Timken 387-S 90343 Tapered Roller Bearing Assembly

Description:

The Timken 387-S 90343 tapered roller bearing assembly is a double-row tapered roller bearing assembly used in heavy-duty rotating equipment and industrial power transmission systems. Commonly installed in industrial gearboxes, mining equipment, rolling mills, construction machinery, and material handling systems where high radial and axial loads require rigid shaft support. Maintenance teams, OEMs, and system integrators use this pre-adjusted bearing assembly for equipment repair, bearing replacement, and drivetrain retrofits to improve reliability and simplify installation.

Applications:

The Timken 387-S 90343 tapered roller bearing assembly is designed for demanding industrial applications requiring high load capacity, accurate shaft positioning, and factory-set internal clearance. Its TDO (tapered double outer) configuration is commonly used in industrial gearboxes, mining machinery, rolling mills, heavy-duty conveyors, and other rotating equipment where durability, simplified installation, and extended bearing life are essential.

Technical Specifications:

• Manufacturer Part Number (MPN): 387-S 90343
• Manufacturer: Timken
• Product Type: Tapered roller bearing assembly
• Bearing Type: Double-row tapered roller bearing (TDO)
• Cone Part Number: 387-S
• Assembly Number: 90343
• Cup Part Number: 384ED
• Bore Diameter: 2.2500 in (57.150 mm)
• Outside Diameter: 3.9370 in (100.000 mm)
• Cone Width: 0.8640 in (21.946 mm)
• Double Cup Width: 1.5620 in (39.675 mm)
• Overall Bearing Width: 1.9369 in (49.197 mm)
• Cage Material: Stamped steel
• Precision Class: Class 2
• Configuration: Factory pre-adjusted matched bearing assembly (MBA)
• Weight: 5.55 lb (2.518 kg)

Common Replacements:

• SKF 387-S/90343
• NTN 387-S/90343
• KOYO 387-S/90343