High-Strength Self-Lubricating Graphite Bushings from China Suppliers - Oilless Bronze Bearings Factory
Product Introduction
SPB Solid Lubricated Bearings are engineered with high-strength brass or tin bronze base materials that simultaneously facilitate smooth linear motion and transmit torque in rotary motion. Their key advantage lies in a uniquely compact and space-saving design, which facilitates integration into applications with severe spatial constraints. Engineered for exceptional rigidity and minimal runout, these bearings deliver outstanding positional accuracy and load capacity, ensuring reliable operation even at high speeds and under demanding conditions. Furthermore, the design incorporates external lubrication ports for both rotating and linear sections, significantly simplifying maintenance, reducing downtime, and extending service life. This combination of precision, durability, and ease of use makes SPB bearings a versatile and robust solution for a wide range of industries, from advanced robotics and automotive manufacturing to aerospace systems.
Features
SPB bearings feature high strength, high hardness, and exceptional load-bearing capacity.
SPB high load capacity makes them suitable for heavy-duty applications such as construction machinery and mining equipment.
SPB bearings offer wear and corrosion resistance, with excellent resistance to media including acids, alkalis, and seawater.
SPB bearings deliver superior shock absorption performance, ideal for high-frequency vibration or impact load conditions.
SPB bearings suitable for environments where refueling is not possible, high temperatures, vacuum, or pollution-sensitive — built to withstand harsh operating conditions.
SPB bearings have low friction coefficients as low as 0.16 and enhanced wear resistance, improving equipment operational accuracy.
Application
SPB bearings are suitable for construction machinery such as excavator shafts, Punch Forging Machinery and crusher bushings, Ships and marine equipment: propeller bearings, deck machinery.
Parameters
| Parameter | Value |
|---|---|
| Material | CuZn25Al5Mn4Fe3 |
| Density | 8 g/cm³ |
| Abrasion Coefficient | 0.03 ~ 0.20 |
| Tensile Strength | >750 N/mm² |
| Yield Strength | >340 N/mm² |
| Hardness | >210 HB |
| Max Dynamic Load | 98 N/mm² |
| Max Speed | Dry Lubrication: 0.3 m/s | Oil Lubrication: 1.0 m/s |
| Friction — Oil Lubrication | 0.03 ~ 0.08 |
| Friction — Dry Lubrication | 0.12 ~ 0.16 |
| Working Temperature | -40 ~ +300 °C |
Frequently Asked Questions
SPB bearings are manufactured using high-strength brass or tin bronze base materials, specifically the alloy CuZn25Al5Mn4Fe3. These materials provide excellent mechanical properties including a tensile strength exceeding 750 N/mm² and hardness greater than 210 HB.
SPB bearings can reliably operate across a wide temperature range from -40°C to +300°C, making them suitable for both extreme cold environments and high-temperature industrial applications.
Yes. SPB bearings support dry (self) lubrication with a maximum speed of 0.3 m/s and a friction coefficient between 0.12 and 0.16. This makes them ideal for environments where regular re-lubrication is impractical, such as in sealed systems, vacuum, or contamination-sensitive applications.
SPB bearings are widely applied in construction machinery (excavator shafts, punch forging machinery, crusher bushings), marine equipment (propeller bearings, deck machinery), as well as advanced robotics, automotive manufacturing, mining equipment, and aerospace systems.
SPB bearings offer excellent corrosion resistance and can withstand exposure to aggressive media including acids, alkalis, and seawater. This makes them a reliable choice for marine and chemically demanding industrial environments.
SPB bearings support a maximum dynamic load of 98 N/mm². Combined with their high hardness and tensile strength, this makes them well-suited for heavy-duty applications subject to high loads, shock, and impact forces.