Is this compatible with new B1381 Chamberlain led opener?

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.

Is this compatible with Chamberlain openers?

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.

Wiil this work on the Chamberlin B970?

NO, this will not work with the B970

How far does the box protrude laterally from the track? (e.g. what is the length of the plastic box with the bolt retracted?)

The box protrudes 7.200 from track. when in locked position the bolt protrudes .800 from inside surface of track

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Liftmaster 841LM Automatic Garage Door Lock

Liftmaster 841LM Automatic Garage Door Lock

Product ID: 47433495

Details

Brand
LiftMaster
Color
Black
Exterior Finish
Stainless
Material
Alloy Steel
Product Dimensions
8.5"L x 4.5"W

📱Smartphone monitoring via myQ app

🔒Automatic deadbolt lock

⚙️Compatible with select LiftMaster openers

€ 253.70

Duties & taxes included

In stock

Sold byAmazon SpainDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🔐 Elevate your garage security—because your peace of mind deserves the smartest lock in town.

STORM READY DEFENSE - Add dual locks for unbeatable protection against high winds and intruders.
SEAMLESS AUTO LOCKING - Locks and unlocks automatically with every garage door operation for zero hassle.
SMART SECURITY ALERTS - Stay connected and in control with real-time garage lock status on your smartphone.
PRECISION COMPATIBILITY - Engineered exclusively for select LiftMaster models ensuring flawless integration.
AUDIBLE LOCK CONFIRMATION - Hear the reassuring click that your garage is securely locked every time.

The LiftMaster 841LM Automatic Garage Door Lock is a surface-mounted alloy steel deadbolt that automatically locks and unlocks in sync with select LiftMaster garage door openers (models 8550WL, 8587WL, 8360WL, 8500W). Featuring smartphone monitoring via the myQ app and audible lock confirmation, it offers enhanced security and convenience. Designed for professional-grade protection, it’s ideal for homeowners seeking seamless, smart, and storm-resistant garage security.

Specifications

ASIN	B074L9JQQR
Best Sellers Rank	#96,536 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #392 in Garage Door Keypads & Remotes
Brand	LiftMaster
Brand Name	LiftMaster
Color	Black
Customer Reviews	4.3 out of 5 stars 228 Reviews
Exterior Finish	Stainless Steel, Silver
Global Trade Identification Number	00012381185740
Installation Type	Surface-mounted
Item Dimensions L x W x H	8.5"L x 4.5"W x 4.3"H
Manufacturer	Liftmaster/Chamberlain
Manufacturer Part Number	841lm & AOD Service Kit
Material	Alloy Steel
Material Type	Alloy Steel
Model Number	841lm
Number of Items	1
Number of Pieces	1
Product Dimensions	8.5"L x 4.5"W x 4.3"H
Recommended Uses For Product	Securing and locking/unlocking a garage door in conjunction with a compatible garage door opener
UPC	757347279797 012381185740
Unit Count	1 Count

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