Timken MM40BS72QUH Quadruplex Angular Contact Ball Screw Support Bearing

Description:

The Timken Fafnir MM40BS72QUH 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). Specifically engineered for ball screw support applications, this matched bearing set delivers exceptional axial stiffness, high positioning accuracy, and reliable support for combined radial and axial loads in precision motion systems. Commonly installed in CNC machine tools, precision automation equipment, industrial gearboxes, conveyors, machine positioning systems, and power transmission systems, the MM40BS72QUH bearing set provides outstanding rigidity and repeatable performance in demanding industrial environments. 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 long service life are critical.

Applications:

The Timken Fafnir MM40BS72QUH quadruplex ball screw support bearing set is designed for precision industrial applications requiring maximum axial rigidity, accurate shaft positioning, and smooth 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, and power transmission systems where the heavy-preload quadruplex arrangement minimizes deflection, improves repeatability, enhances machining accuracy, and extends bearing service life.

Technical Specifications:

• Manufacturer: Timken Fafnir
• Manufacturer Part Number (MPN): MM40BS72QUH
• 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: 40 mm
• Outside Diameter: 72 mm (2.8346 in)
• Width(s): 15 mm per bearing; 60 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: 8,160 lbf (36,300 N) per row
• Static Rating: 10,200 lbf (45,400 N) per row
• Weight: Approximately 2.32 lb (1.05 kg)
• Compatible Configuration: Factory-matched quadruplex (QUH) set with heavy preload; components are not intended to be mixed with unmatched bearings.

Common Replacements:

• Timken Fafnir MM40BS72QUH matched set
• Timken Fafnir MM40BS72QUL matched set
• OEM equivalent 40 mm quadruplex ball screw support bearing set