C90800 Bronze Graphite Bushings
C90800 Bronze Graphite Bushings
C90800 Bronze Graphite Bushings – Tin CuSn12 Bronze
Oilless Half-Bushings: The Ultimate Guide for Maintenance-Free Performance in High-Load Applications
For engineers and procurement managers in demanding industrial sectors, selecting the right bearing is critical for equipment reliability and operational efficiency. When applications involve heavy loads, slow speeds, and harsh environments, traditional lubricated bearings often fall short. This is where C90800 bronze graphite oilless bushings excel, offering a robust, maintenance-free solution.
What are C90800 Bronze Graphite Oilless Half-Bushings?
C90800, also known as Tin Bronze CuSn12, is a high-strength copper alloy renowned for its exceptional wear and corrosion resistance. By strategically embedding solid graphite plugs into the C90800 bronze base, these bushings become self-lubricating.
How it Works: As the shaft rotates or moves, it makes contact with the graphite plugs. This interaction transfers a thin, solid lubricant film onto the shaft, creating a low-friction surface that eliminates the need for external grease or oil. The “half-bushing” or split design allows for easier installation and maintenance in applications where a full, solid bushing is impractical.
Key Benefits for Engineers & Procurement Professionals
Choosing C90800 graphite-plugged bushings translates directly to operational and financial advantages:
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Zero Maintenance: Eliminates the need for manual greasing schedules, reducing labor costs and human error.
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Increased Uptime: Self-lubricating design prevents costly downtime from bearing seizure or failure due to lubricant starvation.
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Superior Load Capacity: The high-strength C90800 bronze substrate withstands extreme static and dynamic loads without deformation.
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Exceptional Durability: Offers excellent resistance to wear, abrasion, and corrosion, ensuring a long service life even in harsh industrial environments.
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Wide Temperature Range: Performs reliably in temperatures where traditional greases would fail or carbonize.
Cusn12 bronze graphite bushings - C90800 tin bronze alloy
C90800 (CuSn12) vs. Standard Bronze Bushings: A Technical Comparison
| Feature | C90800 Graphite Bushing | Standard Bronze Bushing |
| Lubrication Method | Self-lubricating (solid graphite) | Requires external grease/oil |
| Maintenance | None required | Periodic re-lubrication |
| Max Load (Static) | Very High | High |
| Max Speed | Low to Medium | Low to High |
| Operating Temperature | -40°F to 572°F (-40°C to 300°C) | Dependent on lubricant type |
| Contamination Risk | Low (no liquid lubricant) | High (grease can attract debris) |
| Ideal Application | High load, low speed, intermittent motion | General purpose, moderate loads |
| Cost Efficiency | Higher initial cost, lower total cost of ownership (TCO) | Lower initial cost, higher maintenance costs |
Technical Specifications: C90800 (CuSn12) Bronze Alloy
Our C90800 bushings are manufactured in strict accordance with ASTM B505 standards, ensuring consistent material quality and performance.
Chemical Composition (ASTM B505/B505M)
| Element | Content (%) | Key Function |
| Copper (Cu) | 85.0 – 89.0 | Base metal providing strength and conductivity |
| Tin (Sn) | 11.0 – 13.0 | Key alloying element for hardness and wear resistance |
| Lead (Pb) | ≤ 0.25 | Improves machinability (low-lead formulation) |
| Zinc (Zn) | ≤ 0.25 | Enhances castability |
| Phosphorus (P) | ≤ 0.30 | Deoxidizer, improves fluidity during casting |
Mechanical & Physical Properties
| Property | Typical Value | Significance for Application |
| Tensile Strength | 241 – 310 MPa (35 – 45 ksi) | High resistance to pulling forces |
| Yield Strength | 117 – 152 MPa (17 – 22 ksi) | Resists permanent deformation under load |
| Brinell Hardness (HB) | 65 – 95 | Ensures durability and resistance to surface wear |
| Max PV Value (Dry) | 1 N/mm²·m/s | Excellent performance under pressure and velocity |
| Max Load Capacity | 50 MPa | Suitable for extreme load-bearing applications |
| Friction Coefficient | < 0.1 | Low friction for smooth, efficient operation |
Common Applications for C90800 Oilless Bushings
The unique properties of these bushings make them the ideal choice for a wide range of heavy-duty industries:
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Steel Manufacturing: Continuous casters, roller guides, and ladle cars.
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Mining & Quarrying: Pivot points on excavators, crushers, and heavy earth-moving equipment.
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Hydropower & Turbines: Wicket gate bushings, linkages, and valve components.
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Injection Molding: Mold slides, ejector pins, and toggle mechanisms.
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Heavy Construction: Crane booms, bridge expansion joints, and offshore equipment.
Frequently Asked Questions (FAQ)
Q1: How do oilless bronze bushings compare to traditional bearings?
A1: Oilless bronze bushings are superior in applications with high loads, low speeds, and difficult-to-lubricate areas. They eliminate the need for grease, reducing maintenance and contamination risk, which makes them more reliable in harsh conditions than many traditional roller or plain bearings.
Q2: Can I get C90800 bushings in custom sizes or configurations?
A2: Yes. At Bearingface, we specialize in providing custom-machined bushings, including flanged, grooved, and complex geometries to meet your specific design requirements. Contact our engineering team to discuss your project.
Q3: What is the expected service life of a C90800 graphite-plugged bushing?
A3: Service life is highly dependent on the specific application parameters (load, speed, temperature, and environment). However, due to their excellent wear resistance and self-lubricating properties, C90800 bushings typically offer a significantly longer lifespan than standard lubricated bearings in their intended applications, often exceeding 5 years with minimal wear.
Q4: Are these bushings suitable for underwater or marine environments?
A4: Absolutely. The high tin content in C90800 bronze provides excellent corrosion resistance, making these bushings ideal for marine, offshore, and other high-humidity or submerged applications.
Upgrade Your Machinery with C90800 Oilless Bushings
Stop dealing with the costs and downtime associated with bearing lubrication and failure. Upgrade to our high-performance C90800 Bronze Graphite Oilless Bushings for a reliable, long-lasting solution.
Ready to enhance your equipment’s performance? Contact our technical sales team today for a quote or to discuss your application needs.
