Oilless Bearings services
High-Strength Casting Bronze Bushings solutions | Wear-Resistant Plain Bearings
Casting Bronze Bushing, 2.1090 DIN
OEM casting bronze bushing manufacturer supplying both centrifugal cast and continuous cast solutions for heavy-duty mechanical applications.
European equivalent grade: CuSn7Zn4Pb7-C copper-tin-lead alloy.
Corresponding standard designation: 2.1090.03.
The most widely used grade in this category is CuSn7Zn4Pb7 (CC493K), commonly referred to as Rg7 or gunmetal bronze, known for its balanced strength, machinability, and wear resistance.
Product Series Overview – Casting Bronze Bushing
Casting Bronze Bushing Manufacturer | Heavy-Duty Industrial Bearings
Our Casting Bronze Bushing range covers standard and customized solutions designed for diverse industrial applications. Based on our product and custom manufacturing capabilities, the main series include:
- Standard Casting Bronze Bushings: Cylindrical bronze sleeves manufactured in a wide selection of standard inner and outer diameters. These bushings are widely used in rotating and sliding assemblies requiring reliable wear resistance and load support.
- Flanged Casting Bronze Bushings: Flanged designs provide additional axial positioning and prevent lateral movement during operation. Ideal for applications where precise shaft location and thrust control are required.
- Graphite Plugged Casting Bronze Bushings: Self-lubricating bushings featuring embedded solid lubricant plugs (graphite). This design reduces maintenance requirements and enables operation under limited or no external lubrication, especially in heavy-load or low-speed conditions.
- Custom Cast Bronze Bushings: Non-standard sizes, special geometries, and application-specific designs manufactured precisely according to customer drawings. Custom options include oil grooves, lubrication holes, special alloys, and precision CNC machining to meet exact performance requirements.
OEM casting bronze bushing manufacturer offering centrifugal and continuous cast solutions for demanding mechanical applications.
Large diameter cast bronze plain bearing sleeve
Industrial Casting Bronze Bushings – OEM & Custom Sizes Available
Casting bronze bushings offer excellent versatility for medium to heavy loads, shock impact, and elevated temperatures.
Manufactured primarily from C93200 (SAE 660 bearing bronze), these bushings provide strong wear resistance, impact strength, corrosion protection, and reliable anti-friction performance. Their good machinability ensures precise tolerances and smooth surface finishes for long service life.
We supply multiple alloy grades and custom options, including oil grooves, lubrication holes, graphite inserts, and CNC machining, suitable for injection molding machines, construction equipment, and mining machinery. Fast quotation and prompt delivery support efficient project execution.
Custom Cast Bronze Bushings | Wear-Resistant Plain Bearings
Casting Bronze Bushing – Reliable Performance, Simple Solutions
We supply high-quality casting bronze bushing products with performance-based pricing and dependable service. Our range covers various sizes and specifications, delivering durable, easy-to-use solutions for demanding industrial applications.
Our casting capabilities include continuous casting and centrifugal casting, ensuring dense structure, consistent quality, and long service life.
Bronze remains the preferred material for casting bronze bushings due to its strength, versatility, and excellent resistance to shock, wear, and corrosion. We manufacture phosphor bronze, aluminum bronze, and silicon bronze bushings tailored to your application requirements.
-
C90300 / C90500 (Tin Bronze): Good casting performance and balanced mechanical properties.
-
C93200 / C93700 (High-Leaded Tin Bronze): Excellent wear resistance and embedability; ideal for heavy-duty bushings.
-
C95500 (Nickel Aluminum Bronze): High strength with superior corrosion and erosion resistance for extreme environments.
-
C86300 (Manganese Bronze): Very high strength, suitable for high-impact and heavy-load conditions.
Choose the right casting bronze bushing material to match your product performance and operating environment.
Custom machined casting bronze bushing with oil grooves
CuSn7Zn4Pb7 (CC493K) Casting Bronze Bushing
Bronze Solutions for Custom Continuous Cast Bearings
We supply CuSn7Zn4Pb7 (CC493K) casting bronze bushings for precision applications requiring reliable sliding performance and stable mechanical properties. For custom fabrication, our continuous cast bronze inventory includes sleeves, flanged bushings, thrust washers, shims, and sliding plates in multiple standard sizes.
Customize Your Size & Material
Continuous casting provides dense structure, consistent quality, and an excellent price-to-performance ratio compared with other production methods.
The most widely used alloy is CuSn7Zn4Pb7 (also known as Rg7 or gunmetal). It offers:
-
Good sliding and dry-running capability
-
Reliable wear resistance
-
Excellent machinability for tight tolerances
For higher hardness and improved wear resistance, CuSn12 is recommended. It performs well at higher sliding speeds and provides strong corrosion resistance, including suitability for seawater environments.
We offer a full range of sizes and additional bronze alloys upon request to meet your specific design and operating requirements.
Suggested Searches: Copper， Brass， Bronze， Copper Nickel， Manganese， Aluminum
Centrifugal & Continuous Cast Bronze Bushing Supplier
Continuous or Centrifugal Casting Bronze Bushing
Casting bronze bushings are designed to reduce friction and withstand heavy loads. Compared with plastics or other metals, bronze offers superior wear resistance, strength, and sliding performance in demanding industrial applications.
Bronze bushings are produced using either continuous casting or centrifugal casting. Both processes refine the grain structure and improve mechanical properties. After casting, the bronze bar or tube is precision machined by CNC equipment into the final bushing. The finished product delivers high compressive strength, durability, and resistance to wear and elevated temperatures.
Continuous cast bronze bushings are ideal for cost-effective production and standard industrial applications.
Centrifugal cast bronze bushings are recommended for critical, heavy-duty, and high-load conditions, such as crushers, large shafts, and impact environments, where longer service life and higher reliability are required.
Capabilities & Service – Casting Bronze Bushing
Custom Manufacturing to Drawing
We produce custom cast bronze bushings strictly based on customer drawings, including non-standard sizes, tight tolerances, and complex shapes. Accurate machining and fast turnaround help minimize downtime and keep projects on schedule.
From Prototype to Mass Production
Our flexible system supports small-batch prototyping, sample testing, and full-scale production. This ensures smooth design validation and stable volume supply with consistent quality.
Quality Control & Reliable Delivery
We guarantee stable quality and dependable lead times, supported by material certificates, inspection reports, strict dimensional control, production updates, and coordinated logistics for on-time delivery.
Grooved Bronze Bushings | Upgrade Your Equipment Today
Our casting bronze bushings with oil grooves are engineered for reliable, long-term performance in demanding applications.
- Precision Machining: Produced to strict tolerances for accurate fit and stable operation.
- High Strength & Wear Resistance: Cast bronze structure ensures excellent load capacity and durability.
- Custom Manufacturing: Sizes, groove patterns, and materials can be tailored to your requirements.
- Technical Assistance: Professional support to help you select the right casting bronze bushing for your project.
Designed to reduce friction and extend service life, our casting bronze bushings are widely used in manufacturing equipment, construction machinery, and renewable energy systems. They provide consistent lubrication performance while lowering wear and maintenance costs.
Performance Customization Services – Casting Bronze Bushing
To satisfy demanding industrial conditions, casting bronze bushings can be engineered with advanced performance enhancements. These customization options improve lubrication efficiency, minimize maintenance, and extend operating life under heavy loads and harsh environments.
Groove Design (Oil & Grease Groove Patterns)
Precision-machined groove patterns on the inner surface of the bronze bushing optimize lubricant distribution and retention. Proper groove design ensures consistent lubrication during startup and operation, particularly under boundary lubrication conditions.
Common Groove Types:
-
Straight axial grooves
-
Spiral grooves
-
Figure-eight grooves
-
Cross or diamond patterns
-
Circular oil pockets
Benefits:
-
Improved grease retention
-
Faster lubricant distribution
-
Reduced start-up friction
-
Lower operating temperatures
-
Extended wear life
Groove geometry can be tailored according to shaft speed, load intensity, and lubrication method, including manual greasing, automatic lubrication systems, or initial pre-lubrication only.
Solid Lubricant Integration
For applications where conventional lubrication is difficult or impractical, solid lubricant technologies significantly enhance casting bronze bushing performance.
1️⃣ Graphite Plugging (Embedded Solid Lubricant)
Graphite plugs are inserted into the working surface of the bronze bushing. During operation, graphite forms a continuous lubricating film between the shaft and bearing surface.
Advantages:
-
Self-lubricating performance
-
Maintenance-free operation
-
Suitable for low-speed, high-load conditions
-
Reliable in dusty or inaccessible environments
-
Reduced risk of seizure under shock loads
This solution is widely used in heavy-duty systems such as mining and construction machinery.
2️⃣ Graphite Impregnation (Graphite-Integrated Bronze)
In this process, fine graphite particles are distributed uniformly throughout the bronze matrix during casting or through secondary treatment. Unlike plug-in designs, lubrication is integrated into the entire material structure.
Advantages:
-
Uniform self-lubricating properties
-
Enhanced wear resistance
-
Stable performance at elevated temperatures
-
Suitable for continuous-duty operation
-
Lower coefficient of friction
Graphite-impregnated bronze is preferred for applications requiring consistent lubrication across the full bearing surface.
Casting Bronze Bushing Applications
- Heavy-Duty Equipment
Casting bronze bushings offer high hardness and strong impact resistance, making them ideal for construction, agricultural, and industrial machinery operating in harsh environments where reliability is critical. - Hydraulic Machinery
Thanks to their heat resistance and excellent mechanical strength, casting bronze bushings are widely used in hydraulic cylinders, pumps, and motors to provide stable load support and extended service life. - Power Transmission Components
In gear systems, couplings, and drive assemblies, casting bronze bushings improve efficiency, reduce friction, and enhance overall performance under continuous load conditions. - Manufacturing Tools and Equipment
The strength and wear resistance of bronze alloys make casting bronze bushings suitable for stamping dies, presses, molds, and other production tooling where precision and durability are essential. - Injection Molding Machines
Casting bronze bushings provide stable guidance and wear resistance in tie bars, clamping units, and moving platens under repeated high-pressure cycles. - Engineering & Mining Machinery
Used in excavators, cone crushers, and heavy mining equipment, casting bronze bushings withstand extreme loads, vibration, and abrasive conditions. - Agricultural Machinery
Bronze bushings ensure dependable performance in tractors, harvesters, and other farm equipment exposed to dust, moisture, and fluctuating loads. - Energy & Hydraulic Turbines
In power generation systems and hydraulic turbines, casting bronze bushings deliver corrosion resistance, load capacity, and long-term operational stability. - Food Processing Machinery
Selected bronze grades are applied in food machinery where durability, smooth motion, and reliable wear performance are required. - Mold and Die Industry
As standardized components, casting bronze bushings support alignment, reduce friction, and extend service life in molds and stamping dies.
C93200 (SAE660) Casting Bronze Bushing
Similar or Equivalent Specification
| CDA | ASTM | SAE | AMS | Federal | Other | |
|---|---|---|---|---|---|---|
| C93200 | B505 B505M |
J461 J462 |
QQ-C-390, E7; QQ-B-1005, Comp 12 |
Bearing Bronze |
Chemical Composition
| Cu%1 | Pb% | Sn% | Zn% | Fe% | P% | Ni%1,2 | Al% | S% | Sb% | Si% | |
|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chemical Composition according to ASTM B505/B505M-18
1 In determining Cu min., Cu may be calculated as Cu + Ni. 2Ni value includes Co.
Note: Cu + Sum of Named Elements, 99.0% min. Single values represent maximums.
|
|||||||||||
| 81.00- 85.00 |
6.00- 8.00 |
6.30- 7.50 |
2.00- 4.00 |
0.20 | 1.50 | 1.00 | 0.005 | 0.08 | 0.35 | 0.005 | |
CuSn7Zn4Pb7 Bronze Material, 2.1090 DIN
| EN | DIN | ||||
| Alloy | CuSn7Zn4Pb7-C | CuSn7ZnPb | |||
| RG7 | |||||
| Standard | EN 1982 | DIN 1705 | |||
| Alloy number | CC493K | 2.1090 | |||
| Chemical composition | Mechanical properties | ||||
| Cu | 81,0 – 85,0 | 81,0 – 85,0 | EN | DIN | |
| Sn | 5,4 – 8,0 | 5,6 – 8,0 | Rm | ≥ 260 | ≥ 270 |
| Zn | 2,0 – 5,0 | 3,0 – 5,0 | Rp 0,2 | ≥ 120 | ≥ 120 |
| Pb | 5,0 – 8,0 | 5,0 – 7,0 | A5 | ≥ 12 | ≥ 16 |
| Ni | 2,0 max. | 2,0 max. | HB | ≥ 70 | ≥ 70 |
| P | 0,10 max. | 0,05 max. | |||
| kg/dm³ | 8,9 | ||||
| Condition | GC, GZ | GC | |||
| Characteristics | Most common bronze alloy, also called bearing bronze or gunmetal. Suitable for bronze bearings with medium load, good dry running properties, high wear resistance and machinability. General applications: cylinder and bearing liners, gears and wear strips. Loads up to 4000 N/cm² | ||||
C87850 (ECO Bronze) Casting Bronze Bushings
The C87850 (ECO Bronze) series of cast bronze bushings provide an eco-friendly, lead-free alternative to the C93200 (SAE 600) leaded bronze series. ECO Bronze is a RoHS- and REACH-compliant alloy that has been tested through multiple independent laboratories and confirmed to be free of lead, arsenic, and bismuth. In addition to being environmentally safe and cost-effective, ECO bronze is proven to be equal to or better than traditional alloys in terms of quality and performance. Other beneficial properties of this material include:
- Excellent machinability
- Non-galling
- Lightweight
- Tolerant of high
- temperatures
- Excellent impact and
- compressive strength
- Resistant to dezincification and stress corrosion
- 100% recyclable
- These properties make ECO Bronze cast bronze bushings and thrust washers perfect for meeting the strict safety and/or environmental regulations of the energy, marine, construction, medical, food, and beverage industries.
Mechanical properties of the ECO BRONZE C87850 series include:
- 65,000 psi tensile strength (minimum)
- 25,000 psi yield strength (minimum)
- 8% elongation in 2″ (minimum)
- Brinell Hardness (500 kg load): 103 typical
- Machinability Rating: 70
- Minimum Operating Temperature: -400°F
- Maximum Operating Temperature: 400°F
- P Value Max 4,400
- V Value Max 450
- PV Value Max 100,000
Bushings & Bars offers the following C87850 (ECO Bronze) cast bronze products:
- Sleeve Bushings
- Flanged Bushings
- Thrust Wash
C96900 casting bronze bushing
Industrial
- Mining
- Aerospace
- Automotive
- Heavy equipment
- Off-road
- Oil and gas
- Drilling hardware
Mechanical properties of the C96900 series include:
- 110,000 psi tensile strength
- 105,000 psi yield strength
- 4% elongation
- Rockwell C 32 typical
- Machinability Rating: 8
- Minimum Operating Temperature: -450°F
- Maximum Operating Temperature: 550°F
- P-Value Max 20,000
- V Value Max 500
- PV Value Max 275,000
The series of bushings and thrust washers offer the highest PV rating in the Bushings & Bars catalog. Products include:
- Sleeve Bushings
- Flanged Bushings
- Thrust Washers
Cuzn25al6femn3 Finish Machined Bronze Casting
CuZn25Al6FeMn3 is an aluminum bronze alloy widely used for bronze castings. It consists of approximately 25% zinc, 6% aluminum, and small amounts of iron and manganese. This alloy is renowned for its high strength, corrosion resistance, and excellent machinability.
Centrifugal casting is a preferred method for producing bronze components like rings, bushings, and crowns using this alloy. The centrifugal force during casting creates a dense, fine-grained structure with enhanced physical properties compared to static casting. Impurities and gas pockets are pushed to the center and removed, resulting in a high-quality casting.
After centrifugal casting, the bronze components often undergo finish machining to achieve the desired dimensions and surface finish. This process includes cutting, grinding, and polishing the as-cast parts to tight tolerances, allowing for the production of complex shapes and ensuring dimensional accuracy.
Finish machined CuZn25Al6FeMn3 bronze castings are used in various industries requiring high strength, corrosion resistance, and good machinability. These industries include defense, power generation, glass container manufacturing, and machinery manufacturing.
GzCuZn34Al2 is a specific type of aluminum bronze alloy commonly used in casting applications. This alloy is noted for its excellent corrosion resistance, high strength, and good machinability, making it suitable for various industrial applications.
Properties of GzCuZn34Al2
Composition:
The alloy typically consists of copper (Cu), zinc (Zn), aluminum (Al), and small amounts of other elements, which contribute to its unique properties.
Corrosion Resistance:
GzCuZn34Al2 exhibits superior resistance to corrosion, especially in marine environments, which is a significant advantage for components exposed to harsh conditions.
Machinability:
This alloy is known for its ease of machining, allowing for the production of finely detailed and precise components.
Strength:
It has high tensile strength, making it suitable for applications where mechanical strength is critical.
Applications
GzCuZn34Al2 is widely used in various sectors, including:
Marine Engineering:
Due to its corrosion resistance, it is often utilized in shipbuilding and offshore structures.
Valves and Fittings:
The alloy is commonly used for manufacturing valves, fittings, and other components that require durability and resistance to wear.
Machined Parts:
Finished machined bronze castings made from this alloy are used in various machinery and equipment, providing reliable performance.
Casting Process
The casting of GzCuZn34Al2 typically involves processes such as sand casting or lost wax casting.
Sand Casting:
This method uses a mold made from sand to create the desired shape. After the molten alloy is poured into the mold and allowed to cool, the sand is removed to reveal the casting.
Lost Wax Casting:
This technique involves creating a wax model of the desired object, which is then encased in a mold. The wax is melted away, leaving a cavity into which the molten alloy is poured.
Finishing
Once cast, the components may undergo further machining and finishing processes to achieve the desired surface finish and dimensional accuracy. This may include sanding, polishing, and applying protective coatings to enhance durability and aesthetics.
Summary
GzCuZn34Al2 finished machined bronze castings are valued for their strength, corrosion resistance, and versatility in various applications, particularly in environments where durability is paramount.
Casting Bronze Bushing VS Oil-impregnated Bronze Bushings
- Casting bronze bushing
Casting bronze bushings are machined from C93200 (SAE 660) bronze for superior performance. The continuous casting process ensures a uniform bronze structure throughout the process bearings are free of porosity and hard particle inclusions common to other casting processes. Standard bearing lines are available in over 900 sizes, these standards provide off-the-shelf economy for most applications and may be easily resized, oil grooved, or graphitized to meet special requirements. In addition to standard sleeve (plain) bearings, the following products are available
-Finished bearings
-Grease or oil groove casting bronze bushing
-Graphite-filled groove bearings
-Graphite-filled plug bearings
-Special alloy bearings
- Oil-impregnated bronze bushings
Oil-impregnated bronze bushings are characterized by their ability to self-lubricate. This effect is possible due to the powder metallurgical process:
Bronze powder is gravity-filled into a die of the desired bushing size. The powder is then pressed to bond the powder particles together.
The powder particles in the part are then bonded together in a furnace. The furnace temperature is just high enough to bond the particles together without melting the metal.
This sintering process is the key to oil impregnation. Sintering, by its very nature, reduces the porosity of the product as it bonds the powder particles together, but it is possible to control the degree of this process.
In the case of oil-impregnated bronze bushings, the final porosity is maintained at about 25%, which means that tiny interconnected capillaries are still interwoven throughout the material.
To finish the manufacturing process the bushing is then pressed through a calibration set of tools to the required tolerances. The bushing is then vacuum impregnated which forces oil into the interconnected porosity.
The difference between casting bronze bushing and oil impregnated bronze bushing
Oil-impregnated bushings originated as automotive components, however they are used in many other industries. In general, our oil-impregnated bronze bushings are best suited for low to moderate loads, but they do withstand high speeds better than many alternatives. They also work well over a wide temperature range of approximately 10-220°F, which means they are suitable for use in outdoor and industrial environments.
Unlike oil-impregnated bushings, casting bronze bushings are not formed from powder. Instead, they are formed from solid or hollow cast bronze bars that undergo a machining process designed to achieve a precise final shape. The bronze is continuously or centrifugally cast into solid or hollow bars. Casting bronze bushings do not start out as a powder, so they maintain a finer grain structure and thus have higher strength. In general, casting bronze bushings are also stronger, more durable, and more reliable under compression forces. This combination of properties makes casting bushings ideal for applications involving heavier loads.
