Non-Magnetic Alloy Support Shaft Inner Sleeve WC-Ni Bearing Bushing for Centrifuges & Pumps
Product Overview: The Load-Bearing Core of Rotating Assemblies
In high-speed rotating equipment—centrifugal separation systems, mixers, agitators, pumps and decanters—the interface between the rotating support shaft and the stationary housing defines equipment reliability. This is where the support shaft inner sleeve functions: a precision cylindrical component mounted inside the shaft bore or housing, designed to absorb radial and axial loads, maintain alignment, and protect both the shaft and the assembly from wear.
When this critical load zone operates in magnetic-sensitive environments—semiconductor wafer processing, MRI-adjacent medical devices, or high-purity pharmaceutical mixing—standard steel sleeves present unacceptable risks: magnetic attraction that contaminates products and ferrous particle generation that threatens batch integrity.
Our Precision Non-Magnetic Alloy Support Shaft Inner Sleeves are engineered specifically for these demanding conditions. Manufactured from advanced WC-Ni (Tungsten Carbide-Nickel) alloy, these inner sleeves deliver the essential combination of load-bearing capacity, absolute magnetic neutrality, and exceptional wear resistance for applications where other materials cannot be tolerated.
Technical Specifications
| Parameter |
Standard Capability |
High-Precision Option |
| Material Grades |
WC-Ni (YN6, YN8, YN13+) |
WC-Ni-Cr for enhanced corrosion resistance |
| Hardness |
89-92 HRA |
Consistent throughout |
| Magnetic Permeability |
< 1.002 batch-certified |
< 1.001 achievable |
| Working Temperature |
Up to 800°C |
Material-dependent |
| Special Features |
Lubrication grooves, flanges, stepped IDs, axial slots, oil pockets, mounting holes |
Per customer drawing |
Distinct Functions: Differentiating from Similar Components
| Component |
Function |
Our Differentiation |
| Support Shaft Inner Sleeve |
Load-bearing interface: Mounted inside the shaft bore, designed to support radial loads, maintain shaft alignment, and protect rotating/stationary interfaces in pump or centrifuge assemblies |
Load-focused non-magnetic material—optimized for radial and axial load resistance, not just low friction |
| Guide Bushing |
Low-friction guide for axial/rotary motion (e.g., ejector pins, linear slides) |
Previous client product—different functional focus |
| Outer Diameter Ring |
OD-defined positioning, bearing race or spacer |
Previous client product—external fit focus |
| Vacuum Seal |
Leak prevention in high-vacuum conditions |
Previous client product—sealing focus |
The inner sleeve is distinguished by its load-supporting mission—primarily selected for its compressive strength and wear resistance to protect the shaft-housing interface over millions of operating cycles.
Referred to as: bearing sleeve, support bushing, inner bearing bush, pump shaft bushing, or rotating support sleeve.
Performance Comparison: Why WC-Ni Surpasses Standard Options
| Property |
Our WC-Ni Support Shaft Inner Sleeve |
Standard Stainless Steel Sleeve (316/304) |
Standard WC-Co Bushing |
| Magnetic Permeability |
< 1.002 (Non-Magnetic) |
1.02-1.05 (Slightly Magnetic) |
1.5-2.0 (Magnetic) |
| Hardness |
89-92 HRA |
~70-90 HRB |
89-92 HRA |
| Wear Life vs. Steel |
10-50× longer |
1× baseline |
Exceptional |
| Load Capacity |
High (compressive >4,000 MPa) |
Moderate |
Very High |
| Corrosion Resistance |
Excellent (Ni binder) |
Good (marine grade) |
Moderate (Co susceptible to acids) |
| Maximum Operating Temp. |
~800°C |
~425°C |
~800°C |
| Ideal Application |
Chemical pumps, decanters, high-purity mixing |
General purpose |
General wear, not for magnetic-sensitive applications |
Key Applications & Industries
Support shaft inner sleeves are critical components in rotating equipment where the shaft must be supported within a stationary housing:
Industrial Centrifugal Separation
- Scroll centrifuge support bearings
- Decanter conveyor shaft sleeves
- Solid-bowl centrifuge inner bushings
Process Pumps
- Chemical transfer pump shaft supports
- Slurry pump bearing sleeves
- Cryogenic pump inner bushings
Mixing and Agitation Systems
- High-shear mixer shaft sleeves
- Agitator inner bearings
- Homogenizer support bushings
Pharmaceutical & Bioprocessing
- Clean-in-place (CIP) mixer shaft sleeves
- High-purity bioreactor agitator supports
- Sanitary pump inner bushings
Food & Beverage Processing
- Stainless steel pump shaft sleeves
- Hygienic mixer support bushings
- CIP-compatible rotating interfaces
Semiconductor & Precision Manufacturing
- Wafer handling robot shaft supports
- Chemical-mechanical planarization (CMP) pump bushings
- High-purity chemical delivery pump sleeves
Customization Capabilities
Support shaft inner sleeves are application-specific components. We specialize in made-to-order manufacturing based on your requirements:
| Customization Parameter |
Options |
| Dimensions |
ID, OD, length per customer drawing |
| Fit Types |
Press fit, slip fit, transition fit clearance |
| Material Grade |
YN6, YN8, YN13, WC-Ni-Cr, fine grain |
| Surface Features |
Lubrication grooves (spiral, axial, cross-hatch), oil pockets, grease retention dimples |
| Mounting Features |
Flanges, stepped ODs, keyways, threaded IDs, mounting holes |
| Special Features |
Split sleeve designs, axial ports, sensor slots |
| Quantity |
Single prototype to high-volume production |
Contact us today for a technical consultation or a customized quotation.
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