CAT 327-4012 35mm Inner Diameter Drive Axle Bearing

CAT 327-4012 is a Caterpillar genuine single-row tapered roller bearing, suitable for drive axle differentials and other transmission components. The following are precise original specifications and application information, excluding replacement parts (Cat®…).

Core Technical Parameters

Item Details
Part Model: CAT 327-4012 (Single Row Tapered Roller Bearing)

Product Type: Single row tapered roller bearing with stamped steel cage, suitable for medium-load transmission conditions such as drive axle differentials

Material: Rings and rolling elements are made of AISI 52100 high-carbon chromium bearing steel, hardened to 60–64 HRC; cage is made of stamped steel, galvanized for corrosion protection.

Key Dimensions: Inner diameter 35 mm (1.378 in), outer diameter 72 mm (2.835 in), width 20 mm (0.787 in), cone angle 10°, fillet radius r=1.5 mm

Rated Parameters: Radial rated dynamic load 48.5 kN, radial rated static load 55.0 kN; suitable pressure ≤ 25 MPa, operating temperature -30℃ ~ +120℃, limiting speed 6000 rpm (grease lubrication)

Unit Weight: Approx. 0.32 kg (0.705 lbs)

Lubrication Compatibility: Compatible with extreme pressure lithium-based grease (NLGI 2), compatible with drive axle oil bath lubrication.

Tolerance Standards: Inner diameter tolerance P6, outer diameter tolerance P6, surface roughness Ra ≤ 0.4 μm

Structure and Core Characteristics:

Tapered Roller Structure: AISI 52100 bearing steel, hardened. The tapered rollers can simultaneously withstand radial and unidirectional axial loads, suitable for the combined stress conditions of drive axle differentials.

Medium-Load Transmission Compatibility: 20 mm width design, balancing load-bearing capacity and installation space, suitable for the medium-load transmission needs of small and medium-sized equipment drive axles, and can absorb transmission shock.

Stamped Steel Cage: High strength and lightweight, suitable for medium and high-speed conditions, preventing roller jamming and improving operational stability.

Oil Bath Lubrication Compatibility: Compatible with drive axle oil bath lubrication, and can also be supplemented with extreme pressure lithium-based grease to ensure lubrication effect and extend bearing life.

Compatible Models and Application Scenarios

Compatible Equipment: Drive axle differentials, wheel-side reducers, and other components of CAT mini loaders, excavators, and other similar machines.

Core Purpose: Provides radial and unidirectional axial support, transmits power, adapts to medium-load drive axle transmission conditions, and ensures stable operation of the transmission system during equipment travel and operation.