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Gunmetal Bush

Introduction to Gunmetal Bushes

Gunmetal bushes, also known as gunmetal bearings or simply gunmetal bushings, are cylindrical components used in various mechanical applications to reduce friction, distribute loads, and provide guidance to moving parts. Made from gunmetal, a type of bronze alloy that contains tin, lead, and copper, these bushes are valued for their self-lubricating properties, durability, and resistance to wear.

Gunmetal bushes are crucial in machinery where metal-to-metal contact could lead to excessive wear or where the use of lubricants is undesirable or impractical. Their self-lubricating nature, derived from the lead content in the alloy, makes them ideal for applications that require low maintenance and reliable performance over extended periods.

The gun metal bush hsn code is usually:

HS Code 7419.99: This code pertains to other articles of copper, including articles of copper alloys such as bronze (gunmetal).

Applications Of Gunmetal Bush

Gunmetal bushes find use in a wide array of industries and applications due to their versatile properties. Some of the key areas where gunmetal bushes are applied include:

  • Automotive Industry: In engines, transmissions, and suspension systems, gunmetal bushes provide support and reduce friction in various moving parts.
  • Marine and Offshore: The corrosion resistance of gunmetal makes it suitable for use in harsh marine environments where components are exposed to saltwater and humidity.
  • Aerospace: The strength and durability of gunmetal bushes make them ideal for use in aircraft and aerospace applications where reliability and lightweight are paramount.
  • Industrial Machinery: In manufacturing and heavy machinery, gunmetal bushes are used to support moving parts and reduce wear in high-load applications.
  • Construction Equipment: In heavy equipment such as excavators and cranes, gunmetal bushes help to ensure smooth operation and longevity of mechanical components.
Gunmetal Bush
Gunmetal Bush

Alloy Composition of Gunmetal

Gunmetal is a type of bronze alloy that traditionally contains a high percentage of tin, with copper as the base metal, and small amounts of lead. The specific composition can vary depending on the desired properties and applications, but it generally includes:

  • Tin: The primary alloying element, which increases the strength and hardness of the bronze.
  • Copper: The base metal that provides good electrical and thermal conductivity, as well as corrosion resistance.
  • Lead: Added for its self-lubricating properties, which reduce friction and wear, especially under heavy loads.

The exact ratios of these elements can be adjusted to achieve specific mechanical properties or to optimize performance for particular applications.

Gunmetal Bush’Physical Properties: Strength and Ductility

Gunmetal exhibits a combination of physical properties that make it suitable for use in bushings and bearings:

  • Strength: The high tin content in gunmetal provides increased strength and hardness, which allows it to withstand heavy loads and resist deformation.
  • Ductility: Despite its strength, gunmetal retains good ductility, enabling it to be cast into complex shapes and sizes.
  • Elastic Limit: Gunmetal has a high elastic limit, meaning it can endure significant stress without permanent deformation.

Chemical Properties: Corrosion Resistance

  • Resistivity to Corrosion: The presence of copper and tin in the alloy provides inherent resistance to various forms of corrosion, making gunmetal suitable for use in environments where exposure to moisture, chemicals, or saltwater is a concern.
  • Stability: Gunmetal maintains its properties over time, with minimal risk of degradation or corrosion, even in harsh conditions.
Gunmetal Bush
Gunmetal Bush

Self-Lubricating Gunmetal Bush

One of the key components of gunmetal is lead. The lead acts as a natural lubricant, significantly reducing the coefficient of friction between moving parts. This inherent lubrication minimizes wear and tear, extending the lifespan of the components.

  • Low Friction: The self-lubricating property of gunmetal is especially beneficial in environments where external lubricants might be impractical or where such lubricants would rapidly degrade. This makes gunmetal bushes ideal for applications in challenging conditions, ensuring smooth operation without the constant need for reapplication of lubricants.
  • Maintenance Reduction: The ability of gunmetal to self-lubricate translates to a substantial reduction in maintenance requirements. This is a critical advantage in industrial and mechanical applications, where minimizing downtime and maintenance costs is essential. With gunmetal bushes, the need for frequent lubrication is drastically reduced, resulting in more efficient and cost-effective operations.

Manufacturing Process of Gunmetal Bushes

  1. The manufacturing of gunmetal bushes begins with casting, a process where molten gunmetal is poured into a mold with the desired shape: 1.1. Sand Casting: A traditional method where sand molds are used. It’s suitable for small to medium production runs.
    1.2. Gravity Die Casting: Involves pouring molten metal into a mold under the force of gravity. It allows for greater detail and complexity in the design.
    1.3. Investment Casting (Lost Wax): A precise casting method where a wax pattern is used to create a detailed shell mold. This method is ideal for complex shapes and higher precision requirements.
  2. Once the casting is complete, the rough bushing is subjected to various machining processes to achieve the required dimensions and tolerances:
  3. Heat Treatment Processes: is is often employed to enhance the mechanical properties of gunmetal bushes.
  4. Quality Control and Assurance
Gunmetal Bush with solid lubricant
Gunmetal Bush with solid lubricant

Types and Variants of Gunmetal Bushes

Gunmetal bushes are available in both standard sizes and shapes, as well as custom designs tailored to specific applications

Bushings can be manufactured as solid or split types:

  • Solid Bushes: Traditional cylindrical bushes that are used in applications where the entire circumference needs to be in contact with the moving parts.
  • Split Bushes: Designed to be easily fitted around shafts or other components, these are particularly useful for applications where assembly space is limited.

The design of the bushing can also include flanges or be plain:

  • Flanged Bushes: Have additional flanges or shoulders that provide support and positioning.
  • Plain Bushes: Are simple cylindrical shapes without any additional features, suitable for straightforward applications.

Some gunmetal bushes come with integrated features to enhance their functionality:

  • Integrated Flanges: Provide a means of locating and fixing the bushing in place.
    Keyways: Allow for the attachment of other components, such as gears or pulleys.
  • Oil Grooves: If external lubrication is used, these grooves can help distribute the lubricant evenly.

Difference between Gunmetal Bush, Brass Bush

Gunmetal and brass bushes are both used in mechanical systems to reduce friction and wear, but they have distinct differences:

Material Composition:

  • Gunmetal Bushes: Made of copper, zinc, and tin, sometimes with nickel and lead (nickel gunmetal and leaded gunmetal). Phosphorous can be added for heavy-duty applications.
  • Brass Bushes: Composed of copper and zinc. They are known for flexibility, moldability, hardness, and anti-rust properties.


  • Gunmetal Bushes: Known for good strength, corrosion resistance, and ease of casting. Suitable for moderate speeds and loads in machinery.
  • Brass Bushes: Valued for self-lubricating properties and ability to withstand high temperatures.

Manufacturing and Customization:

  • Gunmetal Bushes: Manufactured through sand casting, gravity die casting, and investment casting. Can be customized to specific material specifications and quantities.
  • Brass Bushes: Can be customized in size and weight to fit specific designs. Available as sleeve bearings, flange bearings, and thrust bearings.
  • Gunmetal Bushes: Used in heavy-load applications, unreliable lubrication scenarios, and for pressure-tight castings like pipe fittings, valves, and pumps.
  • Brass Bushes: Common in automotive water pumps, electric motors, slide bearings, fishing reels, stage lights, printer rollers, ATMs, escalators, and surveillance systems