Graphite Plugged Manganese Bronze Bushings (C86300) – Material & Areas of Use

Graphite Plugged Manganese Bronze Bushings (C86300) – Material & Areas of Use

Graphite Bronze Bushing (C86300 Series)

Self-Lubricating Bearing with Embedded Graphite Solid Lubricants

Description:
Graphite bronze bushings are high-strength copper alloy–based self-lubricating bearings, designed to operate without external lubrication. Solid graphite plugs embedded within the bronze matrix continuously release a microscopic lubricating film during operation, providing excellent load-bearing capacity, wear resistance, and high-temperature performance.

Specifications and tolerances may vary depending on configuration (e.g., plain bushings, flange bushings, thrust plates, or spherical bearings). Please refer to the latest official catalog for detailed dimensions and model variations.

1. Material Composition

2. Mechanical Properties

3. Friction & Lubrication Characteristics

4. Environmental Performance

5. Dimensional and Installation Reference

Standard Forms:

• SPB – Straight Bushings

• SPFG – Flanged Bushings

• SFP – Wear Plates

• Spherical Bearings (customized)

Example Size:

• ID 20 mm × OD 28 mm × Length 20 mm (Tolerance: H7)

Recommended Installation Tolerances:

• Outer Diameter: H7

• Inner Diameter: g6 or h7

Example Plate Thickness:

• 10 mm (customizable)

Additional Notes

• Typical applications: Heavy-load, low-speed, or high-temperature conditions — e.g., rolling mills, construction equipment hinges, die guide bushings, and hydraulic press components.

• Design note: The PV value (Pressure × Velocity) is the key design criterion; calculations should be based on actual operating conditions.

• Technical support: For specific CAD models, test reports, or custom configurations, please contact the manufacturer.

• Reference: VIIPLUS Self-Lubricating Bearing Solutions – www.viiplus.com

Material Overview:
Manganese bronze material C86300 (CuZn25Al5Mn4Fe3 + Graphite) is a high-strength copper alloy embedded with solid graphite lubricants. This structure forms a self-lubricating bearing system that eliminates the need for regular oil or grease lubrication. It is characterized by:

• High load capacity and wear resistance

• Excellent anti-seizure properties under boundary lubrication

• Stable performance from -40°C to 250°C

• Outstanding resistance to corrosion, shock, and abrasive particles

This makes graphite bronze bushings an ideal replacement for traditional brass bushings and roller end bearings in demanding environments — particularly where high loads, slow speeds, or difficult lubrication access exist.

Industry Applications and Typical Installation Areas

1. Metallurgical Industry

In metallurgical equipment, C86300 graphite bronze bushings are used in high-load, high-temperature, and dusty conditions such as:

• Rolling mill backup rolls and support roll bushings

• Continuous casting machine mold guide sleeves

• Ejector and push-rod bearing assemblies

These positions often operate at temperatures up to 250°C, where the solid graphite lubricants create a consistent lubricating film to prevent metal-to-metal adhesion, reduce friction, and ensure long-term continuous operation without maintenance interruptions.

2. Machinery Manufacturing

In heavy-duty and precision machinery, graphite bronze bushings are installed in:

• Press machine and hydraulic press guide bushings

• Gearbox sliding bearings and linkage joints

• Die guide pillars and tool slide sleeves

These locations demand precise alignment and smooth linear or oscillating motion. The self-lubricating feature prevents oil contamination on components or workpieces, improving production efficiency and reducing downtime for maintenance.

3. Energy Equipment (Oil, Gas, and Power Generation)

C86300 bushings are commonly used in high-pressure and high-temperature applications, such as:

• Wind turbine yaw and pitch joints

• Drilling rig swivel and guide mechanisms

• Pump shaft bushings and valve actuator bearings

These bearings perform reliably under abrasive or corrosive conditions, such as offshore or oilfield environments. The graphite plugs provide a low-friction interface that resists seizure and extends service life, even when lubrication is impossible or infrequent.

4. Railway Industry

Graphite bronze bushings are found in:

• Axle box sliding bearings

• Track switch linkage sleeves

• Brake lever and suspension joints

These critical areas endure vibration, shock loads, and dust exposure. The high-strength manganese bronze matrix offers mechanical stability, while graphite lubrication minimizes wear and prevents galling — crucial for maintaining safety and reliability in both freight and high-speed train systems.

5. Marine & Shipbuilding Industry

In marine conditions characterized by humidity, salt spray, and limited maintenance access, C86300 bushings are used in:

• Rudder and propeller shaft bearings

• Anchor winch and mooring equipment bushings

• Deck crane and hoist pivot joints

The corrosion-resistant bronze combined with graphite lubrication prevents seizing and rusting under saltwater exposure. These bushings support low-speed, heavy-load rotation or oscillation, ensuring smooth and safe operation of ship components.

6. Construction & Heavy Equipment

For mobile machinery and off-road vehicles (excavators, cranes, loaders), the bushings are used in:

• Boom and arm hinge joints

• Telescopic cylinder guide bearings

• Track tension wheel sleeves

These points face extreme loads, impact, and abrasive contaminants (mud, sand, dust). The C86300 material provides superior fatigue strength and wear resistance, reducing lubrication intervals and preventing failure during long-term outdoor operation.

Summary

Manganese Bronze C86300 Graphite Bushings are designed for heavy-duty, maintenance-free service across industries. By combining high mechanical strength with solid graphite lubrication, they:

• Replace conventional lubricated brass or bronze bushings

• Extend service life under harsh conditions

• Operate reliably in wide temperature and load ranges

• Reduce maintenance costs and downtime

Recommended temperature range: -40°C to +250°C
Typical suppliers: Viiplus Self-Lubricating Bearing Solutions (VIIPLUS.COM)