Timken K38958 Tapered Roller Bearing Cup Outer Ring

Description:

The Timken K38958 tapered roller bearing cup is a precision single cup (outer ring) designed for use with the matching Timken NA12581SW tapered roller bearing cone to form a complete tapered roller bearing set capable of supporting combined radial and axial loads. Commonly installed in industrial gearboxes, conveyors, mining equipment, construction machinery, agricultural equipment, and power transmission systems, this bearing set provides precise shaft alignment, high load-carrying capacity, and reliable long-term performance in demanding industrial environments. Maintenance teams, OEMs, and system integrators specify the Timken NA12581SW/K38958 tapered roller bearing set for equipment repair, replacement, machine rebuilds, and retrofits where dependable operation and extended bearing life are required.

Applications:

The Timken NA12581SW/K38958 tapered roller bearing set is engineered for heavy-duty industrial applications requiring reliable support under combined radial and axial loads. It is widely used in industrial gear reducers, heavy-duty conveyors, mining and aggregate equipment, construction machinery, agricultural equipment, and power transmission systems where the matched cone and cup assembly delivers accurate shaft positioning, efficient load distribution, reduced friction, and extended service life.

Technical Specifications:

• Manufacturer: Timken
• Manufacturer Part Number (MPN): K38958 (Cup) / NA12581SW (Cone)
• Product Type: Tapered roller bearing set
• Bearing Type: TS single-row tapered roller bearing assembly
• Series: 12500 Series
• Design Series: TS (Tapered Single)
• Cone Part Number: NA12581SW
• Cup Part Number: K38958
• Bore Diameter: 31.750 mm (1.2500 in)
• Outside Diameter: 72.238 mm (2.8440 in)
• Width (T): 33.338 mm (1.3125 in)
• Cone Width (B): 33.338 mm (1.3125 in)
• Cup Width (C): 25.400 mm (1.0000 in)
• Cage Type: Stamped steel
• Material: High-grade bearing steel
• Load Type: Combined radial and axial loads
• Weight: 1.41 kg (3.12 lb)
• Compatible Cone/Cup: Timken NA12581SW cone / Timken K38958 cup

Common Replacements:

• Timken NA12581SW/K38958 bearing set
• NTN equivalent NA12581SW/K38958
• SKF equivalent NA12581SW/K38958