operating Hours: Monday – Saturday | 8:00 AM – 6:00 PM (UTC+8)