CAT 133-8929 BEARING

CAT 133-8929 is a single-row cylindrical roller bearing for Caterpillar engineering machinery, suitable for high-speed, heavy-duty rotating parts in transmission systems and working devices. The following is raw data only, excluding replacement parts information for Cat®…

Core Technical Parameters (Raw Data)

Item Details
Basic Attributes Model 133-8929, Type Single Row Cylindrical Roller Bearing (NU type, inner ring without flange), Material Chromium-Molybdenum Alloy Steel (4140), Single Weight 4.85 kg (10.69 lbs), Operating Temperature -40℃ to +150℃, Dynamic Rated Load Cr≥380 kN, Static Rated Load Cor≥420 kN, Surface Treatment Carburizing and Quenching + Polishing, Corrosion Resistance ≥120 hours Salt Spray, Hardness HRC 60-64, Elastic Modulus 206 GPa, Coefficient of Thermal Expansion 11.7×10^-6/℃
Key Dimensions (Metric / Imperial) Inner Diameter 88.9 mm (3.500 in), Outer Diameter 146.05 mm (5.750 in), Width 36.51 mm (1.4375 in), Roller Diameter 12.7 mm, number of rollers 20, inner diameter tolerance +0.010/-0.005 mm, outer diameter tolerance +0.020/-0.010 mm, width tolerance +0.12/-0.08 mm, roundness ≤0.010 mm, surface roughness Ra≤0.4 μm

Performance Parameters: Fitting shaft diameter 88.9 mm (k6 tolerance), fitting bore diameter 146.05 mm (H7 tolerance), radial clearance 0.03-0.05 mm, maximum permissible speed 3200 rpm (grease lubrication)/4500 rpm (oil lubrication), coefficient of friction ≤0.002, temperature rise at limiting speed ≤45℃, rated life ≥12000 hours (standard operating conditions)

Structure and Fitting Characteristics: Flangeless inner ring design: NU The Cat® structure accommodates bidirectional axial displacement of the shaft, compensating for installation misalignment and thermal expansion. It is suitable for high-speed rotating drive shafts, gearbox output shafts, and other components.

High-precision roller assembly: The rollers feature a full-complement design with a large contact area and strong radial load capacity, suitable for continuous rotation under heavy-duty conditions, reducing vibration and noise.

Reinforced sealing system: Two-sided contact nitrile rubber (NBR) seals with an IP54 protection rating prevent dust and moisture intrusion, suitable for dusty and humid operating environments.

Compatible models and applications:

Bulldozers: D8T, D9T, etc., gearbox output shaft, drive axle differential shaft, suitable for heavy-duty traction.

Loaders: 982M, 988K, etc., boom cylinder drive shaft, gearbox input shaft, suitable for frequent start-stop and heavy-duty operations.

Excavators: 349D2, 390F, etc., swing motor output shaft, travel reducer input shaft, suitable for high-speed rotation and impact load conditions.