500SP Self Lubricating Bushing
500SP Self Lubricating Bushing
500SP Self-Lubricating Bushing: The Ultimate Oil-Free Solution for High-Load Applications
Bearingface.com’s 500SP self-lubricating bushing offers a solution for engineers and procurement specialists designing systems for heavy-duty, low-speed, or maintenance-hostile environments where conventional lubrication is a critical failure point. By embedding solid graphite lubricant in a high-strength brass matrix, the 500SP eliminates the need for oil or grease, ensuring continuous, reliable operation while reducing downtime and total cost of ownership. This self-lubricating bearing operates without external lubrication due to its graphite or solid lubricant composites within a metal alloy. Whether you’re contending with extreme temperatures, heavy loads, or intermittent oscillating motion, our graphite-embedded brass bushings are engineered to outperform traditional bearings.
What is a 500SP Self-Lubricating Bushing?
A 500SP Self-Lubricating Bushing is a composite, oil-free bearing designed for superior performance in demanding applications. The “500SP” designation refers to a specific system where solid lubricants are integrated into a metallic base, offering a robust, maintenance-free bearing solution.
Its construction consists of two primary elements:
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Base Material: A high-strength, cast brass alloy that provides exceptional structural integrity, load-bearing capacity, and corrosion resistance.
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Solid Lubricant: Plugs of Grade 500SP graphite are precisely arranged and embedded into the running surface of the brass base. During operation, a microscopic film of this solid lubricant is transferred to the mating shaft, creating an extremely low-friction, self-lubricating surface.
This design makes the oil free brass graphite bush ideal for applications where fluid lubricants are impractical or could cause contamination.
Technical Deep Dive: The Material Science Behind 500SP Performance
Understanding the materials is key to appreciating the capabilities of the 500SP self lubricating bushing. Our commitment to material excellence ensures predictable, long-lasting performance.
The High-Strength Brass Matrix (Base Material)
The foundation of our 500SP bushings is a specialized brass alloy, chosen for its mechanical properties. While various alloys can be used, we standardize on high-performance grades for maximum reliability.
| Alloy Designation (Typical) | Key Characteristics & Engineering Advantages |
| CuZn25Al6Fe3Mn3 (C86300) | Primary Choice: Known as Manganese Bronze, this alloy offers exceptionally high tensile strength, superior wear resistance, and the ability to withstand heavy shock loads. Its inherent corrosion resistance makes it suitable for marine and harsh industrial environments. |
| CuSn10P (C90500/C93200) | Alternative Option: Tin Bronze offers good load capacity and excellent machinability. It is a reliable choice for moderate-load applications where thermal conductivity is also a consideration. |
Our engineering team can help you select the precise base alloy to match your specific load, speed, and environmental requirements.
The Grade 500SP Graphite Plug Lubricant
The “SP” in 500SP denotes the solid-lubricant plug system. We utilize a proprietary Grade 500SP graphite composition for its outstanding tribological properties.
| Parameter | Specification & Benefit |
| Material | High-purity graphite with specialized binders. This ensures a stable, durable plug that won’t crumble under pressure. |
| Friction Coefficient | 0.04 – 0.20 (dry friction). Creates an ultra-smooth running surface, reducing energy loss and wear. |
| Operating Temperature | -40°C to +300°C (-40°F to +572°F). Maintains lubricating properties in extreme cold and high-heat applications. |
| Thermal Conductivity | High. Effectively dissipates frictional heat away from the running surface, preventing seizure and material degradation. |
Performance Specifications & Operational Advantages
Choosing a 500SP brass graphite bushing translates directly into measurable performance gains and operational efficiencies.
Key Performance Parameters
| Performance Metric | Typical Parameter Range | Impact on Your Application |
| Max. Static Load | ≥ 100 N/mm² | Withstands extreme stationary loads without deformation. Ideal for structural pivots. |
| Max. Dynamic Load | 50 – 70 N/mm² | Handles high-pressure, low-speed oscillating, reciprocating, and rotational movements. |
| Max. Sliding Speed | 0.5 m/s (Dry) | Optimized for low-to-medium speed applications common in heavy machinery. |
| PV Limit (Load x Velocity) | 1.65 N/mm² · m/s | A critical design parameter indicating a robust operational window. |
Core Benefits for Your Application
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100% Maintenance-Free: Eliminates the need for lubrication schedules, grease fittings, and manual labor.
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Superior Wear Resistance: The combination of hard brass and a solid lubricating film significantly extends service life, especially in oscillating motions where oil films can break down.
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High Load & Impact Capacity: The robust brass structure absorbs shock loads that would destroy polymer or standard bronze bearings.
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Wide Temperature Tolerance: Performs reliably in environments from cryogenic to high-heat, where oils and greases would freeze or burn off.
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Contamination-Free Operation: Perfect for food processing, packaging, and mold industries where product purity is essential.
Proven Applications: Where 500SP Brass Graphite Bushings Excel
Our 500SP self lubricating bushings are trusted by industry leaders in the most challenging fields.
| Industry | Typical Application | Why 500SP is the Ideal Choice |
| Heavy & Construction Machinery | Excavator boom joints, pivot pins, hydraulic cylinder ears | Withstands extreme loads, constant oscillation, and exposure to dirt and moisture without needing daily greasing. |
| Metallurgy & Steel Mills | Hot rolling mill guides, furnace door pivots, ladle cars | Resists extreme temperatures and heavy shock loads where liquid lubricants would vaporize or become contaminated. |
| Injection & Die-Casting Molds | Guide pillars, ejector guide pins, slider mechanisms | Provides precise, clean, oil-free movement, preventing product contamination and reducing mold maintenance cycles. |
| Hydraulic & Pneumatic Systems | Cylinder rod guides, trunnion mounts, clevis bearings | Prevents hydraulic fluid contamination from external grease and handles high radial loads and frequent starts/stops. |
| Renewable Energy | Wind turbine yaw systems, solar tracker pivots | Ensures decades of reliable, maintenance-free operation in remote, hard-to-service locations. |
| Port & Mining Equipment | Ship loader pivots, conveyor rollers, crane kingpins | Delivers unparalleled durability in corrosive, abrasive, and high-load environments. |
Available Configurations & Customization
Bearingface.com provides a comprehensive range of 500SP brass graphite bushings to meet standard and custom design needs.
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500SPB (Cylindrical Bushing): Standard straight sleeve bushings for radial loads.
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500SPF (Flanged Bushing): Flanged design for easy mounting and axial positioning.
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500SPW (Thrust Washer & Wear Plate): Flat components for handling axial loads and providing low-friction sliding surfaces.
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Custom Parts: We specialize in manufacturing graphite embedded brass bushings to your exact drawings, including custom sizes, groove patterns, and plug configurations.
Why Choose Bearingface.com for Your 500SP Bushings?
Partner with an expert who understands your technical requirements and supply chain needs.
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Material Certification & Quality Assurance: We provide full material traceability and adhere to strict quality control processes, ensuring every part meets or exceeds industry standards like ASTM and DIN.
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Expert Engineering Support: Our team is ready to assist with material selection, PV value calculations, and custom design consultation to ensure you get the perfect bearing for your application.
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Competitive Lead Times & Global Shipping: We understand project deadlines. Our streamlined production and logistics ensure you get the parts you need, when you need them.
Ready to Eliminate Lubrication and Enhance Durability?
Take the next step toward a more reliable, maintenance-free design. Our team is ready to provide you with a competitive quote and the technical support you need to succeed.
