At bronzeoilless.com, we understand that choosing the right leaded gunmetal bearing is crucial to mechanical reliability, especially in high-load, low-speed, or limited-lubrication environments. Leaded gunmetal, also called leaded red brass, combines strength, machinability, and self-lubrication—making it a top choice for many industrial applications.

But not all leaded gunmetal alloys are the same. In this guide, we’ll compare C83600 (LG2) and C92410 (LG4)—two of the most widely used leaded gunmetal bearing materials—to help you choose the right alloy for your application.

What is a Leaded Gunmetal Bearing?

A leaded gunmetal bearing is made from a copper-based alloy that typically includes tin, zinc, and lead. Each element contributes unique benefits:

• Copper (Cu): Provides base ductility and thermal conductivity.

• Tin (Sn): Strengthens the alloy by forming hard intermetallic compounds.

• Lead (Pb): Offers solid lubrication. Lead particles disperse within the alloy and create a low-friction layer during operation.

• Zinc (Zn): Enhances castability and acts as a deoxidizer during melting.

These materials form bearings ideal for applications where grease lubrication is minimal or where reliable dry-start performance is essential.

C83600 vs. C92410 Leaded Gunmetal Bearings

C83600 Leaded Gunmetal (LG2 / SAE 40)

The All-Purpose Choice

C83600, known for its 85-5-5-5 composition (Copper-Tin-Lead-Zinc), is a versatile and cost-effective solution. It delivers excellent machinability, castability, and moderate wear resistance—ideal for general-purpose bearings.

Typical Applications:

• Construction machinery bushings

• Hydraulic pump components

• Valve bodies and water pump bearings

• Automotive engine bushings

Key Properties:

• Tensile Strength: ~205 MPa (30,000 psi)

• Hardness: ~60 HB

• Excellent machinability (thanks to high lead content)

• Limited corrosion resistance (not suitable for marine or acidic environments)

C92410 Leaded Gunmetal (LG4 / CuSn6ZnNi)

The Performance Upgrade with Nickel

C92410 improves upon C83600 by adding nickel, which enhances strength, corrosion resistance, and high-temperature stability. It’s designed for harsher environments and more demanding applications.

Typical Applications:

• Marine components: propeller shaft bearings, rudder bushings

• Oil & gas: pump components, valves exposed to saltwater

• Compressors and turbocharger bushings

• Engine connecting rod bearings

Key Properties:

• Tensile Strength: ~240 MPa (35,000+ psi)

• Better resistance to fatigue and impact

• Excellent corrosion resistance in seawater and brine

• Higher operating temperatures (up to 220°C / 425°F)

• Slightly reduced machinability due to lower lead content

Comparison Chart: C83600 vs. C92410

How to Choose the Right Leaded Gunmetal Bearing

✅ Choose C83600 If:

• You need cost-effective bearings for freshwater or indoor applications.

• The design involves low-to-moderate speeds and high shock loads.

• You require excellent machinability and fine surface finishes.

• Your components include pump housings, valve bodies, or general bushings.

✅ Choose C92410 If:

• Your application is exposed to saltwater, chemicals, or brine.

• High-speed, cyclical loads, or thermal stress are involved.

• You require superior fatigue strength and long-term reliability.

• The extra cost is justified by longer service life or reduced maintenance.

✅ Choose C92610A If:

You need a reliable, all-purpose bearing for moderate loads and speeds.

Excellent machinability and good wear resistance are priorities.

You require good anti-friction properties and resistance to seizure.

You are looking for a cost-effective solution with a proven track record in general machinery.

Pro Tips for Leaded Gunmetal Bearings

• Although both alloys offer self-lubrication, performance improves dramatically with proper grease (e.g., lithium-based grease).

• C83600 works better in dry-start or poorly lubricated environments due to higher lead content.

• For precision machining, always factor in lead content, which impacts surface finish and tool life.

Leaded gunmetal bearings continue to be a go-to choice across industries due to their self-lubricating properties, castability, and mechanical strength. Your selection should depend on:

• Load & Speed: Shock or fatigue?

• Operating Environment: Saltwater, freshwater, or indoor?

• Budget vs. Performance: Initial cost vs. lifecycle cost?

At bronzeoilless.com, we manufacture both C83600 and C92410 leaded gunmetal bearings with high precision and can customize your order to meet specific design or lubrication needs. Whether it’s for marine, heavy machinery, or engine components—we help you get the job done right.

Need help selecting the right alloy? Contact our technical team today.