LiftMaster K12-10331 Flange Bearing for SD & APT Operators

Precision-Machined Flange Bearing for High-Cycle Commercial Operators

The LiftMaster K12-10331 is a precision-engineered replacement flange bearing designed to support drive shaft assemblies in commercial-grade SD and APT series door operators. With a durable 3/4" inner diameter and corrosion-resistant construction, this bearing ensures smooth rotational performance and long-term reliability in demanding security applications.

Whether maintaining overhead commercial doors or securing vehicle access points, replacing worn or degraded bearings is critical to preserving operator efficiency and system integrity.

Key Features

• Exact Replacement: Compatible with various LiftMaster SD and APT commercial operators.
• Heavy-Duty Construction: Zinc-plated steel housing resists wear and corrosion.
• Optimized Fit: Measures 3/4" ID x 1-1/2" OD x 1/8" flange thickness for secure seating.
• Smooth Rotation: Provides reliable shaft support under continuous-duty operation.

Technical Specifications

• Model: K12-10331
• Also Known As: 12-10331, 11A52, 1210331
• Bearing Type: Flange bearing
• Inner Diameter: 3/4"
• Outer Diameter: 1-1/2"
• Flange Thickness: 1/8"
• Material: Zinc-plated steel
• Application: LiftMaster SD and APT commercial operators

Conclusion

The LiftMaster K12-10331 flange bearing is a vital component for maintaining peak performance in commercial overhead operator systems. Designed for high-cycle reliability, this replacement bearing supports smooth shaft motion while minimizing wear on critical drive components.