Timken MM45BS100DUH Ball Screw Support Bearing Set

Description:

The Timken Fafnir MM45BS100 DUH is a matched duplex angular contact ball screw support bearing set consisting of two factory-matched single-row precision angular contact ball bearings arranged with a heavy preload (DUH). Designed specifically for ball screw support applications, this matched bearing set delivers high axial stiffness, precise shaft positioning, and excellent accuracy while supporting combined radial and axial loads. Commonly installed in CNC machine tools, precision automation equipment, industrial gearboxes, conveyors, machine positioning systems, and power transmission systems, the MM45BS100 DUH bearing set provides dependable performance in high-precision motion control applications. Maintenance teams, OEMs, and system integrators specify this matched duplex bearing set for equipment repair, replacement, machine rebuilds, and retrofits where factory-matched precision bearings are essential for maintaining positioning accuracy and service life.

Applications:

The Timken Fafnir MM45BS100 DUH matched duplex ball screw support bearing set is engineered for precision industrial applications requiring high rigidity and accurate axial positioning. It is widely used in CNC machining centers, ball screw assemblies, industrial automation equipment, machine tools, precision positioning systems, and power transmission systems where the heavy-preload duplex arrangement minimizes deflection, improves repeatability, distributes combined radial and axial loads efficiently, and extends bearing service life.

Technical Specifications:

• Manufacturer: Timken Fafnir
• Manufacturer Part Number (MPN): MM45BS100 DUH
• Product Type: Matched duplex ball screw support bearing set
• Bearing Type: Precision single-row angular contact ball bearings (duplex set)
• Series: MM-BS (Ball Screw Support)
• Design Series: DUH (Duplex, Heavy Preload)
• Bore Diameter: 45 mm
• Outside Diameter: 100 mm (3.9370 in)
• Width(s): 22.5 mm per bearing; 45.0 mm total set width
• Cage Type: Phenolic outer land riding cage
• Material: Bearing steel with steel balls
• Load Type: Combined radial and axial loads
• Dynamic Rating: 16,010 lbf (71,200 N)
• Static Rating: 21,000 lbf (93,400 N)
• Contact Angle: 60°
• Weight: Refer to manufacturer specification
• Compatible Configuration: Factory-matched duplex set; not intended to be mixed with unmatched bearings.

Common Replacements:

• Timken Fafnir MM45BS100 DUH matched set
• Timken Fafnir MM45BS100 DUL matched set (light preload)
• OEM equivalent 45 mm duplex ball screw support bearing set