Lead Gunmetal Bearing Bronze


Lead Gunmetal Bearing Bronze


  • C83600
  • LG2
  • SAE40
  • CuSn5ZnPb
  • BC6C


  • Pressure tight requirements
  • Valve bodies
  • Pump bodies


Leaded gun metal bronze LG2, also known simply as LG2, is a type of bronze alloy renowned for its excellent machinability, corrosion resistance, and mechanical properties. Widely used in engineering applications requiring durability and reliability, LG2 offers a unique combination of characteristics that make it indispensable in various industries. Here's a detailed write-up on leaded gun metal bronze LG2:


Leaded gun metal bronze LG2 primarily consists of copper (Cu) as the base metal, with the addition of tin (Sn), lead (Pb), and other alloying elements to enhance its properties. The typical composition of LG2 alloy includes approximately:
  • Copper (Cu): 85-88%
  • Tin (Sn): 5-7%
  • Lead (Pb): 4-6%
  • Zinc (Zn): 1-2%
  • Other elements: Iron (Fe), Nickel (Ni), Phosphorus (P), and Antimony (Sb) in trace amounts.
The exact composition may vary depending on specific manufacturing requirements and standards.


  1. Machinability: Leaded gun metal bronze LG2 is renowned for its exceptional machinability, making it easy to cut, drill, mill, and turn into intricate components with precise dimensions. The presence of lead in the alloy promotes the formation of short, manageable chips during machining, reducing tool wear and improving machining efficiency.
  2. Corrosion Resistance: LG2 offers good corrosion resistance, particularly in marine and aqueous environments. The combination of copper and tin provides inherent resistance to corrosion, while the addition of lead further enhances the alloy's ability to withstand corrosive elements, making it suitable for applications exposed to moisture and harsh conditions.
  3. Strength and Toughness: LG2 bronze exhibits moderate strength and excellent toughness, allowing it to withstand mechanical stresses and impacts without undergoing deformation or failure. It offers a good balance between strength and ductility, making it suitable for structural components subjected to loading and vibration.
  4. Wear Resistance: Due to its composition and microstructure, LG2 bronze offers excellent wear resistance, making it suitable for applications subject to abrasive wear and friction. It maintains its dimensional stability and surface integrity even under prolonged use in demanding conditions.
  5. Pressure Tightness: LG2 bronze has good pressure tightness, making it suitable for applications requiring leak-free seals and connections, such as valves, fittings, and hydraulic components. Its ability to maintain a tight seal under high pressure contributes to the reliability and performance of hydraulic and pneumatic systems.


  1. Bearing Bushes and Bearings: LG2 bronze is commonly used in the manufacture of bearing bushes, bearings, and bushings due to its excellent machinability, wear resistance, and self-lubricating properties. It provides reliable performance and extended service life in rotating and sliding applications.
  2. Valves and Fittings: LG2 bronze finds extensive use in the production of valves, fittings, and plumbing components due to its corrosion resistance, pressure tightness, and ease of machining. It is suitable for both freshwater and seawater applications, including marine plumbing systems.
  3. Marine Hardware: LG2 bronze is employed in marine hardware such as propeller shaft bearings, stern tubes, rudder bearings, and propeller nuts due to its corrosion resistance and mechanical properties. It withstands exposure to seawater and harsh marine environments, contributing to the reliability of maritime systems and vessels.
  4. Pump Components: LG2 bronze is used in the manufacture of pump components such as impellers, casings, and wear rings due to its wear resistance, corrosion resistance, and machinability. It ensures efficient fluid handling and extended pump service life in various industrial and marine applications.
  5. Electrical Contacts: LG2 bronze is utilized in electrical contacts and connectors requiring good conductivity, corrosion resistance, and machinability. It provides reliable electrical performance in electrical distribution systems, switches, and terminals.


Leaded gun metal bronze LG2 is a versatile alloy with a wide range of applications across multiple industries. Its exceptional machinability, corrosion resistance, mechanical properties, and wear resistance make it invaluable for manufacturing critical components and structures requiring durability, reliability, and performance. Whether in bearings, valves, marine hardware, pump components, or electrical contacts, LG2 bronze continues to demonstrate its value as a versatile and effective engineering material.

  • Flat Bar
  • Square Bar
  • Round Bar / Rod
  • Pipe / Tube
  • Bush / Hollow
  • Wire
  • Shim / Foil
  • Sheet / Plate
  • Cu: Bal%
  • Sn: 4-6%
  • Pb: 4-6%
  • Zn: 4-6%
  • P: 0.05% max
  • Al: 0.005% max
  • Tensile Strength: 221-310 MPa
  • Yield Strength (0.5% ext. under load): 152 MPa (22ksi)
  • Density: 8,719kg/m3

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