Mighty Mule Automatic Gate Lock for Single and Dual Swing Gate Opener-FM143 - The Home Depot
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Mighty Mule

Model # FM143

Internet # 100090485

Store SKU # 493385

Automatic Gate Lock for Single and Dual Swing Gate Opener

Mighty Mule Automatic Gate Lock for Single and Dual Swing Gate Opener

This item has been discontinued.
The Home Depot no longer carries this specific product.

$119.00 / each


Model # FM143

Internet # 100090485

Store SKU # 493385

Store SO SKU # 556771

The Mighty Mule Automatic Gate lock is ideal for single and dual swing gate openers. Unlocks and locks automatically as the gate is activated to open and close to provide added security for Mighty Mule automatic gate openers. Recommended for gate leafs over 8 ft. long, high wind areas or additional reinforcement against unwanted intrusion to your property.

  • Compatible with single and dual Mighty Mule swing gate openers including models FM200, FM350, FM402, FM500 or FM502
  • Activated by Mighty Mule access controls including the single button remote (FM135), driveway vehicle sensor (FM138), wired or wireless digital keypad (FM137) or the push-button control (FM132)
  • Easy DIY (do it yourself) installation for your gate opener system
  • Installation of the gate lock provides secure protection to withstand up to 2500 lbs. of force, providing stability and security
  • Column-mount lock receiver (433IH) is recommended for use on column-mount single gate installations
  • Includes 2 keys for manual release
  • Backed by a 12 month Mighty Mule warranty and technical support

Info & Guides

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Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Access Controls and Powering Devices 
Brand/Model Compatibility 
Mighty Mule Gate Openers 
Commercial/Residential Use 
Fencing Product Type 
Gate Opener Remote/Transmitter 
Power Requirements 
AC or Solar 
Product Weight (lb.) 
6 lb 
Range (ft.) 
Warranty / Certifications
Manufacturer Warranty 
Limited 12 Month 


Rated 4.6 out of 5 by 27 reviewers.
Rated 5.0 out of 5.0 by Nice lock Easy install. Keeps the gate locked when we aren't here or don't desire company. December 10, 2014
Rated 4.0 out of 5.0 by Nice product, helps with security and protects the hinges and motor when the gate is shut. Easy to install, you will need to get the correct hardware in addition but that was expected. I am using this lock in conjunction with the Mighty Mule FM500 mounted to a 12ft. tube steel livestock type gate. Dual batteries with a 20 watt solar panel and a wireless keypad. The solar panel was purchased separately and is not the Mighty Mule brand. They want way to much money for their little solar panels. I am located in the Pacific NW and the 20 watt, dual battery configuration works flawlessly. Overall this setup is perfect for my application, very happy. January 23, 2015
Rated 1.0 out of 5.0 by Latch closes to soon I have installed the mighty mule gate openers on many gates in many different areas. This is the first time I have installed the lock. The latch releases so fast that is catches the gate before it can open past the pin. This causes the fuse to blow in the opener. I can't understand why the latch has to close so fast. There should be a timer setting or there is no need for the latch to close before the gate is fully open. I had to do some creative engineering (ie: I installed a spring inside the catch to push the gate open quickly before the latch closed). It still only works part time. November 22, 2014
Rated 4.0 out of 5.0 by Gate Lock Good lock but FYI: it does not come with mounting bolts which is somewhat understandable as every application is different. Make sure you pick up whatever bolts you are going to need to mount this to the gate and post. September 13, 2011
Rated 5.0 out of 5.0 by Installed in a snap & works fine. Went on easily and works just fine. If only everything were this easy! October 30, 2014
Rated 5.0 out of 5.0 by I chose this product to make sure no one tried to open the gate manually thereby tearing up the expensive gate opener. Installed easily although added more weight to the gate which I had to compensate for. Would highly recommend. May 30, 2006
Rated 5.0 out of 5.0 by Great product. Electric lock is necessary to assure security of the Mighty Mule solar powered gate opener. November 2, 2011
Rated 5.0 out of 5.0 by Great add-on Purchased this item for mm600 Mighty Mule opener, because I did not want anyone trying to push the gate open which can damage the opener and hardware and for high winds. My opener was too new to be part of the instructions and did not understand whether the mini circuit board had to be wired, my controller had inputs for gate lock. I called support and they answered the question and lock works great. Hardware bots or clamps not included due to multiple options, not a big deal and I knew this up front. I read instructions online before ordering. Great product. After install had to slightly adjust the closing of the gate. May 23, 2014
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