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Mighty Mule

Model # FM502

Internet # 100095256

Heavy Duty Dual Swing Automatic Gate Opener

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

$699.00 /each




Model # FM502

Internet # 100095256

Store SO SKU # 507211

The Mighty Mule gate opener allows you to open and close vehicular gates by remote control. The FM502 is designed for dual swing gates up to 18 ft., or up to 850 lbs. (per panel). Easy to install within 2-3 hours - comes with an installation video and detailed installation manual, as well as all mounting hardware and batteries needed for operation.

  • Includes: FM502 dual opener kit (control box, FM150 battery, FM135 transmitter, AC transformer and mounting hardware)
  • Gates that open away from the property will require two push-to-open brackets (FM148, not included)
  • Transform this unit to a solar gate opener by using the solar panel charging kit (FM123, not included)
  • Mighty Mule accessories allow you to customize your gate opener system with additional entry transmitters, keypad/intercoms, and more

Info & Guides

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Maximum gate size (ft.) 
Product Depth (in.) 
Product Height (in.) 
Product Width (in.) 
Commercial/Residential Use 
Fencing Product Type 
Gate Opener Remote/Transmitter 
Gate opening style 
Hardware Included 
Power Requirements 
AC or Solar 
Product Weight (lb.) 
52 lb 
Weight Capacity (lb.) 
Warranty / Certifications
Manufacturer Warranty 
Limited 18 Month 


Rated 4.0 out of 5 by 39 reviewers.
Rated 5.0 out of 5.0 by A claim that doesn't make sense The manufacture claim that you can use up to an 18' gate each side let's see 18' + 18' = 36' so why would the wire from the slave arm be about 22' long. I have two 10' gates and the wire on the new GTO FM 502 was not as long as the unit I am replacing which happens to be a GTO FM 502 I bought new about eight years ago so I had to splice the two together not really something you want to do I hope it last's. If you are going to try to save a little money by shorting the length of the wire in the slave arm please let the consumer know or give an option for a wire that is applicable to their application so they don't have to go through the frustration I did other than that the product works OK. October 13, 2015
Rated 5.0 out of 5.0 by Even the best has room for improvement The Positive: As a contractor I see products a bit differently. To start with the openers are everything they say! Easy to install and operate smoothly. I am sure a home owner will have little problems installing them. The Negative: The company advertises them to work with up to an 18' wide gate but doesn't provide enough wire on the slave opener to even come close to crossing the driveway and making it back to the control box. Splicing underground takes special connections to keep the joints dry! A small issue missed in the instructions was when you have gates that swing away from your property and you want to reset the stop limits reverse the gate location from what is printed in the manual. October 25, 2014
Rated 5.0 out of 5.0 by Much better, easier to follow instructions This is my second Mighty Mule 502 set. The first lasted over 14 years even though I did have to replace the circuit board after about 8 years. The instructions for setting the close operation are much easier to understand and follow with this new set. I really am happy with the product and highly recommend it. October 12, 2014
Rated 1.0 out of 5.0 by Worked great for the first few months... We purchased this opener for use with our new driveway double gate and were very pleased with its performance for about six months. Since then, we have had to contact tech support a NUMBER of times for different issues, and have been very frustrated by some of these interactions with Mighty Mule. Currently, we are having to pay out-of-pocket to ship one of the gate arms to their repair service, rendering our automatic gate useless until we receive the repaired or replaced arm. I have used an automatic gate opener in the past from a different manufacturer and had no malfunctions after several years. We are highly disappointed in the quality of this product! I wish we had looked over their website and noted the large number of troubleshooting FAQs that have affected other customers - it certainly would have made us more cautious about our purchase. December 6, 2011
Rated 5.0 out of 5.0 by Very nice gate opener Easy to install for the do-it-yourselfer. Make sure if you have 4" galvinized heavy duty post you have a couple 1/2" (two or three at least) drill bits. I even used a 1/4" then 3/8" and then 1/2". It has been installed for two weeks now and no real complaints. It does operate (or open and close) slowly but beside of that it is awesome. Caught it on sale and jumped all over this and glad I did. May 12, 2015
Rated 5.0 out of 5.0 by Great product great price We had our house burglarized and we had our iron gates installed but needed the gate openers and lets tell you we had searched a lot of gate openers and you were the best price around. The shipping was very fast and we were able to install the gate openers just in time for us to go on vacation. It was nice to be on vacation and have piece of mind our house was secure. Would buy again from this company. Thank you. Kim and George Johnson Gridley, CA June 6, 2013
Rated 5.0 out of 5.0 by MightyMule FM-502 We bought this for our drive, Have had it a few weeks, and after getting used to having it, works great, no problems as of yet, and was a breeze to install! November 11, 2013
Rated 5.0 out of 5.0 by Gate and opener This gate opener worked out really well. I installed it myself on a 14' iron gate which was also from GTO. The installation instructions were clear and easy to understand. Just be ready for some drilling through the steel poles. It takes a little advance planning for the conduit install for the wiring. The only thing extra I had to buy was the low voltage wire to supply power to the opener. December 23, 2014
  • 2015-11-26 T11:27:57.867-06:00
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