LiftMaster 841LM Automatic Garage Door Lock

The LiftMaster® 841LM Automatic Garage Door Lock from Action Industries is a professional-grade security solution designed for sectional doors equipped with torsion assemblies. This heavy-duty deadbolt automatically engages when the door closes and disengages when it opens, eliminating the need for manual operation. When installed on both sides of the door, the 841LM provides enhanced reinforcement against forced entry and additional structural support in high-wind conditions. Engineered for seamless integration, it works in coordination with compatible LiftMaster® garage door operators to ensure dependable locking performance with every cycle.

Specifications

• For sectional doors with torsion assemblies only
• Automatic deadbolt engages with each close cycle
• Compatible with select LiftMaster® Security+ 2.0 garage door operators
• Certified UL-tested system for safe and reliable operation
• Two-lock configuration tested to meet hurricane-ready standards
• Manual release option available when needed
• Audible engagement confirms secure locking
• Integrates with MyQ® smartphone monitoring for remote status verification

Compatible Operators

• LiftMaster® 8550WL Elite Series DC Battery Backup Belt Drive Wi-Fi Operator
• LiftMaster® 8587W Elite Series 3/4 HP AC Chain Drive Wi-Fi Operator
• LiftMaster® 8360W Premium Series DC Battery Backup Capable Chain Drive Wi-Fi Operator
• LiftMaster® WLED DC Battery Backup Belt Drive LED Wi-Fi Operator
• LiftMaster® 8580WLB Elite Series DC Battery Backup Chain Drive Wi-Fi Operator

Part Numbers

• 841LM — Automatic Garage Door Lock