---
product_id: 47433495
title: "841LM Automatic Garage Door Lock"
brand: "liftmaster"
price: "A$346"
currency: AUD
in_stock: true
reviews_count: 12
category: "Lift Master"
url: https://www.desertcart.com.au/products/47433495-841lm-automatic-garage-door-lock
store_origin: AU
region: Australia
---

# 12V power compatibility Smartphone monitoring via myQ app Automatic deadbolt lock 841LM Automatic Garage Door Lock

**Brand:** liftmaster
**Price:** A$346
**Availability:** ✅ In Stock

## Summary

> 🔐 Elevate your garage security—because your peace of mind deserves the best lock in the game.

## Quick Answers

- **What is this?** 841LM Automatic Garage Door Lock by liftmaster
- **How much does it cost?** A$346 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.com.au](https://www.desertcart.com.au/products/47433495-841lm-automatic-garage-door-lock)

## Best For

- liftmaster enthusiasts

## Why This Product

- Trusted liftmaster brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Dual-Side Defense:** Add locks on both sides of your garage door to withstand storms and deter intruders.
- • **Seamless Auto Locking:** Locks and unlocks automatically with your garage door opener for effortless security.
- • **Smart Security Alerts:** Monitor your garage status anytime, anywhere with the myQ app integration.
- • **Precision Compatibility:** Designed exclusively for select LiftMaster 12V openers ensuring perfect fit and function.
- • **Audible Lock Confirmation:** Hear the reassuring sound of the lock engaging every time for peace of mind.

## Overview

The LiftMaster 841LM Automatic Garage Door Lock is a 12V surface-mounted deadbolt lock that integrates seamlessly with select LiftMaster garage door openers (models 8550WL, 8587WL, 8360WL, 8500W). It automatically locks and unlocks with every door operation, offers smartphone monitoring via the myQ app, and provides audible confirmation of secure locking. Ideal for enhancing security against intruders and extreme weather, it supports dual-side installation for maximum protection.

## Description

Features: Automatic operation, performs in tandem with the opener, so it always locks and unlocks. Anywhere assurance, smartphone monitoring with the myq app means homeowners always know that the garage is securesafety and security: Absolute protection, the automatic deadbolt lock makes the garage door virtually impenetrable audible security, the sound of the lock engages providing homeowners with assurance that the door is closed and secure. Compatibility: Works with three new select lift master auto lock capable garage door openers 8550w dc battery backup belt drive wi fi 8587w ¾ hp ac chain drive wi fi 8360w dc battery backup capable chain drive wi fi.

Review: 12 volt or 120 volt. Make sure you have right one. - Easy fix
Review: Good device to have for that added security. - Was delivered on time, and I had no problems installing on track. My garage track already had the predrilled holes on them, so all I had to do was screw the device in. The lock works great, easy to install and I will buy a 2nd for the other side. I recommend this lock if your LiftMaster has the shield icon, it does add more security to the garage door from being lifted. Once I press the garage button, the lock automatically unlocks and when it’s closing, the bolt engages and locks.

## Features

- The 841LM works automatically with your garage door opener so it always locks and unlocks with every operation of the door.
- The model 841LM 12V lock is only compatible with the following garage door opener model numbers: 8550WL, 8587WL, 8360WL, 8500W.
- It is not interchangeable with the 24V lock used on residential jackshaft garage door opener models 3800, 3900 and 8500.
- Add a lock to each side of the door for the best defense against high winds and storms and intruders

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B074L9JQQR |
| Batteries Included? | No |
| Batteries Required? | No |
| Best Sellers Rank | #138,146 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #592 in Garage Door Keypads & Remotes |
| Customer Reviews | 4.3 4.3 out of 5 stars (222) |
| Date First Available | August 5, 2017 |
| Description Pile | Lithium |
| Global Trade Identification Number | 00012381185740 |
| Installation Type | Surface-mounted |
| Is Discontinued By Manufacturer | No |
| Item Package Quantity | 1 |
| Item Weight | 2.99 pounds |
| Item model number | 841lm |
| Manufacturer | Liftmaster/Chamberlain |
| Number of Pieces | 1 |
| Part Number | 841lm & AOD Service Kit |
| Product Dimensions | 8.5 x 4.5 x 4.3 inches |
| Recommended Uses For Product | Securing and locking/unlocking a garage door in conjunction with a compatible garage door opener |
| Special Features | Virtually Impenetrable, Sound of Lock Engages |
| Style | Modern |
| UPC | 757347279797 012381185740 |

## Product Details

- **Brand:** LiftMaster
- **Color:** Black
- **Exterior Finish:** Stainless Steel, Silver
- **Material:** Alloy Steel
- **Product Dimensions:** 8.5"L x 4.5"W x 4.3"H

## Images

![841LM Automatic Garage Door Lock - Image 1](https://m.media-amazon.com/images/I/414Nl84FrcL.jpg)

## Questions & Answers

**Q: Is this compatible with new B1381 Chamberlain led opener?**
A: Yes it is. I purchased the B1381 in Dec 2019 and it has the security shield symbol on the cover ( it is a shield with half light and half dark divided diagonally). It also has two lock connectors on the unit next to the up and down adjustment buttons close to where you connect the wires for the sensors and control panel and the WiFi learn button. Since it has two lock connectors if you want you can connect two of these locks, one on each side of your door.

**Q: Is this compatible with Chamberlain openers?**
A: It is compatible with at least some some Chamberlain openers.  Liftmaster and Chamberlain are the same company. To know if yours is compatible the two requirements are for it to have the shield symbol on the cover and for there to be two lock connectors on the unit next to the up and down adjustment buttons. I have the Chamberlain B1381 and it is compatible.

**Q: Wiil this work on the Chamberlin B970?**
A: NO, this will not work with the B970

**Q: How far does the box protrude laterally from the track? (e.g. what is the length of the plastic box with the bolt retracted?)**
A: The box protrudes 7.200 from track. when in locked position the bolt protrudes .800 from inside surface of track

## Customer Reviews

### ⭐⭐⭐⭐⭐ 12 volt or 120 volt. Make sure you have right one.
*by M***T on November 16, 2025*

Easy fix

### ⭐⭐⭐⭐⭐ Good device to have for that added security.
*by C***S on July 15, 2018*

Was delivered on time, and I had no problems installing on track. My garage track already had the predrilled holes on them, so all I had to do was screw the device in. The lock works great, easy to install and I will buy a 2nd for the other side. I recommend this lock if your LiftMaster has the shield icon, it does add more security to the garage door from being lifted. Once I press the garage button, the lock automatically unlocks and when it’s closing, the bolt engages and locks.

### ⭐⭐⭐⭐⭐ Original equipment.
*by M***T on February 1, 2026*

This an original Lift Master part. The other ones that are being sold are not original equipment and don’t last very long. I could tell right when I installed this it was better.

## Frequently Bought Together

- Liftmaster 841LM Automatic Garage Door Lock
- LIFTMASTER 8900W Light-Duty Commercial JACKSHAFT Operator W/Built-in WI-FI for SECTIONAL Doors LJ8900W
- New LiftMaster 485LM Battery Backup for Garage Door Openers 3840 3850 8360 8550

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**Shop now:** [https://www.desertcart.com.au/products/47433495-841lm-automatic-garage-door-lock](https://www.desertcart.com.au/products/47433495-841lm-automatic-garage-door-lock)

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*Product available on Desertcart Australia*
*Store origin: AU*
*Last updated: 2026-03-17*