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

🔒Auto-locks/unlocks with door

🛠️Surface-mounted alloy steel build

KD 55.90

Duties & taxes included

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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 on both sides of your door to withstand high winds and deter intruders effectively.
SEAMLESS AUTO SECURITY - Locks and unlocks automatically with your compatible LiftMaster opener for zero hassle.
PRECISION COMPATIBILITY - Designed exclusively for select 12V LiftMaster models ensuring perfect integration and performance.
SMARTPHONE PEACE OF MIND - Monitor your garage lock status anytime, anywhere with the myQ app—security at your fingertips.
AUDIBLE LOCK CONFIRMATION - Hear the reassuring sound of the deadbolt engaging—know your garage is secure without guessing.

The LiftMaster 841LM Automatic Garage Door Lock is a surface-mounted alloy steel deadbolt that automatically locks and unlocks in sync with select 12V LiftMaster garage door openers. Featuring smartphone monitoring via the myQ app and audible lock confirmation, it offers enhanced security against intruders and storm damage. Compatible with models 8550WL, 8587WL, and 8360WL, it’s engineered for seamless integration and reliable protection.

Specifications

ASIN	B074L9JQQR
Best Sellers Rank	#151,440 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #571 in Garage Door Keypads & Remotes
Brand Name	LiftMaster
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (228)
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 Type	Alloy Steel
Model Number	841lm
Number of Items	1
Number of Pieces	1
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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