Mighty Mule® Automatic Gate Opener, Single Gate


$637.66 EA

The Mighty Mule® FM500 single swing automatic gate opener is a heavy duty, commercial grade swing gate opener that is very easy to install. This gate opener will work with gates 18 feet long or weighing up to 850 pounds. The FM500 gate opener comes in a standard Do-It-Yourself kit, which includes an installation DVD, detailed manual, battery, transmitter, all mounting hardware, and 18 V AC transformer.

Availability: In Stock -

The FM500 automatic gate opener features a soft start and stop when opening and closing, an adjustable auto close, an auto gate activation alert for your protections, obstruction sensing systems, as well as an extra large control box that has room for an optional second battery. (We recommend using a second battery for solar applications). The 12 Volt, DC-powered, low-voltage system is powerful, dependable, durable, and is ideal for gates that open into the property or with gates opening out from the property using a Push-To-Open Bracket FM148 (sold separately).

Low Voltage wire (RB509) is required for most installations (sold separately). The Mighty Mule® FM500 is the best-selling DIY gate opener in America, and it is known for its ability to work well on a wide variety of swing gates, chain link fences, tube gates, or wrought iron.


  • Mighty Mule® Model FM500
  • Handles gates up to 18 feet long or 850 lbs.
  • Easy to install in 2-3 hours
  • One single gate opener
  • Installation hardware included
  • Large control box
  • 12-Volt battery back up for use during power outages
  • Transformer and transmitter included
  • Installation manual and video included
  • One automatic gate opener included
  • Mighty Mule® 12 month warranty

Brand: Mighty Mule

Shipping Information

Your order is important to us and we will strive to process it as quickly as possible. Most in-stock items are shipped within 2-4 business days and typically deliver in 5-7 business days. In-stock items may ship from multiple locations and can arrive on separate days. Heavy or bulky items will ship via Freight/Truck Service and will take 8-10 business days for delivery. For those immediate product needs, we do offer at an additional cost, express service from UPS and Motor freight.

Shipping costs are determined by item weight and your zipcode. Once you have entered your shipping address, city, state, and zip code into checkout, your shipping total will be calculated and available for review. Please see the shipping map below as a guide.

Return Information

Your satisfaction is our priority. If for any reason you are not satisfied with a purchase from Agri Supply, we will gladly refund your money, or exchange the item, or fix it should it break. A minimum one-year warranty applies to all non-perishable items, parts and service from Agri Supply, and all hand tools sold by Agri Supply have a lifetime warranty, regardless of the length of the manufacturer's warranty. See our Agri Supply Guarantee for more details.

To return an item... give us a call at 1-800-345-0169, or visit one of our 8 retail stores near you, and one of our friendly customer service representatives, or store employees, will be glad to assist you.

If you have any questions please contact our Customer Service representatives at 1-800-345-0169

Standard UPS Ground Shipping Map -
UPS Ground
The above shipping chart applies to UPS ground shipments to the 48 contiguous states only. Please call 1-800-345-0169 for timing on shipments to Alaska, Hawaii, and Puerto Rico, thank you!

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