CAT 587-5251 28.6mm Outer Diameter Sleeve Bearing

CAT 587-5251 is a Caterpillar genuine straight-tube sleeve bearing (without flange), with an outer diameter of 28.6 mm. It is suitable for light to medium load rotating parts such as connecting rods and pins in small machinery. The following are precise original specifications and application information, excluding replacement parts.

Core Technical Parameters

Item Details
Part Model CAT 587-5251 (Straight-tube Sleeve Bearing)

Product Type Straight-tube flangeless sleeve bearing, suitable for light to medium loads and low-speed rotation conditions, without internal lubrication grooves and oil holes

Material The bearing rings are made of AISI 1045 carbon steel, with a surface hardening hardness of 58–62 HRC. The inner wall is plated with a copper alloy anti-friction layer, with a thickness of 0.05–0.1 mm.

Key Dimensions Inner diameter 20 mm (0.787 in), outer diameter 28.6 mm (1.126 in), length 25 mm (0.984 in), fillet radius r=0.8 mm

Rated Parameters Radial rated dynamic load 12.5 kN, radial rated static load 18.0 kN; suitable pressure ≤ 15 MPa, operating temperature -20℃ ~ +100℃, linear velocity ≤ 0.5 m/s

Physical Properties Density 7.85 g/cm³, elastic modulus 206 GPa, coefficient of thermal expansion 12.0×10⁻⁶/℃, clearance 0.02–0.04 mm
Single weight approx. 0.09 kg (0.198 lbs)
Lubrication compatibility: Compatible with extreme pressure lithium-based grease (NLGI 2), requires external lubrication system supply via pin/bushing seat
Tolerances: Inner diameter tolerance H7, outer diameter tolerance g6, surface roughness Ra ≤ 0.8 μm
Structure and core characteristics: Straight cylinder without flanges: Suitable for compact installation spaces, easy to assemble with pins, connecting rods, etc., no additional axial positioning structure, relies on assembly clearance and external positioning components for fixation.

Carbon steel base + copper-plated alloy anti-friction layer: The base provides sufficient strength, the anti-friction layer reduces the coefficient of friction and improves wear resistance, suitable for reciprocating or rotary motion under light to medium load conditions.

No internal lubrication grooves: Simple structure, low cost, relies on the overall lubrication system of the equipment for oil supply, avoiding premature wear caused by dry friction.

Surface hardening and strengthening: External wall hardening treatment improves hardness and impact resistance, adapting to the vibration and impact conditions of construction machinery and extending service life.

Compatible Models and Application Scenarios

Compatible Equipment: Boom linkage, bucket pin, pilot valve linkage, and other light to medium load rotating parts of small equipment such as CAT 301.7CR/302.7CR mini excavators and 226B3/242D skid steer loaders.

Core Application: Provides radial support, reduces friction between pins and linkage holes, absorbs minor vibrations, ensures flexible operation and stable running of small machinery, suitable for light-duty working conditions such as municipal and landscaping applications.