Motors & Power Transmission · Made-to-Print Machining
Precision Sleeves for Motor & Power Transmission Assemblies
In motor and power transmission systems, the performance of the entire assembly often relies on the precision of rotating components. SleeveMFG manufactures custom-machined sleeves and bushings designed to meet the rigorous dimensional, concentricity, and fit requirements of high-speed rotating equipment.
We operate as a made-to-print manufacturer, producing components directly from customer engineering drawings and 3D models — with specific focus on bore-to-OD concentricity and surface finish so our sleeves integrate seamlessly into motor shafts, gearboxes, and coupling assemblies.
- Grinding Tolerance
- ±0.005 mm
- Runout
- 0.01 mm
- Surface Finish
- Ra 0.2 μm
- OD Range
- Ø3–500 mm
Concentricity-critical machining
Bearing races · Seal seats · Spacers
01Engineering Requirements
Geometric Control for Rotating Equipment
Rotating equipment demands high levels of geometric control. When a sleeve serves as a bearing race, a seal seat, or a spacer within a motor, even minor deviations in roundness or cylindricity can lead to vibration, premature bearing failure, or seal leakage.
Our manufacturing process prioritizes the technical parameters that determine whether a sleeve performs over the full service life of your assembly.
Concentricity & Runout
Essential for high-speed motors to prevent imbalance and vibration.
Dimensional Fits
Adherence to standard ISO fits (e.g., H7/h6) to ensure proper interference or clearance during assembly.
Surface Finish
Controlled Ra values to optimize mechanical seal performance and reduce friction at bearing interfaces.
Wall Thickness Consistency
Preventing distortion in thin-walled sleeves during machining and heat treatment.
02Component Range
Components for Motor and Transmission Applications
SleeveMFG supplies precision components for a variety of power transmission and fluid handling systems. We do not manufacture standard catalog parts — we machine parts tailored to the unique design of your assembly.
Discuss your application with our engineers →Motor Shaft Sleeves
Precision-ground sleeves for shaft protection and bearing journals.
Bearing Sleeves
Spacers and housings machined to support precise bearing positioning.
Coupling Sleeves
High-strength sleeves designed to transmit torque while maintaining alignment.
Spacer Sleeves
Precision-length spacers for gearboxes and power transmission shafts to ensure correct axial spacing.
Seal Sleeves
Hardened and ground sleeves providing a wear-resistant surface for mechanical seals.
03Capabilities & Specifications
Manufacturing Capabilities & Technical Specifications
Our facility in Dongguan is equipped for the end-to-end production of precision sleeves. We combine CNC turning, grinding, and secondary operations to meet tight tolerance requirements that exceed standard machining capabilities.
We maintain a production environment that supports both prototype engineering and volume manufacturing, allowing for consistency across long-term supply agreements.
Check your tolerances against our limits| Parameter | Capability |
|---|---|
| Outside Diameter | Ø3 mm – Ø500 mm |
| Inside Diameter | Ø1 mm – Ø450 mm |
| CNC Turning Tolerance | ±0.01 mm |
| Precision Grinding Tolerance | ±0.005 mm |
| Concentricity / Runout | Down to 0.01 mm |
| Surface Finish | Down to Ra 0.2 μm |
| Length | 3 mm – 1500 mm |
| Wall Thickness | Down to 0.5 mm |
04Materials
Material Selection for High-Torque Environments
Power transmission components often operate under significant mechanical stress, requiring specific material properties. We machine a comprehensive range of materials suitable for these applications.
Stainless Steel
304 · 316L · 17-4PH · 15-5PH
Corrosion resistance for fluid handling or exposed environments.
Carbon & Alloy Steel
4140 · 42CrMo · 40Cr
For high-strength power transmission requirements.
Bearing & Tool Steel
52100 · GCr15 · D2
High hardness and wear resistance for demanding rotating contacts.
Copper Alloys
Bronze · Aluminum Bronze
Proven materials for bushings and sleeve bearings.
Nickel Alloys
Inconel · Monel
Specialized high-temperature or corrosive environments.
Need a specific grade?
We evaluate specialty materials against your application requirements.
05Secondary Operations
Secondary Operations and Surface Protection
Manufacturing rarely ends at the machine. To ensure long-term performance in motor and transmission environments, we coordinate essential secondary operations.
01
Heat Treatment
Quenching, tempering, and induction hardening to increase surface hardness and fatigue resistance.
02
Surface Coatings
Hard chrome plating, electroless nickel plating, and PVD/DLC coatings to improve wear resistance and reduce friction.
03
Precision Finishing
Centerless and cylindrical grinding to achieve final tolerances and surface finishes.
04
Stress Relieving
Post-machining treatments to ensure dimensional stability during operation.
06Who We Supply
Sourcing Solutions for OEMs and MROs
We support two primary customer segments within the motor and power transmission industry.
For OEMs
We provide stable, long-term manufacturing for consistent production runs.
- —Work performed directly from your 2D drawings and 3D models
- —Every batch meets the exact specifications required for your motor or gearbox assembly
- —Consistency maintained across long-term supply agreements
For MRO & Repair Providers
We manufacture custom replacement sleeves for discontinued or obsolete equipment.
- —Reverse-engineering from samples or critical dimensions
- —A working solution when original spare parts are unavailable
- —Prototype and small-batch quantities supported alongside volume orders
Get Started
Request a Quote for Your Project
SleeveMFG provides precision machining solutions for complex sleeve components. To receive a quotation, please send your technical drawings or 3D models, including material, quantity, and surface finish requirements.
We review all inquiries for manufacturability and provide competitive lead times for both prototype and production orders.
- info@sleevemfg.com
Send Your Drawings
Attach your 2D drawing or 3D model with material, quantity, and surface finish requirements. Our engineering team typically responds within one business day.