Timken MM40BS100DUH Super Precision Bearing Set

Description:

The Timken Fafnir MM40BS100 DUH super precision bearing set is used in precision ball screw support systems to provide high axial rigidity, accurate shaft positioning, and reliable performance in CNC machine tools. Commonly installed in CNC machining centers, milling machines, grinding machines, machining centers, and other precision industrial equipment utilizing ball screw drive assemblies. Maintenance teams and system integrators use this bearing set for ball screw repairs, machine tool rebuilds, precision retrofits, and replacement of worn bearing assemblies.

Applications:

The Timken Fafnir MM40BS100 DUH super precision bearing set is commonly used in CNC machining centers, vertical and horizontal machining centers, precision milling machines, grinding equipment, automated production machinery, and ball screw support assemblies where high axial stiffness, precise positioning, and long service life are required.

Technical Specifications:

• Manufacturer: Timken Fafnir
• Model / Part number: MM40BS100 DUH
• Product type: Super precision ball screw support bearing set
• Bearing type: Single-row angular contact ball bearings (matched duplex set)
• Bore diameter: 40 mm
• Outside diameter: 100 mm
• Bearing width (per bearing): 22.5 mm
• Total width (duplex set): 45 mm
• Contact angle: 60°
• Arrangement: DUH universal duplex, high preload
• Cage type: Phenolic outer land riding cage
• Ball material: Steel
• Limiting speed: 2,000 rpm (grease), 4,000 rpm (oil)
• Mounting: Ball screw support and precision spindle applications
• Application environment: CNC machine tools and precision industrial automation equipment

Common Replacements:

• SKF BSD 4090 CG angular contact bearing set
• NSK 40TAC100B angular contact bearing set
• Schaeffler FAG BSB4090 angular contact bearing set