Precision Machined Bearing Steel Sleeves
SleeveMFG specializes in manufacturing custom bearing steel sleeves for industrial applications requiring extreme hardness, superior wear resistance, and micron-level dimensional stability. Sourced and machined directly to your print from our facility in Dongguan.
Material Advantage: Why Specify Bearing Steel?
Bearing steel—most commonly 52100 (AISI) or GCr15 (GB)—is selected for components operating under sustained mechanical fatigue, friction, and high radial or axial loads. We procure fully certified raw material with controlled chemical purity to guarantee operational integrity.
High Hardness
Reaches 58–64 HRC through controlled hardening cycles, resisting deformation under extreme localized point and contact stress.
Wear Resistance
Provides long service life in abrasive friction zones including dynamic seal journals, spacer seats, and continuous rotating assemblies.
Dimensional Stability
Maintains sub-micron structural stability when exposed to operational temperature variations and persistent mechanical loads.
Fatigue Strength
Engineered to counteract rolling contact fatigue (RCF) where sleeves interface with bearing elements, shaft journals, and raceways.
Precision Machining Capabilities
Machining bearing-grade alloys requires purpose-built rigid machine tools, tailored cutting geometries, and dedicated grinding equipment. SleeveMFG executes multi-stage pre- and post-hardening operations to meet precise print requirements.
CNC Turning
Raw bar stock and forged rings are turned to near-net shapes with controlled stock allowance reserved for final post-heat-treat grinding.
OD/ID Grinding
Cylindrical external and internal grinding achieving diameter tolerances down to ±0.005 mm on hardened bearing surfaces.
Precision Boring
Internal fit machining adhering to H6 and H7 tolerance classes to ensure concentric fitment on shafts and inside housing assemblies.
Secondary Geometry
Precise execution of internal oil distribution grooves, snap-ring retention grooves, radial cross-holes, and driving keyways.
Manufacturing Tolerances and Geometric Control
High-load rotating systems depend on exact form accuracy. Our quality control processes uphold strict geometric limits across single-part prototypes and multi-thousand volume production runs.
| Parameter | Capability |
|---|---|
| Outside Diameter (OD) | Ø3 mm – Ø500 mm |
| Inside Diameter (ID) | Ø1 mm – Ø450 mm |
| Concentricity | Down to 0.01 mm |
| Roundness | Down to 0.005 mm |
| Cylindricity | Down to 0.01 mm |
| Surface Finish | Down to Ra 0.2 μm |
Heat Treatment and Surface Finishing
Metallurgical control defines the operational capability of bearing sleeves. We configure specialized heat cycles and surface treatments to match mechanical stress and environmental exposure.
Through Hardening
Uniform hardness throughout the entire component body, maximizing total compressive load-bearing capacity.
Induction Hardening
Hardens designated outer or inner contact surfaces while keeping a ductile core to absorb heavy shock loading.
Tempering
Precise post-quench thermal cycles designed to relieve internal stresses, stabilizing geometry and preventing micro-cracking.
Surface Finishing
Application of black oxide, manganese phosphating, or dry-film lubricants to enhance anti-galling and rust resistance.
Typical Industrial Applications
Engineered for mission-critical assemblies across OEM production lines and MRO replacement systems where component failure causes costly operational downtime:
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Rotating Equipment: Pump shaft sleeves, mechanical seal sleeves, and precision spacer rings in dynamic pump systems.
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Power Transmission: Direct-fit inner and outer races, bearing cartridge sleeves, and industrial gearbox adapter collars.
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Heavy Machinery: Hardened wear sleeves for excavation, drilling, and mining systems exposed to heavy abrasive ingress.
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Industrial Automation: High-frequency linear guide sleeves, robotic arm pivot collars, and precision cam follower bushings.
Quality Assurance & Verification
Full metallurgical and dimensional traceability. Every production batch is certified against your CAD models and drawing tolerances with documented inspection data:
CMM Inspection
Positional geometry, runout, and multi-axis concentricity checking.
Optical Profile Projectors
Verification of snap-ring recesses, external chamfers, and edge profiles.
Surface Roughness Meters
Testing ground seal and fit diameters down to Ra 0.2 μm limits.
Rockwell Hardness Testers
Validation of uniform HRC depth across raw and finish-ground surfaces.
Material Test Reports (MTRs) and dimensional inspection sheets are included with every delivery.
Request a Custom Quote
SleeveMFG provides custom-manufactured bearing steel sleeves according to your CAD drawings or technical specifications. From rapid prototypes to repeat production batches, our Dongguan engineering team delivers made-to-print components.
Recommended RFQ Information:
- Material specification (e.g., 52100, GCr15)
- Required production quantity
- Critical tolerance dimensions & surface finish targets
- Heat treatment parameters (surface or core HRC)
SleeveMFG
Email: info@sleevemfg.com