Timken MM20BS47 QUH Quadruplex Angular Contact Ball Screw Bearing Set

Description:

The Timken Fafnir MM20BS47 QUH is a factory-matched quadruplex angular contact ball screw support bearing set consisting of four precision single-row angular contact ball bearings arranged with a heavy preload (QUH). Designed specifically for ball screw support applications, this matched bearing set delivers exceptional axial stiffness, precise shaft positioning, and reliable support for combined radial and axial loads in high-precision motion systems. Commonly installed in industrial gearboxes, conveyors, mining equipment, construction machinery, agricultural equipment, CNC machine tools, and power transmission systems, the MM20BS47 QUH bearing set provides outstanding rigidity, repeatable positioning accuracy, and dependable long-term performance. Maintenance teams, OEMs, and system integrators specify this factory-matched bearing set for equipment repair, replacement, machine rebuilds, and retrofits where high-precision motion control and factory-matched preload are essential.

Applications:

The Timken Fafnir MM20BS47 QUH matched quadruplex ball screw support bearing set is engineered for precision industrial applications requiring maximum axial rigidity, accurate shaft positioning, and reliable operation under combined radial and axial loads. It is widely used in CNC machining centers, ball screw assemblies, industrial automation equipment, precision positioning systems, heavy-duty machine tools, industrial gearboxes, conveyors, and power transmission systems where the heavy-preload quadruplex arrangement minimizes deflection, improves positioning repeatability, enhances machining accuracy, and extends bearing service life.

Technical Specifications:

• Manufacturer: Timken Fafnir
• Manufacturer Part Number (MPN): MM20BS47 QUH
• Product Type: Matched quadruplex ball screw support bearing set
• Bearing Type: Precision single-row angular contact ball bearings (quadruplex set)
• Series: MM-BS (Ball Screw Support)
• Design Series: QUH (Quadruplex, Heavy Preload)
• Bore Diameter: 20 mm
• Outside Diameter: 47 mm (1.8504 in)
• Width(s): 15 mm per bearing; 60 mm (2.3624 in) 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: 5,600 lbf (24,900 N)
• Static Rating: 5,600 lbf (24,900 N)
• Dynamic Axial Rating: 9,100 lbf (40,500 N) (preloaded set)
• Weight: Refer to manufacturer specification
• Compatible Configuration: Factory-matched QUH quadruplex set; components are not intended to be mixed with unmatched bearings.

Common Replacements:

• Timken Fafnir MM20BS47 QUH matched set
• Timken Fafnir MM20BS47 QUL matched set
• OEM equivalent 20 mm quadruplex ball screw support bearing set