High-Load Lead-Tin Bronze Bearing | Durable & Anti-Friction

bronzeoilless.com | Experts in Self-Lubricating Bronze Alloys

In industrial machinery, where friction, wear, and lubrication challenges are constant threats, Lead-Tin Bronze Bearings have proven to be a dependable solution for over a century. These copper-based alloys are engineered to balance strength, wear resistance, and built-in self-lubrication—solving up to 80% of common bearing issues across industries.

Whether it’s supporting a camshaft in an automotive engine or stabilizing the rudder of a supertanker, lead-tin bronze bearings operate reliably under high loads, low speeds, and imperfect lubrication. At bronzeoilless.com, we offer a full range of these high-performance alloys, precision-machined to meet your exact application requirements.

What Is a Lead-Tin Bronze Bearing?

The Science Behind Self-Lubrication

A Lead-Tin Bronze Bearing is made from a copper alloy strengthened with tin (Sn) and enhanced with lead (Pb). Each element plays a vital role:

• Copper (Cu): Provides the alloy’s structural backbone with ductility and toughness.

• Tin (Sn): Enhances strength and hardness via solid solution strengthening.

• Lead (Pb): Disperses as microscopic particles that smear during operation to form a natural lubricating layer.

This self-generated lubrication film reduces metal-to-metal contact, minimizes friction, and protects mating surfaces—especially during start-up or under boundary lubrication conditions.

Key Lead-Tin Bronze Bearing Alloys at bronzeoilless.com

C93200 (SAE 660, CuSn7ZnPb, LB3) – The Most Popular Lead-Tin Bronze Bearing Alloy

Overview:
Known as “Bearing Bronze,” C93200 is the most widely used lead-tin bronze bearing alloy. With a well-balanced composition, it delivers excellent all-around performance.

Properties:

• Good compressive strength and hardness

• Excellent machinability

• High corrosion resistance in seawater and saline environments

• Excellent wear resistance under moderate loads and speeds

Typical Applications:

• Bushings, thrust washers, and bearings in pumps, valves, cylinders, and cranes

• Sliding bearings in electric motors and generators

• Ideal for light gears and sprockets

C93700 (937B, SAE 64, LB2, CuPb10Sn) – High-Lead Lubricating Bronze

Overview:
C93700 is a classic lead-tin bronze bearing alloy with a high lead content (typically 8–11%), which gives it superior embeddability and self-lubrication. This makes it ideal for applications with dirty operating conditions or poor lubrication.

Properties:

• Excellent anti-friction performance

• High thermal conductivity

• Relatively low mechanical strength

• Excellent machinability

Typical Applications:

• Medium to high-speed, heavy-duty conditions with potential lubricant contamination

• Heavy machinery bushings, high-pressure pump bearings, crankshaft sleeves, gearbox bushings

• Corrosion-resistant components in pumps and impellers for acidic or sulfite environments

C92700 – High-Strength, Low-Lead Performer

Best for demanding, high-load environments with reliable lubrication.

• Composition: 88% Cu, 10% Sn, 2% Pb

• Benefits:

  • High tensile strength and hardness

  • Excellent wear resistance

  • Marine and industrial corrosion resistance

• Applications: Worm gears, valve stems, rolling mill bushings.

C93500 (935B, LB3) – Strengthened Lead-Tin Bronze Bearing

Overview:
C93500 features slightly lower lead content than C93700, offering improved strength and fatigue resistance while maintaining good lubricating qualities.

Properties:

• Higher strength and hardness compared to C93700

• Good wear resistance and machinability

• Well-suited for dynamic applications

Typical Applications:

• Medium to high-load bearings operating at moderate speeds

• Landing gear bushings

• Hydraulic pump bearings, motor wear plates, and pump impellers

• Suitable for light-load, high-speed shaft sleeves

SAE 660 (C93200 / CuPb10Sn10) – High-Tin, High-Lead Bronze Bearing Alloy

Standard References:

• SAE Standard: SAE 660

• ASTM Standard: C93200

• Chinese GB Equivalent: ZCuPb10Sn10

Chemical Composition:

• Tin (Sn): 9.0–11.0%

• Lead (Pb): 8.0–11.0%

• Copper (Cu): Balance

Key Characteristics:

• Excellent Anti-Seizure Performance: Ideal for start-stop conditions under heavy loads.

• High Fatigue Strength: Load-bearing capacity up to 100 MPa.

• Superior Bonding Ability: Well-suited as the friction layer in bimetal bearings.

• Impact Resistance: Capable of withstanding the shock loads common in heavy-duty equipment.

This versatile lead-tin bronze bearing alloy is widely used in automotive and industrial applications where durability, machinability, and anti-friction properties are critical.

CuPb5Sn (LB4) – High-Strength Leaded Bronze for Heavy Loads

Overview:
CuPb5Sn is a lead-tin bronze bearing with lower lead content, resulting in higher strength and fatigue resistance. It excels under high surface pressure and shock loads.

Properties:

• High strength and wear resistance

• Performs well under low-lubrication or misalignment conditions

• Maintains structural integrity under heavy impact

Typical Applications:

• Railway bearing components

• Rolling mill bearings

• Diesel engine crankshaft bushings

• Excavator and construction machinery sleeves

930D – High-Lead Bronze for Low-Speed, High-Load Conditions

Overview:
930D is a general classification for high-lead lead-tin bronze bearings, often comparable to C93700. Its exact composition may vary by manufacturer but is consistently known for superb anti-friction and self-lubricating behavior.

Typical Applications:

• Heavy-duty applications where lubrication is unreliable

• Bearings and bushings in industrial machinery, mining equipment, and off-road vehicles

• Ideal for low to medium-speed, high-load systems

Quick Comparison: Which Lead-Tin Bronze Bearing is Right for You?

Selecting the Right Lead-Tin Bronze Bearing

Use the following criteria to guide your selection:

• High Load, Low Speed: Choose C92700 for its superior strength.

• Low Load, High Speed: Opt for C93700’s exceptional lubricity.

• Shock Loads: C93500 absorbs impact energy well.

• Poor Lubrication Conditions: C93700 or C93200 are ideal.

• Marine or Corrosive Environments: C93500 and C92700 resist corrosion effectively.

• Tight Machining Tolerances: C93200 is the easiest to machine.

Proven Performance with Lead-Tin Bronze Bearings

At bronzeoilless.com, we understand the demands of real-world machinery. Our Lead-Tin Bronze Bearings offer dependable performance in applications where other materials fail—thanks to their self-lubricating nature, machinability, and strength.

Whether you’re building for performance, longevity, or cost-efficiency, there’s a lead-tin bronze alloy that fits your application. From SAE 660 (C93200) to high-lead C93700 and high-strength C92700, our team is ready to help you select or customize the right solution.

Lead-Tin Bronze Bearings for Crushers, Engines & Gearboxes: The Reliable Choice for Heavy-Duty Machinery

Published by bronzeoilless.com

In the world of heavy industrial machinery, where equipment is constantly pushed to its limits, reliability isn’t optional—it’s essential. Whether it’s a rock crusher pulverizing tons of material per hour, an engine operating at extreme temperatures, or a gearbox transmitting high torque under load, the components inside must be engineered for performance and endurance.

That’s where Lead-Tin Bronze Bearings come into play.

These time-tested alloys have been a staple in mechanical systems for over a century—especially in high-friction, high-load applications. At bronzeoilless.com, we specialize in supplying lead-tin bronze bearings tailored for demanding environments such as crushers, internal combustion engines, and industrial gearboxes.

1. Lead-Tin Bronze Bearings in Crushers

Crushers—especially jaw and cone crushers—face extreme operating conditions: high loads, vibration, shock, and dust contamination. Bearings in these machines must:

• Withstand crushing forces

• Handle low-speed, high-load rotation

• Resist contamination and impact

C93200 and C93700 bearings excel here. Their ability to embed abrasive particles and maintain lubrication makes them ideal for crusher bushings, thrust washers, and bearing pads.

Common components using lead-tin bronze in crushers:

• Eccentric sleeves

• Mainshaft bushings

• Toggle plate bearings

• Pin bushings

2. Lead-Tin Bronze Bearings in Engines

Engines, especially internal combustion types, are subject to high-speed oscillating loads, frequent start-stops, and thermal cycling. Lead-tin bronze is often the alloy of choice for:

• Camshaft and crankshaft bushings

• Connecting rod bearings

• Valve guides and seats

C93700 (high-lead bronze) is widely used in these areas due to its:

• Superior seizure resistance

• High conformability to shaft irregularities

• Performance under boundary lubrication

It’s especially valuable in diesel engines where load spikes and high oil temperatures are frequent.

3. Lead-Tin Bronze Bearings in Gearboxes

Industrial gearboxes operate under sustained torque, fluctuating loads, and often harsh conditions. Bearings must manage:

• Metal-to-metal contact

• Misalignment

• Gear vibration

C93500 and C93200 are common picks for gearbox bushings and thrust bearings due to their:

• Fatigue resistance

• Good damping capacity

• Excellent performance under mixed lubrication regimes

These alloys are also capable of handling shock loads common in conveyors, mixers, and crushers’ drive gearboxes.

Alloy Selection Guide for Crushers, Engines & Gearboxes

At bronzeoilless.com, we offer:

• Custom machining based on your drawing or sample

• Solid and oilless bearing options

• Material consultation for extreme applications

• Fast turnaround for maintenance and OEM projects

Engineered for Extreme Conditions

Whether you’re maintaining a high-tonnage crusher, overhauling an industrial gearbox, or building a high-performance engine, Lead-Tin Bronze Bearings offer the strength, lubricity, and durability required for peak performance.

For expert guidance and high-quality bronze bearings tailored to your needs, contact our team at bronzeoilless.com.