C91100 Bronze Bushing
C91100 Bronze Bushing
Self-lubricating bronze bearings are engineered for applications where external lubrication is impractical. Solid lubricants are compressed and molded directly into the bearing to guarantee a maintenance-free product. No additional lubrication is necessary.
Self-Lubricating C91100 Bronze Bushings for Heavy-Duty Applications
In the world of heavy industry—steel mills, mining, and heavy construction—conventional lubrication is often the first point of failure. Grease carbonizes under high heat, gets contaminated by abrasive dust, or simply cannot be pumped into bearings that are constantly moving under massive loads.
When lubrication fails, equipment stops. Downtime costs money.
The solution isn’t just “more grease.” The solution is changing the tribological system entirely. Enter the C91100 Bronze Bushing with Solid Lubricant (Graphite Plugs). By combining a High Leaded Tin Bronze matrix with embedded graphite, we create a bearing capable of surviving where standard oil-lubricated bearings fail.
As a specialized manufacturer, BronzeOilless.com is dedicated to engineering these custom solutions to keep your machinery running.
The Logic of Selection: Why Choose C91100 Graphite Plugged Bearings?
To understand the value of this material, we must look at the specific engineering challenges it solves. We don’t just sell a product; we solve a pain point.
Problem vs. Solution Matrix
| The Pain Point (Challenge) | The C91100 Solution | The Engineering Benefit |
| Lubrication Failure: High temperatures evaporate oil; dust turns grease into grinding paste. | Solid Lubrication (Graphite): Graphite plugs embedded in the bronze transfer a solid film to the shaft. | Maintenance-Free: achieves true “Oilless” operation. No seizing, even when external lubrication is cut off. |
| Edge Loading & Misalignment: Shaft deflection or structural vibration causes edge pressure. | High Leaded Matrix: The high lead content (13-16%) makes the alloy “forgiving” and conformable. | Anti-Seizing: The bearing adjusts slightly to the shaft geometry, preventing catastrophic locking or scoring. |
| Extreme Temperatures: Operating environments exceeding 200°C (400°F). | Thermal Stability: Bronze retains structure, and Graphite actually lubricates better as heat rises. | Reliability: Performance remains consistent in steel ladles, furnace conveyors, and drying ovens. |
| Heavy, Low-Speed Loads: High static pressure squeezes out liquid oil films. | Load Support: The Tin-Bronze structure supports high PSI, while the solid lubricant prevents metal-to-metal contact. | Wear Resistance: Extends the lifespan of toggle joints and pivot points significantly. |
Deep Dive: Material Specifications and Technical Comparison
Not all bronzes are created equal. Choosing the wrong alloy can lead to shaft damage or premature wear. Below, we compare C91100 against other common industry standards to help you make the right engineering decision.
C91100 Chemical Composition (Typical)
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Tin (Sn): 6.0 – 8.0% (Provides strength and hardness)
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Lead (Pb): 13.0 – 16.5% (Provides lubricity and machinability)
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Copper (Cu): Balance
Alloy Comparison Table
| Feature | C91100 (High Leaded Tin Bronze) | C93200 (SAE 660 / RG7) | C95400 (Aluminum Bronze) |
| Primary Attribute | Anti-Seizing & Conformability | General Purpose / Balanced | Extreme Tensile Strength |
| Lubricity | Excellent (High Lead content) | Good | Low (Requires constant grease) |
| Hardness (HB) | 60 – 80 | 65 – 80 | 170 – 210 |
| Shaft Protection | Best (Soft, won’t score shaft) | Good | Poor (Requires hardened shaft) |
| Ideal Application | High load, slow speed, dirty/poor lubrication | General machinery, medium speed | Heavy static loads, clean environments |
The Verdict:
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Choose C95400 if you have a hardened shaft and massive static loads, but can guarantee constant grease.
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Choose C93200 (SAE 660) for general repairs.
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Choose C91100 (High Leaded) when you need the ultimate insurance policy against friction, seizing, and lubrication failure in harsh environments.
International Standards Equivalent Cross-Reference
At BronzeOilless.com, we manufacture to global standards. While C91100 is a specific designation, it is often chemically and mechanically similar to the following international grades. We can manufacture based on any of these specifications.
| Standard | Designation | Notes |
| UNS / ASTM | C91100 | High Leaded Tin Bronze |
| SAE (USA) | SAE 64 / SAE 660 (Approx.) | Note: SAE 660 is technically C93200, but often used as a general category reference. |
| EN (European) | CuSn7Pb15 / CuSn7Pb20 | The closest direct European chemical equivalent. |
| DIN (German) | CC483K | Standard for leaded bronze bearing applications. |
| GB (China) | ZCuSn7Pb15 | The direct manufacturing standard used in high-quality Chinese foundries. |
| ISO | CuSn7Pb15 | ISO International standard. |
Typical Applications for C91100 bronze bushing
Where will you find C91100 Graphite Plugged Bushings performing best?
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Mining Machinery: Pivot points on crushers, excavators, and conveyer rollers where dust ingress is unavoidable.
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Steel Industry: Hot rolling mills, furnace doors, and cooling beds where heat destroys oil.
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Marine Engineering: Stern tubes and rudder bushings (the high lead content offers good corrosion resistance).
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Injection Molding: Toggle bushings and guide rails (Oilless operation prevents product contamination).
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Hydraulics: Guide bushings for heavy-duty hydraulic cylinders.
Why Partner with BronzeOilless.com?
We are not just a warehouse; we are a precision manufacturer. Here is why global OEMs trust us with their critical components:
1. Advanced Solid Lubricant Integration
We don’t just drill holes. We calculate the optimal surface area coverage (typically 25-30%) for the graphite plugs based on your motion type (reciprocating, rotating, or oscillating) to ensure a uniform lubrication film. We can also customize the plug material (e.g., MoS2 + Graphite) for vacuum or chemical environments.
2. Large-Scale Manufacturing Capabilities
Do you need a bushing with a 10mm ID or a 1000mm+ ID? Our facility is equipped with heavy-duty CNC Vertical Lathes and Deep Hole Boring machines. We specialize in large-diameter, heavy-wall copper bushings for the mining and marine sectors.
3. Build-to-Print Precision
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Custom Grooves: Oil grooves, dust grooves, or specific graphite patterns.
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Tight Tolerances: We machine to J6, H7, or m6 tolerances as required by your technical drawings.
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Material Certification: Every shipment includes a material analysis report verifying the Sn and Pb content.
Ready to Solve Your Bearing Challenges?
Don’t let bearing wear slow down your production. Switch to the reliability of C91100 Solid Bronze with Solid Lubricant.
Whether you have a completed CAD drawing or just a sample that needs reverse engineering, our team is ready to assist.
Contact Us for an Instant Quote:
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Email: una@viiplus.com
BronzeOilless.com – Your Global Partner for High-Performance Self-Lubricating Solutions.
