C86300 / CuZn25Al5Mn4Fe3 High Tensile Brass Bearing with Graphite for Lock Gate Mechanisms

Heavy-Duty Self-Lubricating Bearing Solution for Lock Gates

Lock gate mechanisms operate under extreme loads, low speeds, oscillating motion, and harsh wet environments. Conventional lubricated bushings often fail due to grease washout, corrosion, or maintenance neglect.

C86300 / CuZn25Al5Mn4Fe3 high tensile brass bearings with graphite solid lubrication provide a proven, maintenance-reduced solution for hydraulic gates, canal locks, sluice systems, and flood control structures.

Material Overview: ASTM B505 C86300

C86300 (also known as CuZn25Al5Mn4Fe3 manganese bronze) is a high-strength copper-based alloy designed for severe load applications.

Key Properties

• Tensile strength: up to 680–750 MPa

• High yield strength and hardness (approx. 180–220 HB)

• Excellent wear resistance

• Good corrosion resistance in water and marine environments

• Suitable for heavy load, low-speed sliding conditions

When combined with embedded graphite solid lubricant plugs, the bearing achieves:

• Low friction coefficient (approx. 0.05–0.12)

• Dry-running capability

• Reduced maintenance requirements

• Improved anti-seizure performance

Area of Use in Lock Gate Mechanisms

1. Main Hinge & Pivot Bushings

Application Conditions:

• Carry full gate weight

• Subjected to hydrostatic pressure and impact loads

• Oscillating rotation during opening/closing

• Difficult lubrication access

Why C86300 with Graphite?

• High compressive strength prevents deformation

• Solid lubrication maintains performance without grease

• Corrosion resistance ensures long service life in wet or saline conditions

Recommended Design:

• Flanged graphite-plugged bushings

• Extended bearing length to reduce surface pressure

• Stainless steel shaft pairing for optimal wear balance

2. Gate Guide & Slide Bushings

Application Conditions:

• Linear sliding motion

• Side loads from water pressure

• Mud, sand, and debris exposure

Material Advantage:

• Graphite plugs maintain lubrication even under contaminated conditions

• Bronze matrix resists abrasive wear better than standard brass

• Stable performance under boundary lubrication

Typical Configuration:

• Straight cylindrical bushings

• Customized graphite distribution pattern (15–30% contact surface coverage)

3. Seal End & Actuator Pivot Points

Application Conditions:

• Low-speed rotation

• Contact with sealing components

• Moisture exposure

Performance Benefits:

• Reduced friction prevents seal damage

• Anti-galling behavior protects mating shafts

• Reliable operation during long idle periods

Engineering Selection Guidelines

Why Choose C86300 Instead of Standard Bronze or Polymer?

Compared to Standard Bronze:

• Higher strength and load capacity

• Better resistance to impact and deformation

• More suitable for large-diameter hinge systems

Compared to Engineering Plastics:

• No creep deformation under heavy load

• Better dimensional stability in temperature variations

• Higher shock resistance

Manufacturing & Customization Options

• Straight bushings

• Flanged bushings

• Wear plates

• Custom oversized castings for large gate pivots

• CNC machined to tight tolerances

• Graphite plug layout optimized per load direction

Performance Advantages for Hydraulic Infrastructure

Using C86300 graphite-plugged bearings in lock gates provides:

• Extended service life

• Reduced maintenance cost

• Improved operational reliability

• Resistance to corrosion and washout

• Stable performance in submerged or tidal conditions

Conclusion

For heavy-duty lock gate hinge systems, guide rails, and pivot assemblies, C86300 / CuZn25Al5Mn4Fe3 high tensile brass bearings with graphite solid lubrication deliver a robust, low-maintenance, and corrosion-resistant solution.

If you require a custom engineering solution, including load calculation support, graphite layout design, and material optimization for hydraulic gate projects, a tailored design approach ensures maximum performance and long-term reliability.