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graphite impregnated bronze – Sleeve & Flange More, solid bushing, bronze with lubricant plugs embedded, Manufacturer of custom machined bronze parts, C86300 (SAE 430B) Manganese Bronze
In the realm of industrial machinery, longevity and efficiency are paramount. One of the key components that contribute to the extended service life and operational efficacy of machinery are bushings. Among the various types of bushings available, graphite plugged bronze bushings stand out due to their unique self-lubricating properties and exceptional durability. In this blog post, we will explore the features, benefits, and applications of graphite plugged bronze bushings, making it easier for you to choose the right components for your machinery. The plugs cover about 25% of the slide bearing and curved plate’s area. Manufacturer of standard and custom plain and slide bushings. Types include metal-polymer, engineered composite, metal, bi-metal bearings, …
What Are Graphite Plugged Bronze Bushings?
Graphite plugged bronze bushings are a type of self-lubricating bearing designed to provide maximum durability and maintenance-free operation in a wide range of industrial applications. These bushings are made from high-quality bronze that is embedded with solid graphite plugs. The graphite acts as a lubricant, releasing small amounts of lubricating material during operation to reduce friction and wear.
Solid Lubricants in Bronze Graphite Slide Bearings: The bronze graphite slide bearing material system utilizes solid lubricants known for their excellent film-forming capabilities, adhesive strength, surface affinity, and corrosion resistance. solid lubricants, with additional variations available for specialized applications. Notably, the high-purity natural graphite employed in the system is untreated chemically, ensuring it remains inert. This property prevents any electrolytic and chemical activities that could originate from the materials.
Solid Journal Bushings with Manganese Bronze Backing – Essential Features and Advantages
Bronze with lubricant plugs embedded Solid lubricant surface: app. 25-30% , Other commonly used bronze alloys: CuAl10Ni, CuSn12Pb, CuSn7ZnPb， Standard products are available in various sizes
Self-Lubricating: Perhaps the most significant advantage of graphite plugged bronze bushings is their self-lubricating capability. These bushings do not require additional oil or grease, which can be particularly beneficial in environments where lubricants could attract dirt or debris, recognized to premature wear or failure.
Excellent Wear Resistance: The combination of bronze and graphite ensures excellent wear resistance. Bronze provides a strong, durable base material, while graphite facilitates a lower friction coefficient, enhancing the bushing’s overall lifespan and performance.
Wide Operating Temperature Ranges: Graphite plugged bronze bushings are capable of operating in extreme temperature conditions, ranging from -415°F to 1,100°F. This makes them suitable for applications in cryogenic environments as well as high-temperature settings.
Graphite-impregnated bronze solid journal bushings in metric sizes, featuring graphite fill for all groove styles and drilled hole components.
Solid lubricant-plugged bronze bearings provide a durable solution for applications requiring high wear resistance, impact stress insensitivity, and resilience in harsh conditions. Their self-lubricating nature and low maintenance make them ideal for various industrial uses. Bronze bearings with embedded lubricant plugs are perfect for demanding applications such as cranes, mining equipment, construction machinery, offshore and marine environments, steel plants, and hydropower installations. These self-lubricating bearings operate reliably under extreme conditions without regular maintenance, making them ideal for industries where frequent lubrication is difficult or impractical. Graphite-plugged bronze bushings are versatile and suitable for various industrial applications, including but not limited to:
Valves and pumps: They provide reliable, maintenance-free operation in fluid handling equipment.
Heavy machinery: Ideal for construction and mining equipment where dirt and debris are prevalent.
Selecting the Right Bushing for Your Needs, Plug Graphite Bearings, Graphited Bronze Bearings – Special Machining
Graphite fill is applied in grooves and drilled holes for its self-lubricating properties. It is ideal for bushings with intermittent use or in low-speed environments where an oil film cannot develop due to insufficient RPMs. Additionally, graphite performs well in high-RPM settings by providing lubrication during startup, shutdown, and sudden shock loads. Click here to view standard graphite patterns. All special machining requirements must be quoted. Oil Grooving – Special Machining: Standard Randall groove styles fulfill most requirements. Special designs or combinations can be furnished if desired. In ordering, specify type and depth of groove and whether it should run out the ends
For special graphite requirements, please contact viiplus. When selecting a graphite-plugged bronze bushing, consider the following factors:
- Load Capacity: Ensure the bushing can withstand the operational loads of your application.
- Environment: Consider the environmental conditions such as temperature, presence of corrosive elements, and potential contamination.
- Size and Fit: Accurate sizing is crucial for optimal performance. Custom sizes can be manufactured to meet specific requirements.
Custom Solutions, Oilless Graphite Brass Bushing, Solid Self-Lubricating Embedded Bronze Bearing.
Custom graphite-plugged bronze bushings are available for applications requiring specific dimensions or unique properties beyond standard options. Our suppliers deliver tailored solutions that meet precise operational requirements, ensuring optimal machinery performance. The catalog includes solid-lubricating oil-free graphite metric bearings, oilless impregnated graphite brass bushings, straight copper types, and solid self-lubricating embedded bronze bearings.
Graphite Filled Bronze Bushes – High-Performance Self-Lubricating Bearings
Graphite filled bronze bushes are advanced self-lubricating bearings engineered for demanding applications. By combining the durability of high-tensile manganese bronze with the low-friction properties of graphite, these bushes deliver excellent wear resistance, corrosion protection, and thermal conductivity. They are the ideal solution for environments where conventional lubrication is impractical, such as high-load, low-speed operations or extreme temperature conditions.
Key Features of Graphite Filled Bronze Bushes
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Self-Lubricating – Graphite impregnation removes the need for external lubrication, lowering downtime and maintenance costs.
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Low Friction – Embedded graphite reduces friction, improving performance and extending service life.
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High Wear Resistance – Designed to withstand heavy loads, shock, and harsh operating conditions.
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Corrosion Resistance – The bronze base ensures durability in water-rich or chemically aggressive environments.
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Thermal Conductivity – Efficient heat dissipation ensures stable performance at elevated temperatures.
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Dimensional Stability – Maintains accuracy and reliability under fluctuating loads and temperatures.
Material Composition
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Base Alloy: High-tensile manganese bronze
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Cu: 60–65%
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Zn: balance
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Al: 3–7.5%
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Fe: 2–5%
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Mn: 2.5–5%
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Pb: 3%
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Graphite: 1.5%
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Properties:
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Density: 6.7 g/cm³
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Tensile Strength: 450 MPa
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Hardness: 180–210 BHN
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Elongation: 15%
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Porosity: 15–25%
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Load Capacity: 750 N/mm²
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PV Value: 20 N/cm²
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Production Process
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Powder Metallurgy: Bronze powder mixed with graphite is sintered to form a porous structure.
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Graphite Impregnation: Porous bronze is filled with graphite for permanent self-lubrication.
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Precision Engineering: Tight manufacturing tolerances ensure consistent quality and high performance.
Applications of Graphite Filled Bronze Bushes
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Automotive: Engine components, suspension systems, and steering mechanisms.
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Heavy Manufacturing: Presses, crushers, conveyors, and other high-load equipment.
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Aerospace: Critical parts requiring high wear resistance, thermal stability, and corrosion protection.
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Industrial Machinery: Pumps, valves, and machines operating in harsh or wet environments.
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Special Conditions: Locations where oil contamination is unacceptable, or where lubrication is difficult (e.g., dusty, high/low temperature, or inaccessible areas).
Benefits
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Reduced Maintenance: Permanent lubrication lowers service intervals and costs.
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Extended Equipment Life: Superior wear resistance improves reliability and uptime.
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Cost-Effective: Ideal for high-load, low-speed, or non-lubricated conditions where traditional bearings fail.
Modern Design Challenges for Modern Bearing Materials
Oilless Bearings Benefits:
High Load Capacity: The high-strength bronze can support substantial loads without deforming.
Low Maintenance: The self-lubricating properties reduce the need for regular maintenance and re-lubrication.
Long Service Life: The combination of material strength and self-lubrication contributes to a longer service life.
Resilience to Wear: The hardness achieved through heat treatment helps resist wear, even under continuous operation.
Versatility: These bearings can be used in a variety of applications, including industrial machinery, automotive suspension systems, and heavy equipment, where they can operate reliably in challenging conditions.
Solid Bronze Self-Lubricating Bushing: Our Self-Lubricating Solid Bronze Guided Ejection Bushings are engineered for optimal performance in high-temperature and rapid-cycle environments, making them perfect for high-output manufacturing tools. These premium bushings feature oil-impregnated graphite plugs that minimize maintenance and reduce wear and galling.
Solid Aluminum Bronze with Graphite Plugs: Maintenance-Free
| Material Type | Code | China GB1176-87 | International ISO 1338 | Germany DIN | Japan JIS | USA ASTM(UNS) | UK BS | France NF | Applicable Situation |
|---|---|---|---|---|---|---|---|---|---|
| High Strength Alloy Copper | JDB650 | ZCuZn25Al6Fe3Mn3 | GCuZn25Al6Fe3Mn3 | DIN1709 | G-CuZn25Al5 | H5102 | CAC304 | B30-92 | C86300 |
| Super High Strength
Alloy Copper |
JDB650 S1 | ZCuZn25Al6Fe3Mn3 | GCuZn25Al6Fe3Mn3 | DIN1709 | G-CuZn25Al5 | H5102 | CAC304 | B30-92 | C86300 |
| Cast Tin Bronze | JDB650 S2 | ZCuSn5Pb5Zn5 | GCuPb5Sn5Zn5 | DIN1705 | G-CuSn5ZnPb | H5111 | BC6 | B30-92 | C83600 |
| Cast Aluminum Bronze | JDB650 S3 | ZCuAl9Fe4Ni4Mn2 | GCuAl10FeNi5 | DIN17656 | G-CuAl10Ni | H5114 | AlBC3 | B30-92 | C95500 |
| Cast Iron | JDB(HT250) | GB5675-85 | HT250 | FC250 | ASTM Class40 | – | – | – | – |
| Code | JDB650 | JDB650 S1 | JDB650 S2 | JDB650 S3 | JDB650 S4 | JDB (HT250) | JDB (Gcr15) |
|---|---|---|---|---|---|---|---|
| Material Grade | CuZn25Al6Fe3Mn3 | CuZn25Al6Fe3Mn3 | CuAl9Fe4Ni4Mn2 | CuSn5Pb5Zn5 | CuSn12 | HT250 | Gcr15 |
| Density | 8.0 | 8.0 | 8.5 | 8.9 | 9.05 | 7.0 | 7.8 |
| Hardness HB | >210 | >250 | >150 | >70 | >80 | >190 | HRC>58 |
| Tensile Strength N/mm² | >750 | >800 | >800 | >200 | >260 | >250 | >1500 |
| Elongation % | >12 | >8 | >15 | >10 | >8 | >5 | >15 |
| Linear Expansion Coefficient 10⁻⁵/°C | 1.9 | 1.9 | 1.9 | 1.8 | 1.8 | 1.0 | 1.1 |
| Operating Temperature °C | -40~+300 | -40~+150 | -40~+400 | -40~+400 | -40~+400 | -40~+400 | -40~+400 |
| Maximum Dynamic Load N/mm² | 100 | 120 | 150 | 60 | 70 | 90 | 200 |
| Maximum Linear Speed m/min (Dry) | 15 | 15 | 20 | 10 | 10 | 8 | 5 |
| Max. PV Value N/mm²*m/min | 200 | 200 | 60 | 60 | 80 | 40 | 150 |
| Compressive Permanent
Deformation 300N/mm² |
<0.01 | <0.005 | <0.04 | <0.05 | <0.005 | <0.015 | <0.002 |
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Bronze bearings utilize various groove patterns to optimize lubrication distribution, load capacity, and wear resistance. These grooves vary in design complexity and application suitability, with specialized patterns addressing specific operational demands.
Standard Groove Patterns
Straight Grooves
Parallel grooves along the bearing axis provide simple, effective lubrication for linear or oscillating motion. Ideal for moderate loads and speeds, they balance performance with ease of manufacturing.
Circular Grooves
Concentric rings perpendicular to the axis retain lubricant effectively, making them suitable for oscillating movements and low-to-moderate speeds.
Straight & Circular Combination
This hybrid pattern adapts to variable loads by combining lubrication distribution (circular) with high-load support (straight).
Spiral Grooves
Helical designs ensure even lubricant spread across rotating surfaces while directing debris away from contact zones. Preferred for high-speed rotational applications.
Specialized Groove Requirements
| Pattern | Design Features | Applications |
|---|---|---|
| Elliptical | Oval-shaped grooves for uniform lubricant distribution under variable loads | Systems requiring pressure-fed lubrication or variable-direction loading4 |
| Figure 8 | Two intersecting circular grooves forming an “8” shape | High-load scenarios with combined rotational/oscillating motion. |
| Double Elliptical | Overlapping oval grooves creating enhanced lubricant retention | Heavy-duty applications with complex load patterns4 |
| Double Figure 8 | Dual intersecting figure-8 patterns for maximum load distribution | Extreme-load environments and harsh operating conditions. |
| Half Figure 8 | Partial figure-8 groove (open on one side) for asymmetric lubrication | Applications with space constraints or unilateral loading requirements. |
Specialized patterns like double figure-8 and elliptical grooves typically require custom manufacturing. The choice depends on:
- Load magnitude/direction
- Operational speed
- Lubrication method (oil vs. grease)
- Motion type (rotary, oscillating, or combined)
For demanding applications, materials like RG7 bronze (C93200) with 7-15% lead content enhance performance through improved machinability and wear resistance. Modern designs increasingly incorporate graphite-filled grooves for self-lubricating capabilities in high-temperature environments.
Groove Design and Application Chart for Bronze Bearings
This chart summarizes the common groove designs for bronze bearings, helping to select the optimal pattern based on the specific mechanical requirements of the application. 
| Groove Type | Groove Design / Description | Recommended Application / Motion Type | Suitable Lubricant |
| Axial | Straight groove(s) parallel to the bearing axis. Can be open or closed at the ends. | Rotational Motion: Ideal for distributing lubricant along the length of shorter bearings. | Oil or Grease |
| Circumferential | One or more continuous rings around the inner circumference of the bearing. | Continuous, High-Speed Rotation: Excellent for providing a constant film of lubricant from an oil feed. | Primarily Oil |
| Helical (Spiral) | A continuous spiral groove, like a screw thread. Can be right-hand or left-hand. | Continuous Rotation: Combines axial and circumferential flow, effectively distributing lubricant across the entire bearing surface. | Primarily Oil |
| Oval (Single Loop) | A single, closed, elongated loop in the center of the bearing. | Oscillating Motion or Low-Speed Rotation: Retains lubricant in a central reservoir that is spread by the rocking motion. | Grease or Oil |
| Double Oval | Two overlapping ovals, often forming a “peanut” or “spectacle” shape. | Oscillating Motion: Provides better lubricant distribution than a single oval, especially for shafts with a wider angle of oscillation. | Grease or Oil |
| Figure of Eight | A continuous groove shaped like the number “8”. | Reciprocating (Linear) or Wide-Angle Oscillating Motion: Ensures lubricant is constantly swept across the load-bearing surface. | Grease or Oil |
| One and a Half Figure of Eight | A figure of eight with an additional single loop attached. | Complex Oscillating Motion: For applications where a standard figure of eight pattern does not provide sufficient coverage. | Grease or Oil |
| Double Figure of Eight | Two intertwined or overlapping figure-of-eight patterns. | Large or High-Load Reciprocating Bearings: Significantly enhances lubricant distribution over a large surface area. | Grease or Oil |
| Duplex Figure of Eight | Two separate figure-of-eight patterns side-by-side. | Heavy-Duty, High-Load Applications: Maximizes lubrication coverage for the most demanding reciprocating or oscillating conditions. | Grease or Oil |
Graphite-Impregnated Bronze Bearing Bushing Applications，spherical plain bearing
Graphite-plugged bronze bushings are ideal for industrial applications that need durable, maintenance-free, high-performance components. Their self-lubricating nature, broad temperature range, and excellent wear resistance improve machinery efficiency and lifespan. When choosing a bushing, assess your application’s specific requirements and consider custom-made options if standard sizes don’t meet your needs.
- Bronze bearings with solid lubricant plugs are used in a variety of industries and applications, including:
- Paper Production: Used in paper machine rollers and drying cylinders, where they help reduce friction and ensure smooth operation under high loads and temperatures.
- Heavy Machinery: Ideal for construction equipment, mining machinery, and other heavy-duty applications where high wear resistance and low maintenance are critical.
- Marine Applications: Their corrosion resistance makes them suitable for use in ship components and offshore installations, where exposure to seawater is a concern.
- Hydraulic Systems: Effective in hydraulic machinery where reliability and performance under pressure are essential.
