Cast Bronze Bushings & Machined Bearings
Custom machined solid bronze bearings in C93200, C95400, and specialty alloys. Centrifugal casting for superior density. Custom oil grooves and precision tolerances.
Need self-lubricating properties without oil or grease? Check our Graphite Plugged Bronze Bushings page.
Premium Cast Bronze Bearing Solutions
JBM cast bronze bushings are manufactured from US Mill and EN certified bronze bar stock, precision machined to exact specifications. Our bearings are designed for medium to heavy loads, impact resistance, and elevated temperatures where conventional bearings fail.
Unlike self-lubricating bearings, cast bronze bushings require periodic oil or grease lubrication but offer superior load capacity, machinability, and repairability. They remain the gold standard for heavy machinery, construction equipment, and industrial applications worldwide.
Every JBM bronze bushing undergoes rigorous quality inspection including dimensional verification, hardness testing, and material certification traceability.
JBM Manufacturing Capabilities
- Custom Alloys: C93200, C95400, C86300, and specialty grades available
- Precision Machining: CNC turning, boring, and groove cutting
- Size Range: ID from 10mm to 800mm+ (custom sizes available)
- Oil Grooves: Figure 8, Double Loop, Straight, Circular patterns
- Certifications: Material test reports (MTR) provided with every order
Why Cast Bronze?
CNC Machining Services
Beyond standard bushings, JBM offers custom machined bronze parts including flanged bearings, thrust washers, wear plates, and complex geometries. Send us your drawings for a quote.
Request Custom Machining →Bronze Alloy Grades
JBM stocks and machines a comprehensive range of bearing bronze alloys. Select the right material for your load, speed, and environment requirements. Custom alloys available upon request.
| Alloy Family | Common Grades | Characteristics | Typical Applications |
|---|---|---|---|
| Leaded Tin Bronze Industry Standard | C93200 (SAE 660)RG7, CuSn7Pb7 |
| General machinery, pumps, valves, moderate loads |
| Tin Bronze High Wear | C90300, C90500CuSn10, CuSn12 |
| Marine, food processing, water/wastewater equipment |
| Aluminum Bronze Heavy Duty | C95400, C95800CuAl10Ni5Fe4 |
| Heavy equipment, marine, offshore, mining machinery |
| Manganese Bronze Extra Strength | C86300 (SAE 430B)C86500 |
| Bridge bearings, heavy presses, static load applications |
Custom Lubrication Groove Patterns
Proper oil distribution is critical for bearing longevity. JBM CNC machines precision oil grooves tailored to your specific lubrication requirements and shaft orientation.
Figure 8 Groove
Classic dual-loop pattern providing excellent oil distribution for rotating shafts. Industry standard for general-purpose bushings.
Best For: Continuous rotation, pumps, motors
Double Loop
Horizontal dual-loop design for wider coverage area. Ideal for longer bushings requiring extended lubrication paths.
Best For: Long bushings, heavy machinery
Straight / Axial Grooves
Multiple parallel grooves running axially along the bearing. Allows rapid oil flow and debris evacuation.
Best For: Dirty environments, oscillating motion
Circular / Circumferential
Ring grooves around the inner diameter for uniform oil distribution. Often combined with oil holes.
Best For: High-speed rotation, oil bath systems
Spiral Groove
Helical pattern that actively pumps lubricant along the bearing length during shaft rotation.
Best For: Unidirectional rotation, screw drives
Diamond / Cross Pattern
Intersecting groove pattern creating multiple oil reservoirs. Maximum lubrication coverage.
Best For: Heavy loads, intermittent operation
All groove patterns are CNC machined to precise specifications. Custom groove designs available. Provide your drawing or consult our engineers for optimal lubrication path recommendations.
Casting Methods & Quality Assurance
Centrifugal Casting
JBM utilizes centrifugal casting for superior material density and structural integrity. The centrifugal force during casting eliminates blowholes and porosity common in sand casting, producing a denser, more uniform microstructure.
- Denser material structure (no porosity)
- Superior mechanical properties
- Consistent wall thickness
- Cleaner surface finish
- Ideal for cylindrical shapes
Continuous Casting
For high-volume production of standard bar stock, continuous casting provides excellent cost efficiency while maintaining consistent material quality throughout long production runs.
- Cost-effective for large quantities
- Consistent material properties
- Wide range of standard sizes
- Excellent for bar and tube stock
Sand Casting
For extremely large or complex shapes that cannot be produced by other methods, sand casting provides the flexibility to create custom geometries and oversized components.
- Suitable for very large sizes (800mm+)
- Complex non-cylindrical shapes
- Low tooling costs for prototypes
- Custom one-off components
Why JBM Cast Bronze Bushings
Heavy Load Capacity
Solid bronze construction handles extreme static and dynamic loads. Aluminum bronze grades support loads exceeding 80 N/mm².
Excellent Machinability
Leaded bronze alloys (C93200) offer exceptional CNC machinability. Precise tolerances and smooth surface finishes achievable.
Impact Resistant
Solid metal construction absorbs shock loads and vibration. Ideal for heavy equipment where impact is unavoidable.
Corrosion Resistant
Bronze naturally resists corrosion. Aluminum bronze grades excel in seawater, marine, and chemically aggressive environments.
Temperature Tolerance
Cast bronze operates at elevated temperatures where plastics fail. Suitable for hot environments with proper lubrication.
Repairable & Rebabbitable
Unlike disposable polymer bearings, bronze bushings can be re-machined, rebored, or rebabbited to extend service life.
Material Traceability
Every JBM bushing ships with Material Test Reports (MTR) documenting chemical composition and mechanical properties.
Custom Sizes
From 10mm ID to 800mm+ ID, JBM machines bronze bushings to your exact specifications. Metric and imperial sizes available.
We typically respond to inquiries within 12 hours. Get expert recommendations for your application.
Get a QuoteTraditional Heavy Industry Applications
Cast bronze bushings remain the preferred choice for heavy machinery where load capacity, impact resistance, and repairability are paramount.
Construction Equipment
- Track roller bushings
- King pin bushings
- Bucket pin bushings
- Boom pivot bearings
- Steering knuckle bushings
- Dozer blade pivots
Mining & Crushers
- Cone crusher eccentric bushings
- Jaw crusher toggle bushings
- Gyratory crusher bearings
- Conveyor idler bushings
- Screen deck bearings
- Dragline bushings
Hydraulic Systems
- Cylinder rod end bushings
- Trunnion mount bearings
- Pump shaft bushings
- Valve stem bushings
- Actuator pivot bearings
- Piston rod guides
Marine & Industrial
- Rudder stock bearings
- Stern tube bushings
- Rolling mill chock liners
- Press slide gibs
- Crane boom bushings
- Paper mill roll bearings
Bushing Types & Geometries
Cylindrical Bushings
Standard sleeve bushings for shaft support. Press-fit or slip-fit installation.
ID: 10mm - 500mm+
Flanged Bushings
Integral flange provides axial thrust surface and locating feature.
ID: 10mm - 300mm+
Thrust Washers
Flat ring bearings for axial loads. Single or double thrust configurations.
OD: 20mm - 400mm+
Wear Plates
Flat bronze plates for sliding surfaces. Custom shapes and thicknesses.
Thickness: 5mm - 50mm+
Split Bushings
Two-piece design for installation without shaft disassembly.
ID: 50mm - 800mm+
Custom Shapes
Machined to your drawing. Complex geometries, multiple features.
Per your specifications
Need Custom Cast Bronze Bushings?
JBM specializes in precision machined bronze bearings for heavy industry. From single prototypes to production quantities, our CNC machining capabilities and material expertise deliver exactly what you need.
Request a Quote