Timken 3MM9118WITA3372 Angular Contact Ball Bearing

Description:

The Timken 3MM9118WITA3372 precision angular contact ball bearing is designed to provide high-speed, high-accuracy rotational support while carrying combined radial and axial loads in precision spindle and machine tool applications. Commonly installed in CNC machining centers, grinding machines, milling machines, precision spindles, and other high-performance industrial equipment where exceptional rigidity and rotational accuracy are required. Maintenance teams, OEMs, and machine rebuilders use this precision bearing for spindle rebuilds, equipment overhauls, precision retrofits, and replacement of worn high-speed bearings.

Applications:

The Timken 3MM9118WITA3372 precision angular contact ball bearing is commonly used in CNC machine tool spindles, precision grinding equipment, milling machines, and other high-speed industrial machinery requiring exceptional accuracy, low runout, and high rotational speeds. It belongs to the Timken Fafnir precision spindle bearing family and features a 25° contact angle with ABEC 7 / ISO P4S precision for demanding machining applications.

Technical Specifications:

• Manufacturer: Timken Fafnir
• Model / Part number: 3MM9118WITA3372
• Product type: Precision angular contact ball bearing
• Bearing type: Single-row angular contact spindle bearing
• Bore diameter: 90 mm (3.543 in)
• Outside diameter: 140 mm (5.512 in)
• Width: 24 mm (0.945 in)
• Contact angle: 25°
• Ball material: Steel
• Cage type: Phenolic outer land riding cage
• Precision class: ISO P4S / ABEC 7 equivalent
• Dynamic radial load rating (C1): 68.5 kN (15,400 lbf)
• Extended dynamic radial load rating (Ce): 75.2 kN (16,900 lbf)
• Static radial load rating (C0): 65.8 kN (14,800 lbf)
• Limiting speed (grease): 8,300 rpm
• Limiting speed (oil): 16,600 rpm
• Design units: Metric
• Application environment: High-speed machine tool spindles, precision machining equipment, and industrial automation systems

Common Replacements:

• SKF 7018 CD/P4A angular contact ball bearing
• NSK 7018CTYNSULP4 angular contact ball bearing
• FAG B7018-E-T-P4S angular contact ball bearing