Bearing Bushing Bronze Grades Chart, understanding the different bronze grades available for bearing & bushing applications.

Key Considerations When Selecting a Bronze Grade:

1. Load: Higher strength alloys (Aluminum Bronze, Manganese Bronze) are needed for heavy loads. Leaded bronzes handle moderate loads well.

2. Speed: Higher speeds often require better heat dissipation and anti-friction properties (leaded bronzes can excel here if loads are moderate). High strength alloys may need careful lubrication design at high speeds.

3. Wear Resistance: Tin, Aluminum, and Phosphorus generally increase wear resistance. Lead improves anti-seizure properties.

4. Machinability: Lead significantly improves machinability. Aluminum and Manganese bronzes are tougher to machine.

5. Corrosion Resistance: Aluminum Bronzes and Tin Bronzes (like C90300, C90500) generally offer the best corrosion resistance, especially in marine environments. Leaded Red Brass (C83600) also has good general corrosion resistance.

6. Conformability & Embeddability: The ability of the bushing to deform slightly to match shaft imperfections (conformability) or embed small dirt particles (embeddability) is crucial in some applications. Higher lead content (C93200, C93700) enhances these properties.

7. Lubrication: Leaded bronzes are more forgiving under boundary or marginal lubrication conditions due to the lubricating effect of lead.

8. Operating Temperature: Check specific alloy data sheets for temperature limits.

9. Cost: Prices vary based on composition (Tin is expensive) and market conditions. C83600 and C93200 are often among the more economical choices for general use.

10. Shaft Material & Hardness: High-strength bronzes (like C95400) often require hardened and ground steel shafts for optimal performance and to prevent shaft wear.

Manganese Bronze: The Ideal Choice for High-Performance Bearing Bushings and CNC Components

When it comes to machine bronze bearing bushings and CNC parts, manganese bronze stands out for its reliability in demanding applications where other alloys might falter. Manganese bronze (often alloy C86300, also known as SAE 430B) is a high-strength copper-zinc alloy that includes small amounts of manganese, aluminum, and iron. Despite the name, it only contains about 2.5-5% manganese, yet this small addition significantly enhances its tensile strength (up to 110 ksi), yield strength (62 ksi), and corrosion resistance, all while maintaining excellent wear properties.

Why Choose Manganese Bronze for Bearing Bushings?

Manganese bronze, particularly the C86300 alloy, is an excellent choice when you need a bearing material that can endure heavy loads. Known for its toughness and resistance to corrosion, C86300 (also called SAE 430B) excels in low-speed applications requiring remarkable wear resistance. However, it’s important to note that this alloy does need reliable lubrication and cannot be heat-treated.

Manganese bronze is technically a type of brass, made from a blend of copper and zinc. Manganese is added to improve its strength and rust resistance. While the manganese content is relatively low (2.5-5%), its impact on the material’s performance is profound. With a tensile strength of 110 ksi and a yield strength of 62 ksi, C86300 is perfect for high-strength bushings, valve stems, gears, and wear rings. Its use spans several industries, including earth-moving equipment, wood pulp processing, steel mills, and marine applications.

Key Advantages of Manganese Bronze in Bearings:

1. Exceptional Durability Under Load:
   Manganese bronze bushings offer remarkable resistance to deformation under heavy pressure. With a tensile yield strength of 460 MPa and fatigue strength of 170 MPa, it’s up to 50% stronger than standard tin bronzes, making it ideal for high-stress, low-speed environments.

2. Superior Wear and Corrosion Resistance:
   This alloy resists rust in harsh environments like seawater or chemical exposure and minimizes abrasion, significantly extending the service life—up to 2-3 times longer than aluminum or phosphor bronze.

3. Self-Lubricating Potential:
   While optimal performance requires reliable lubrication, variants of manganese bronze can incorporate lead or graphite to support low-maintenance operation, even in high-friction environments.

4. Limitations:
   Manganese bronze is not heat-treatable and is best suited for low-speed applications (less than 500 RPM). For high-speed applications, you might want to consider alternatives like leaded tin bronze.

Why It Shines in CNC Machining

Manganese bronze is ideal for precision CNC machining. When raw C86300 stock—whether bars, tubes, or castings—is processed, it can be shaped into custom bushings, bearings, and components with tight tolerances (up to ±0.001 inches). Using advanced machining techniques like turning, milling, and 5-axis capabilities ensures precise fits for shafts and housings, essential for high-performance machinery.

Best Practices for Machining Manganese Bronze:

• Tools and Speeds: Use carbide tools at cutting speeds of 200-400 SFM and moderate feeds to prevent work-hardening. Coolants like sulfurized oil help prevent built-up edges.

• Forms Available: Manganese bronze can be machined into straight or flanged bushings, thrust washers, wear plates, and custom gears—often made from continuous or centrifugal castings to ensure uniformity.

• Machinability: While machining C86300 requires precision, it offers excellent results for applications demanding strength, like high-load bushings or gears. It’s often paired with C932 (high-leaded) for easier machining in prototypes.

Performance Comparison: Manganese Bronze vs. Other Alloys

Manganese Bronze Applications Across Industries

• Heavy Machinery: Ideal for bushings in pumps, compressors, and winches, where shock loads are common.

• Marine & Oil/Gas: Provides corrosion-proof parts for propellers, valves, and offshore rigs.

• Automotive/Aerospace: Used for gears and cylinder components that need durability under vibration.

• Custom CNC Examples: Manganese bronze is also used for flanged bushings in mining drills or precision plates for injection molding machines.

Conclusion

Manganese bronze (C86300) offers exceptional strength, wear resistance, and corrosion protection, making it the perfect material for high-performance bearings and CNC components. Whether you’re designing components for heavy machinery, marine equipment, or aerospace applications, this alloy delivers unmatched durability. Suppliers like National Bronze and VIIPLUS offer stock and custom CNC fabrication services, ensuring you get the perfect fit for your needs.

For precise CAD files, tolerances, or prototypes, feel free to reach out for tailored recommendations and design simulations.

Common Material Grades for Self-Lubricating Bronze Bushings, Bearings, and Slider Plate

Tin bronze, phosphor bronze, and aluminum bronze are common copper alloys used in manufacturing self-lubricating components such as bushings, bearings, and sliders. These materials are selected for their excellent wear resistance, corrosion resistance, anti-friction properties, and self-lubricating capabilities. They are especially suited for medium-to-heavy load and low-speed friction applications found in machinery, marine vessels, molds, and construction equipment.

Below is an overview of frequently used material grades based on Chinese National Standards (GB/T) and international standards such as ASTM and JIS. This includes key chemical components, performance characteristics, and typical applications. The selection of a specific grade should also take into account the manufacturing process (casting or forging).

1. Tin Bronze

Tin bronze is primarily composed of tin (3%–14%) as the main alloying element, often with additions of phosphorus, zinc, and lead. This alloy is known for its high mechanical strength, good corrosion resistance, and excellent casting properties with minimal shrinkage, making it ideal for complex castings. Leaded or phosphor variations are often used for self-lubricating bushings and bearings to improve anti-friction and wear-resistance properties.

2. Phosphor Bronze

Phosphor bronze is a type of tin bronze with an addition of 0.03%–0.35% phosphorus, which enhances deoxidation and corrosion resistance. It is known for its high wear resistance, low friction, and self-lubricating properties, making it a popular choice for medium-speed, heavy-load bearings. The phosphorus content can be adjusted depending on whether the material will be cold-worked or cast.

3. Aluminum Bronze

Aluminum bronze contains aluminum (5%–11%) as its primary alloying element, along with iron, manganese, and nickel to improve strength and corrosion resistance. It has lower density, higher hardness, and is highly resistant to seawater corrosion, making it suitable for high-strength, self-lubricating components. It also exhibits a larger casting shrinkage and readily forms an oxide film.

Additional Notes:

Self-lubricating bushings, bearings, and sliders often use materials such as ZCuSnPb5Zn5 (leaded tin bronze), ZCuAl9Fe4Ni4 (a type of aluminum bronze), and PBC2 (cast phosphor bronze) as a base. Solid lubricants like graphite or MoS₂ are embedded into these bases to create a maintenance-free, self-lubricating structure. These components are ideal for low-speed, high-load applications in industries like metallurgy, automotive, and automation.

Material Selection Recommendations:

• Tin bronze is a versatile choice for general wear-resistant applications.

• Phosphor bronze is ideal when elasticity and anti-friction properties are critical.

• Aluminum bronze is preferred for high-strength and corrosion-resistant requirements.

For precise material selection, it is recommended to consult relevant standards such as GB/T 1176 (Cast Copper Alloys) or GB/T 5231 (Wrought Copper and Copper Alloys) and conduct mechanical testing.

Global Designation Cross-Reference System for Cast Copper Alloys

Enterprise-grade data panel, deeply audited and restructured based on the GB/T 8063-2017 Interpretation Report.

JDB Self-Lubricating Bearing Materials

Cross-standard grade reference, material composition, allowable operating limits, and solid lubricant options for JDB oilless (graphite-embedded) bearings and bronze bushings.

The values on this page are typical minimum values, not guaranteed values. Final selection must be confirmed against the engineering specification and the applicable material standard.

1 · Cross-Standard Grade Reference

Each JDB base material grade maps to equivalent designations under major casting and bearing standards. Grey cast iron (HT250) and the bearing-steel option are referenced where applicable; the French NF designation is not published for the high-strength brass grades.

* ISO 1338 was superseded by ISO 4382; the grade designations shown follow the current ISO 4382 system. “NF” column uses “—” where no published French standard grade applies.

2 · Material Composition and Properties

Performance figures are typical minimum values. The JDB-2 / JDB-3 assignment follows the standard JDB grade convention (JDB-2 cast tin bronze, JDB-3 cast aluminium bronze) and is aligned to alloy type. Hardness for Gcr15 is reported in HRC; all other grades in HB.

3 · Solid Lubricants

JDB bearings operate oilless through embedded solid lubricant plugs. Two lubricant systems cover dry-atmosphere and water-lubricated service.

4 · Selection Chart: Allowable Load vs Speed

The chart plots allowable load against allowable dry-running speed; bubble size indicates the allowable PV value. Gcr15 reaches the maximum allowable load (200 N/mm²) while allowing the lowest running speed.

5 · Frequently Asked Questions

What are JDB self-lubricating bearings made of?

JDB bearings use a metal matrix — high-strength brass, cast tin bronze, cast aluminium bronze, high-tin bronze, grey cast iron, or bearing steel — with embedded solid lubricant plugs based on graphite or PTFE.

What is the difference between JDB-2 and JDB-3 materials?

JDB-2 uses cast tin bronze (ZCuSn5Pb5Zn5) for moderate load and low speed. JDB-3 uses cast aluminium bronze (ZCuAl9Fe4Ni4Mn2), which provides greater load capacity and allows a moderate running speed.

How do I choose the right JDB material for an application?

Base the choice on load, speed and PV value. For heavy or over-heavy load at low speed, use high-strength brass (JDB-1 / JDB-1S). For higher running speed, use cast aluminium bronze (JDB-3). For water or seawater service, select an SL4 (PTFE-based) lubricant grade.

What temperature range do JDB bearings operate in?

Most grades operate from -40°C to +400°C; the high-strength brass base (JDB-1) is limited to +300°C. Lubricant limits are 400°C for SL1 graphite and 300°C for SL4 PTFE.

Do JDB bearings need external lubrication?

They are designed for oilless operation: the embedded solid lubricant forms a transfer film on the mating surface. In water and seawater environments, SL4 grades use PTFE-based lubricant.

Are the JDB grades available across international standards?

Yes. Each JDB grade maps to GB, ISO, DIN, JIS, ASTM/UNS and BS designations, and to NF where a published French grade applies; see the cross-standard reference table above.