Maintenance-Free Large Nickel Aluminum Bronze Oilless Bearings

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Product Specifications
Name： Large Aluminum Bronze Self-Lubricating Bushing
Standard： ASTM B505 / B148, UNS C95400 / C95500 / C95800, RoHS Compliant, REACH Compliant
Material： C95400 (Aluminum Bronze), C95500 / C95800 (Nickel Aluminum Bronze) with Embedded Solid Graphite Lubricant
Surface： Precision Machined, Evenly Distributed Graphite Plugs
Inner Diameter (ID)： 100mm – 500mm
Outer Diameter (OD)： 120mm – 600mm
Length： 100mm – 1000mm
Product Features: Maintenance-free operation with solid graphite lubrication · Exceptional load capacity and shock resistance · Superior seawater and chemical corrosion resistance · Excellent wear and galling resistance · High strength and toughness in large sizes · Low friction for smooth operation · Long service life without external oiling
Application Field: Heavy construction and mining machinery, Marine propulsion and offshore platforms, Hydraulic presses and cylinders, Steel mill and rolling equipment, Injection molding machines, Crane and hoist systems, Pump housings in corrosive fluids, Large gearboxes and transmissions

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Large Aluminum Bronze Self-Lubricating Bushing – Process & Quality Assurance Statement
Our large aluminum bronze self-lubricating bushings are built for extreme environments where high loads, corrosion, and maintenance access are constant challenges, delivering reliable performance without the need for ongoing lubrication.

Key process features

Production combines dense casting with precise graphite insertion and machining for consistent quality in oversized components:
●Alloy Casting: Premium ingots are melted and centrifugally cast into thick-walled sleeves, achieving high density and minimal porosity.
●Heat Treatment: Controlled annealing optimizes strength, toughness, and eliminates internal stresses.
●Graphite Plugging: Solid lubricant plugs are machined and press-fitted in optimized patterns across the bearing surface.
●Rough Machining: CNC turning establishes basic dimensions and prepares surfaces for final finishing.
●Precision Finishing: Internal and external diameters are honed or ground to tight tolerances for perfect fit and smooth running.
●Surface Enhancement: Optional anti-galling treatments or break-in coatings applied where specified.
●Cleaning & Preservation: Thorough cleaning removes debris, followed by protective packaging to maintain readiness.

Quality control system

● Complete traceability from ingot heat to finished large bushing
● Material certificates and inspection reports included with every shipment
● Sample retention ≥3 years for third-party testing (SGS, BV, TÜV, etc.)
● 100% inspection of essential parameters:
• Chemical composition (spectrometric analysis)
• Graphite plug distribution and security (dimensional and visual checks)
• Dimensional accuracy (CMM and bore gauges; typical ID tolerance ±0.05mm)
• Surface finish and hardness (profilometer and Rockwell testing)
• Load-bearing performance (sample compression testing per batch)
● Internal standards exceed ASTM B505 requirements. Typical C95800 with graphite: High compressive strength ≥700 MPa, Excellent dry-running capability, Superior resistance to seawater and heavy impact loads.
● ISO 9001:2015 certified manufacturing ensures every large self-lubricating bushing provides dependable, long-term operation in your most demanding heavy-duty applications.