CAT 599-8871 145mm Outer Diameter Straight Sleeve Bearing

CAT 599-8871 is a Caterpillar genuine straight-tube sliding sleeve bearing with an outer diameter of 145 mm, suitable for pivot/pin joints in heavy-duty construction machinery. The following are precise original specifications and application information, excluding replacement parts.

Core Technical Parameters

Item Details
Part Model CAT 599-8871 (Straight-tube sliding sleeve bearing, heavy-duty joint self-lubricating/oil-lubricated bushing)

Product Type Bimetallic composite straight-tube sleeve bearing, steel back + anti-friction alloy layer structure, suitable for low-speed heavy-load, oscillating/reciprocating conditions

Material Steel back: Q235B carbon steel; Anti-friction layer: CuPb10Sn10 lead-tin bronze, surface tin plating 5–8 μm; Steel back thickness: 3 mm; Alloy layer thickness: 1.5 mm

Key Dimensions Outer diameter: 145 mm (5.709 in), Inner diameter: 120 mm (4.724 in), Length: 100 mm (3.937 in), Wall thickness: 12.5 mm, Chamfered ends: 0.5×45°

Rated Parameters Suitable operating temperature: -30℃ ~ +150℃; Rated load pressure: 25 MPa; Suitable linear speed: ≤ 2 m/s, coefficient of friction ≤ 0.08 (oil lubrication)
Physical properties: Density 8.9 g/cm³, elastic modulus 110 GPa, compressive strength 350 MPa, Brinell hardness HB 80–100
Lubrication compatibility: Compatible with SAE 15W-40 machine oil or lithium-based grease (NLGI 2), with oil groove/hole design available (depending on model requirements)
Weight: Approx. 3.2 kg (7.05 lbs)
Compatibility standards: Complies with ISO 4389 sliding bearing standard, tolerances comply with GB/T 12361 precision grade (inner diameter tolerance f7, outer diameter tolerance m6)
Structure and core characteristics: Bimetallic composite structure: steel back provides rigidity and load-bearing capacity, bronze anti-friction layer reduces friction and wear, tin plating layer improves corrosion resistance and break-in performance, suitable for heavy-load impact and vibration conditions.

Precision Dimension Control: Strict tolerances for inner and outer diameters ensure a tight fit with the pins and mounting holes (outer diameter interference 0.05–0.12 mm), preventing slippage or loosening during operation.

Optimized Working Conditions: Suitable for low-speed (≤ 2 m/s), heavy-load (≤ 25 MPa) oscillating/reciprocating motions, such as loader boom pins and excavator stick pins, capable of withstanding radial loads and a certain angle of oscillation.

Long Lifespan Design: The embedded bronze layer accommodates minute impurities, reducing wear on the pins. Under normal maintenance, the service life is ≥ 5000 hours.

Compatible Machines and Application Scenarios

Compatible Equipment: Boom pins, stick pins, connecting rod pins, and other pivot joints in CAT 980H/980K loaders, 336D/349D excavators, D11 bulldozers, etc. Core application: Installed between the pin and structural components, it provides low-friction support, absorbs impact loads, reduces direct wear between the pin and structural components, ensures flexible joint operation, and reduces maintenance frequency.