MG-5 SL cast bronze bearing with graphite insertions is a self-lubricating bearing made from a high-strength cast bronze alloy, embedded with solid graphite plugs. This design is engineered for low-speed, heavy-duty applications where external lubrication is difficult or impossible. The graphite provides continuous, maintenance-free lubrication, while the bronze matrix offers excellent load capacity, wear resistance, and corrosion resistance. Suitable for high-temperature, underwater, or harsh environments in industries such as automotive, water treatment, and plastic molding.
◆ Features
● Self-Lubricating Operation – Solid graphite plugs provide continuous lubrication without external oil or grease, eliminating maintenance schedules and contamination risks.
● High Load Capacity – Cast bronze matrix offers excellent static and dynamic load capability, ideal for heavy-duty, low-speed applications.
● Corrosion Resistance – Bronze alloy provides inherent resistance to moisture, seawater, and many chemicals.
● High-Temperature Performance – Graphite lubrication remains effective at elevated temperatures where conventional lubricants fail.
● Underwater & Harsh Environment Compatibility – Suitable for submerged or dusty conditions where external lubrication is impractical.
● Maintenance-Free – No relubrication required over extended service life, reducing downtime and operating costs.
◆ Material Structure
MG-5 SL bearings consist of a high-strength cast bronze alloy body with solid graphite plugs inserted at strategic locations across the bearing surface.
1. Cast bronze matrix – Typically phosphor bronze (CuSn8P) or aluminum bronze (CuAl10Fe3), providing high strength, wear resistance, and corrosion resistance. Hardness: 80–120 HB.
2. Graphite plugs (solid insertions) – High-purity graphite embedded in drilled or cast-in holes, serving as solid lubricant reservoirs. Graphite content typically 15–25% of bearing surface area.
◆ Technical Data
| Technical Data – MG-5 SL Cast Bronze with Graphite Insertions | |
| Max. static load | 250–300 N/mm² |
| Max. dynamic load (low speed) | 100–140 N/mm² |
| Max. operating temperature | 400°C (graphite remains effective) |
| Min. operating temperature | -100°C |
| Friction coefficient (dry / graphite film) | 0.08–0.15 |
| Max. continuous speed | 0.5–1.0 m/s (depending on load) |
| PV limit | 1.0–1.5 N/mm²·m/s |
| Hardness (bronze matrix) | 80–120 HB |
| Thermal conductivity | 50–60 W/(m·K) |
| Density | 8.7–8.9 g/cm³ |
◆ Application Areas
MG-5 SL bearings are ideal for low-speed, heavy-duty applications where external lubrication is impractical. Typical industries and equipment include:
● Automotive Industry – Suspension bushings, steering linkages, engine components.
● Water & Marine Equipment – Submerged bearings for pumps, propellers, rudders, sluice gates.
● Plastic Molding Machinery – Injection molding machine toggle joints, dry-running bushings.
● Steel & Rolling Mills – Guide rollers, furnace conveyors, high-temperature bearings.
● Food Processing Equipment – Lubrication-free bearings to prevent contamination.
● High-Temperature Ovens & Kilns – Conveyor bearings operating at 300–400°C.
◆ Available Forms
MG-5 SL bearings are available in various configurations:
● Cylindrical bushings (plain or flanged)
● Thrust washers and wear plates
● Custom cast blanks for machining to specific dimensions
● Custom graphite pattern layouts (grid, diamond, or axial grooves filled with graphite)
● Solid bars and tubes for customer fabrication
