Timken Bearing 34478

Description:

The Timken 34478 is a single tapered roller bearing cup (outer ring) from the Timken 34000 Series. Designed for use with compatible Timken tapered roller bearing cones such as the 34300, 34300A, 34301, or 34304 to form a complete single-row tapered roller bearing assembly, it is engineered to support combined radial and axial loads while maintaining precise shaft alignment. Its separable cup design simplifies installation, adjustment, and maintenance, making it ideal for industrial gearboxes, heavy-duty conveyors, mining equipment, construction machinery, and general power transmission systems.

Applications:

The Timken 34478 bearing cup is designed for heavy-duty applications requiring high load capacity and reliable performance under combined radial and thrust loads. When paired with a compatible Timken cone, it is commonly used in industrial gearboxes, rolling mills, mining machinery, agricultural equipment, construction equipment, and other heavy-duty rotating equipment.

Technical Specifications:

• Manufacturer Part Number (MPN): 34478
• Manufacturer: Timken
• Product Type: Tapered roller bearing cup
• Bearing Type: Single-row tapered roller bearing cup (TS)
• Series: 34000 Series
• Compatible Cone Part Numbers: 34300, 34300A, 34301, 34304 (application dependent)
• Outside Diameter (OD): 4.7812 in (121.442 mm)
• Cup Width (C): 0.6875 in (17.463 mm)
• Design Units: Inch
• Bearing Material: Through-hardened bearing steel
• Dynamic Radial Load Rating (C1): 102,000 N (23,000 lbf) (assembly dependent)
• Dynamic Radial Load Rating (C90): 26,500 N (5,960 lbf) (assembly dependent)
• Static Radial Load Rating (C0): 136,000 N (30,600 lbf) (assembly dependent)
• Dynamic Axial Load Rating (Ca90): 20,500 N (4,600 lbf)
• e Factor: 0.45
• K Factor: 1.30
• Y Factor: 1.33
• Geometry Factor (Cg): 0.109
• Maximum Housing Fillet Radius: 0.080 in (2.03 mm)
• Housing Backing Shoulder Diameter (Da): 4.60 in (116.1 mm)
• Weight: Approximately 1.10 kg (2.4 lb)
• Function: Serves as the outer ring component of a single-row tapered roller bearing assembly supporting combined radial and axial loads.
• Features: Precision-ground raceway, separable cup design, optimized internal geometry, high load capacity, and long service life for demanding industrial applications.

Common Replacements:

• Timken 34478 tapered roller bearing cup
• SKF equivalent tapered roller bearing cup (application dependent)
• NTN equivalent tapered roller bearing cup