Get answers to your questions about self-lubricating bearings with our informative FAQs on this reliable bearing technology.
FAQ Guide: Everything You Need to Know About Bronze Bushings & Bearings
Quick Answer: Why use Bronze for Bushings? Bronze is an industry-leading bearing material due to its sacrificial nature (protecting the shaft), excellent load-carrying capacity, and superior thermal conductivity (58-59 W/m·K). Whether you are using general-purpose bronze bushings or high-wear C93200 SAE 660 alloy, bronze provides a reliable, anti-seizure interface for industrial machinery.
1. Is bronze a good bearing material for heavy-duty applications?
Yes. Bronze is highly regarded for its exceptional combination of wear resistance and ductility. Unlike steel-on-steel contact, bronze acts as a sacrificial layer that absorbs wear to protect expensive rotating shafts.
Key Advantage: It has excellent embeddability, meaning it can trap tiny abrasive particles (dirt/grit) into its surface to prevent them from scratching the shaft.
High Load: High-quality bronze bushings can handle significant static and dynamic loads without deforming.
2. What makes C93200 (SAE 660) the standard for industrial bushings?
C93200 Bronze (SAE 660) is the most widely used “general-purpose” bearing bronze. It is favored by engineers for:
Optimal Machinability: With a rating of 70, it allows for high-precision dimensions and complex oil groove designs.
Anti-Friction Properties: The lead content in C93200 provides a low coefficient of friction, reducing heat buildup.
Durability: It offers excellent resistance to brine and sea water, making it suitable for a vast range of industrial and marine environments.
3. How do bronze bushings compare to steel or brass?
Choosing the right material is critical for the lifespan of your equipment:
Feature
Bronze (C93200)
Brass (C36000)
Steel (52100)
Friction Coeff.
Low (0.05-0.12)
Moderate
High (without balls)
Shaft Protection
Excellent (Sacrificial)
Moderate
Poor (May damage shaft)
Corrosion Resistance
High
Moderate
Low
Best Application
Heavy Industrial/High-Load
Light Duty/Electrical
High-Speed Precision
4. Do bronze bushings require constant lubrication?
While standard C93200 bushings require periodic oil or grease to maintain a hydrodynamic film, there are two specialized solutions:
Oil Grooves: Machining “Figure-8” or “Double Loop” grooves into the bushing helps distribute lubricant evenly across the pressure zone.
Self-Lubrication: For maintenance-free operation, we offer graphite-embedded bronze, which provides solid lubrication in high-temperature (up to 400°C) or hard-to-reach areas.
5. What factors should I consider when ordering custom bronze bushings?
To ensure the best performance, you should evaluate the PV (Pressure x Velocity) limit of your application:
Operating Load: Ensure the alloy (like C93200) can handle the specific MPa of your machine.
Environment: Consider Aluminum Bronze for extreme corrosion or Phosphor Bronze for high-frequency oscillation.
Shaft Hardness: For high-strength bronze, we recommend a shaft hardness of HRC 40+ for optimal wear life.
Expert Engineering Support at BearingFace
Still not sure which material fits your project? Our team at BearingFace specializes in high-performance bronze bushings and custom machining services.
👉 Contact Our Engineers Today for a PV Calculation or Custom Quote!
A self-lubricating bearing is defined by where its lubricant resides — inside the structure, not supplied from outside. That one property is not a single material but three mechanisms, and it is why selection runs on the PV value and why "can I oil it?" has three different answers by lining.
