The Timken Company NA938 Tapered Roller Bearing Cone

Description:

The Timken NA938 tapered roller bearing cone is used in heavy-duty rotating equipment requiring high radial and axial load capacity in industrial power transmission systems. Commonly installed in gearboxes, rolling mills, mining equipment, construction machinery, and large industrial drives where matched tapered roller bearing assemblies provide reliable shaft support. Maintenance teams, OEMs, and system integrators use this bearing cone for replacement, repair, retrofit, and equipment overhaul to restore load-carrying performance and extend equipment service life.

Applications:

The Timken NA938 tapered roller bearing cone is designed as the inner ring and roller assembly of a single-row tapered roller bearing, providing efficient load distribution when paired with its matching cup. It is widely used in steel mills, mining operations, paper mills, heavy industrial gearboxes, off-highway equipment, and material handling machinery where durability, precision alignment, and long bearing life are essential.

Technical Specifications:

• Manufacturer: Timken
• Manufacturer Part Number (MPN): NA938
• Product Type: Tapered roller bearing cone
• Bearing Type: Single-row tapered roller bearing cone (TS)
• Bore Diameter: 4.5000 in (114.300 mm)
• Inner Ring Width (B): 2.6250 in (66.675 mm)
• Dynamic Load Rating (C1): 129,000 lbf (572 kN)
• Dynamic Load Rating (C90): 33,300 lbf (148 kN)
• Static Load Rating (C0): 177,000 lbf (786 kN)
• Dynamic Axial Rating (Ca90): 18,600 lbf (82.7 kN)
• Maximum Shaft Fillet Radius: 0.280 in (7.10 mm)
• Approximate Weight: 44.34 lb (20.11 kg)
• Compatible Cup: Timken 932
• Design: Separable tapered roller bearing cone assembly

Common Replacements:

• Timken 938 tapered roller bearing cone
• SKF compatible tapered roller bearing cone equivalent
• NTN compatible tapered roller bearing cone equivalent