45# Steel Backed High-Strength Brass Graphite Self-Lubricating Bushing

45# Steel Backed High-Strength Brass Graphite Self-Lubricating Bushing

Heavy Load | High Temperature | Maintenance-Free Sliding Bearing

Product Overview

The 45# steel backed high-strength brass graphite bushing is a heavy-duty bimetal self-lubricating bearing engineered for extreme load, shock, and high-temperature environments.

It combines:

• 45# carbon steel backing – high mechanical strength and structural rigidity

• High-strength brass working layer – superior wear and anti-seizure performance

• Solid graphite inserts – permanent lubrication without oil supply

This design ensures stable operation under low-speed, heavy-load, and intermittent motion conditions, where traditional lubricated bronze bushings often fail.

Structural Design & Working Principle

1️⃣ Bimetal Composite Construction

2️⃣ How It Works

Under load, graphite forms a transfer lubrication film on the shaft surface.
Even at elevated temperatures (up to 400°C), lubrication remains effective without oil supply.

This makes it ideal for:

• Dusty environments

• High-temperature zones

• Hard-to-maintain machinery

• Heavy shock applications

Technical Specifications (Typical Values)

Actual performance depends on alloy grade, shaft hardness (recommended HRC ≥ 50), and installation accuracy.

Key Advantages

✔ High Load Capacity

Steel backing absorbs shock and distributes stress evenly.

✔ High Temperature Resistance

Performs reliably where grease-based lubrication carbonizes or fails.

✔ Maintenance-Free Operation

No continuous oil supply required.

✔ Long Service Life

Reduces downtime and total lifecycle cost.

✔ Anti-Seizure Performance

Ideal for start-stop and boundary lubrication conditions.

Comparison with Conventional Bearings

Conclusion:
For heavy industrial duty, solid-lubricant bimetal bushings provide superior long-term ROI.

Typical Industrial Applications

• Metallurgical equipment (continuous casting machines)

• Construction machinery (excavator arms, bush joints)

• Injection molding machines

• Heavy-duty molds and die guide systems

• Port cranes and lifting equipment

• Furnace and high-temperature conveyors

Engineering Selection Guide

To maximize performance:

1. Shaft hardness ≥ HRC50

2. Surface roughness ≤ Ra 0.8 μm

3. Proper clearance: 0.1–0.15% of shaft diameter

4. Interference fit installation recommended

5. Consider thermal expansion in high-temperature design

• Bimetal graphite bushing

• 45# steel backed bronze bearing

• High strength brass sleeve bearing

• Self lubricating heavy duty bushing

• High temperature sliding bearing

• Maintenance free bronze bush

Why Choose This Bearing Solution?

If your equipment operates under:

• Heavy shock loads

• Low-speed high-pressure motion

• High temperature environments

• Limited lubrication conditions

This graphite plugged bimetal bushing provides a technically robust and economically sustainable solution.