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C93600 High-Leaded Bronze Bushings
Heavy-Load Self-Lubricating Bushings for Industrial Applications
C93600 (High-Leaded Tin Bronze / Modified SAE 64) is a high-lead, self-lubricating cast bronze alloy engineered for heavy-load, low-speed, and dirty operating environments. With 11–14% lead, it provides exceptional boundary lubrication, wear resistance, and maintenance-free operation, outperforming lower-lead bronzes in industrial applications. Available with or without graphite plugs, C93600 ensures long service life under challenging conditions.
C93600 belongs to CuPb5Sn, and is equivalent to other international grades such as CAC602, LBC2, ZCuSn10Pb5, and ZCuSnPb5Zn5, all sharing similar high-lead self-lubricating properties for heavy-load applications.
1. Material Selection Comparison – Why Choose C93600?
| Property / Feature | C93600 (High-Leaded Bronze) | C93200 (Gunmetal Bronze) | C92200 (Leaded Tin Bronze) |
|---|---|---|---|
| Lead Content | 11–14% (very high) | 6–8% | 1–2% |
| Self-Lubrication | Excellent | Very good | Good |
| Load Capacity | High | Moderate | Medium |
| Dirt/Debris Tolerance | Excellent | Good | Moderate |
| Machinability | Excellent | Good | Good |
| Graphite Option | Yes | Yes | Yes |
| Best For | Heavy-load, low-speed bushings | General bushings | Pumps & valves |
✔ Summary:
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C93600: Optimal for heavy loads, dirty conditions, and lubrication interruptions.
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C93200: Suitable for general industrial bushings.
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C92200: Ideal for corrosion-resistant sliding components.
2. Technical Highlights of C93600
| Category | Specifications |
|---|---|
| Chemical Composition (ASTM B505) | Cu: 80–85% Pb: 11–14% (solid lubricant) Sn: 7–9% (strength) Zn: 3–5% Trace Elements: Fe, Ni, Sb |
| Mechanical Properties | Tensile Strength: 200–250 MPa Hardness: HB 60–80 Elongation: 10–15% Machinability Rating: 80% |
| Performance Advantages | High self-lubrication, debris tolerance, corrosion resistance, heavy-load & low-speed stability |
| Available Forms | ✓ Continuous cast bushings ✓ Centrifugal cast bushings ✓ Graphite-plug bushings ✓ Solid bronze bushings (without graphite) |
3. Common Failures & Solutions
| Failure Type | Symptoms | Cause | Solution |
|---|---|---|---|
| Lubrication Breakdown | Noise, heat, scoring | Oil starvation under heavy load | Use graphite-plug bushings, reduce shaft roughness (Ra < 0.8 µm), expand lubrication grooves |
| Abrasive Wear | Uneven wear, embedded debris | Dusty/contaminated environment | Use high-lead C93600, install seals/dust rings, increase wall thickness |
| Misalignment Fatigue | One-sided wear, oval deformation | Housing tolerance issues | Apply H7/H8 fit, use continuous-cast bushings, consider graphite plugs |
| Surface Pitting/Corrosion | Pitting in water/chemicals | Corrosive exposure | C93600 resists corrosion; graphite plugs enhance lubrication; thicker walls for chemical isolation |
4. Customer Case Studies
Case 1 – Steel Mill Rollers
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Problem: Shaft bushings failed weekly under dust & heavy load.
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Solution: Graphite-plug C93600 bushings.
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Result: 40% longer service life; zero lubrication-related shutdowns.
Case 2 – Industrial Pump Manufacturer
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Problem: Boundary lubrication failures caused seizure.
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Solution: Solid cast C93600 bushings with oil grooves.
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Result: 32% friction reduction; improved high-temperature reliability.
Case 3 – Heavy Machinery OEM
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Problem: Shock loads deformed lower-lead bronzes.
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Solution: Centrifugal cast C93600 bushings.
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Result: Maintenance interval extended from 3 → 9 months; improved load capacity.
5. FAQ – Fast Technical Answers
Q1: Is C93600 suitable for heavy-load applications?
A: Yes, high lead content and compressive strength make it ideal for heavy-load, low-speed environments.
Q2: Should I choose graphite-plugged or non-graphite bushings?
A: Graphite → maintenance-free or intermittent lubrication; Non-graphite → systems with consistent lubrication.
Q3: Can C93600 replace C93200 or C92200?
A: Yes—especially for higher loads, unreliable lubrication, or severe contamination.
Q4: What casting method is best?
A: Continuous cast → dimensional stability; Centrifugal cast → large diameters, uniform structure.
6. Why Choose Our C93600 Bushings?
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Expert manufacturing: continuous, centrifugal, and graphite-plug forms
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Strict chemical control per ASTM B505
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OEM-level tolerances and technical support
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Available for bulk industrial supply
C93600 high-leaded bushings provide self-lubrication, corrosion resistance, and heavy-load performance, optimized for industrial OEMs seeking low-maintenance, long-lasting solutions.
