manganese bronze flanged bearing with graphite plugs, designed for a crane's boom to withstand immense shock loads without external lubrication.
A manganese bronze thrust washer with visible graphite plugs, specifically engineered to handle extreme pressure in a steel mill press.

Manganese Bronze: The Ultimate Solution for Extreme-Duty Bearings

In the world of high-performance machinery, some applications demand materials that can withstand more than just normal wear and tear. They require superior strength, exceptional corrosion resistance, and the ability to operate flawlessly without lubrication. Manganese bronze is the material of choice for these challenges. As a premier manufacturer of oil-free bearings, we specialize in leveraging the unique properties of manganese bronze to create components that are robust, reliable, and ready for the most demanding industrial, marine, and heavy-duty environments.

A Technical Deep Dive: Our Manganese Bronze Alloys

Manganese bronze is a family of high-strength copper-based alloys where zinc, manganese, and aluminum are key alloying elements. The combination of these elements produces a material with superior tensile strength, excellent resistance to impact, and a high hardness rating. This makes manganese bronze a go-to choice for applications that require a bearing to withstand heavy, non-uniform loads and shock.

The following table provides a detailed look at the chemical composition and key mechanical properties of our core manganese bronze alloys, all manufactured to stringent ASTM and CDA standards.

Chemical Composition & Key Properties

CDA Number Cu (%) Mn (%) Zn (%) Sn (%) Pb (%) Fe (%) Other (Al, Ni) Typical Properties
C86100 66-68 2.5-5 Rem. – – 2-4 Al 4-5.5 Strength: 90,000 psi tensile; Hardness: 180-220 BHN.
Excellent for heavy-duty, corrosive environments.
C86200 60-66 2.5-5 22-28 – – 2-4 Al 3-4.9, Ni <1 Strength: 95,000 psi tensile; Hardness: 180-220 BHN.
High-strength brass for medium-load bearings.
C86300 60-66 2.5-5 22-28 – – 2-4 Al 5-7.5, Ni <1 Strength: 110,000-119,000 psi tensile; Hardness: 225-250 BHN.

Highest strength for heavy-duty, low-speed applications.
C86400 56-62 <1 34-42 – <1 0.4-2 – Strength: 60,000 psi tensile; Hardness: 100-130 BHN.

Good machinability for light-load applications.
C86500 55-60 <3 36-42 0.5-1 0.5-1.3 0.4-2 – Strength: 70,000 psi tensile; Hardness: 130-140 BHN.

Corrosion and fatigue resistance for medium loads.
C86700 55-60 1-3.5 30-38 <1.5 0.5-1.5 1-3 – Strength: 85,000 psi tensile; Hardness: 150-170 BHN.

Excellent castability for corrosive environments.

Contrasting Logic: Manganese Bronze vs. Leaded Bronze

While both alloys are essential for oil-free applications, their properties and ideal use cases are fundamentally different.

Feature Manganese Bronze (C86xxx) Leaded Bronze (C8xxx, C9xxx)
Primary Strength Exceptional. High tensile strength (up to 119,000 psi) and hardness for extreme loads. High. Good strength (e.g., 60,000 psi), but relies on tin for hardness.
Wear & Friction High Wear Resistance. Designed for heavy, low-speed, high-impact applications. Low Friction. Lead content provides inherent lubricity, ideal for medium loads and speeds.
Corrosion Resistance Excellent. Very effective in marine and industrial environments. Good. Suitable for many applications, but can be less robust in severe conditions.
Best For Heavy-duty earth-moving equipment, press machinery, and ship propellers that require high strength and resistance to shock. General industrial bearings, pumps, and valves where good lubricity and moderate strength.

Manganese Bronze in Action: Applications for Oil-Free Bearings

Our expertise lies in matching the right manganese bronze alloy to the right application, ensuring maximum performance and longevity.

1. Extreme Strength & Heavy-Duty Bearings (C86300)

This is our flagship high-strength alloy.

  • Applications: Used in heavy earth-moving equipment like track rollers and bucket joints, mining crushers, and rolling mills where components must endure extreme loads and constant shock.
  • Bearing Types: Cast sleeve bearings and thrust washers made from C86300 are perfect for heavy-duty, low-speed applications and can handle over 110,000 psi tensile loads.

2. High-Wear & Corrosive Environments (C86100 & C86700)

These alloys are perfect for applications that combine heavy loads with corrosive elements.

  • Applications: Ideal for marine propellers and shaft seals, as well as pump components and chemical valves in the petrochemical industry.
  • Bearing Types: We use cast sleeve bearings and flanged bearings to provide high-strength support in corrosive environments like seawater, where they offer excellent wear and fatigue resistance.

3. Medium-Load & High-Speed Bearings (C86200)

With a balance of strength and durability, C86200 is a versatile alloy.

  • Applications: Used in gearboxes, compressors, and medium-load machinery like presses and construction vehicles, where it provides excellent wear resistance.
  • Bearing Types: Continuous cast sleeve bearings and thrust washers made from C86200 deliver reliable performance in these demanding, mid-range applications.

The Power of Self-Lubrication: Graphite Plugs & Grooves

To unlock the full potential of manganese bronze in oil-free environments, we pair it with advanced self-lubricating designs.

  • Graphite Plugged Bearings: By embedding solid graphite plugs into the bronze matrix, we create a bearing that provides continuous lubrication without a single drop of oil. This is vital for furnace bearings in steel mills, crane arms, and hydraulic cylinders where extreme temperatures and high loads are common. The graphite ensures low friction and a long service life, even in dry-running conditions.
  • Grooved Bearings: Designing grooves into the bearing surface allows us to retain solid lubricants or provide a pathway for self-lubrication. This is perfect for wear plates, shaft sleeves, and valve guides in heavy equipment and marine pumps. The grooves enhance lubrication and heat dissipation, ensuring the bearing performs optimally in environments where manual lubrication is difficult or impossible.
Type of Self-Lubrication Key Features & Technical Details Key Applications & Specific Parts
Graphite Plugged Bearings – Mechanism: Solid graphite plugs embedded into the bronze matrix.
– Coverage: 20-30% of the surface area.
– Conditions: Effective from -40°C to 400°C, at low speeds (<0.5 m/s), and under heavy loads (PV values up to 75,000 psi·ft/min).
– Benefits: Provides continuous, oil-free lubrication with a low friction coefficient (0.04-0.2).		 – Steel Mills: Furnace bearings, door hinges.
– Heavy Machinery: Crane arm joints, press plungers.
– Marine & Hydro: Water dam gates, marine pump shaft seals.
– Automotive & Mining: Suspension joints, crusher roller supports.
Grooved Bearings – Mechanism: Precision-cut grooves (spiral or straight) in the bearing surface.
– Function: Retains solid or liquid lubricants to optimize distribution and heat dissipation.
– Conditions: Suitable for high-load, low-speed, or corrosive environments where manual lubrication is difficult.
– Benefits: Enhances lubrication efficiency by 1.5-2 times, reduces friction, and prevents seizing.		 – Industrial & Heavy Equipment: Shoulder bushings, wear plates, valve guides.
– Molding & Hydraulics: Die guide pillars, hydraulic piston guides.
– Marine & Chemical: Marine pump shaft seals, chemical mixer components.

Conclusion: Your Partner in Bearing Excellence

Our comprehensive range of manganese bronze alloys provides the ultimate solution for oil-free bearings in the most challenging environments. By leveraging their superior strength and wear resistance—enhanced by our advanced self-lubricating designs—we deliver components that ensure your machinery operates at peak performance, without the need for constant maintenance.

Ready to find the perfect bearing for your heavy-duty application? Contact us today to learn how our manganese bronze solutions can provide the strength and durability you need.

At Bearingface.com, we are more than suppliers; we are technical partners dedicated to solving your toughest friction and wear challenges. By choosing us, you are investing in quality, expertise, and a commitment to performance. Stop compensating for inadequate bearings. It’s time to engineer failure out of your system.

Oil-free bearing alloys produced. We help you specify the correct self-lubricating bronze parts and components for your machinery.