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  1. Trailer Tongue Lock
  2. InfiniteRule
  3. Fits 2 Inch Ball
  4. Fits 2-5/16 Inch Ball
  5. Keyed Unique
  6. Latch Lock
InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers - 2" and 2-5/16"
InfiniteRule

InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers - 2" and 2-5/16"

Part Number: IR66FR
In Stock
$67.95
Retail:$78.68
You Save: 14%
Trailer Tongue Lock
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Heavy-duty, stainless steel lock provides superior security when locking your cast Demco eZ-Latch trailer coupler or gooseneck coupler ball. Third-party-tested pin has a 42,000-lb shear strength. Great Prices for the best trailer tongue lock from InfiniteRule. InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers - 2" and 2-5/16" part number IR66FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (139)
  • Q & A (0)
  • Photos

InfiniteRule Trailer Tongue Lock - IR66FR

  • Fits 2 Inch Ball
  • Fits 2-5/16 Inch Ball
  • Keyed Unique
  • Latch Lock
  • InfiniteRule
  • Stainless Steel
  • 2-15/16 Inch Span
  • Universal Application Lock

Heavy-duty, stainless steel lock provides superior security when locking your cast Demco eZ-Latch trailer coupler or gooseneck coupler ball. Third-party-tested pin has a 42,000-lb shear strength.


Features:

  • Flush-style lock fits your 2" or 2-5/16" cast Demco eZ-Latch trailer coupler or gooseneck coupler ball
    • Coupler latch lock secures your trailer to your ball mount
  • Heavy-duty stainless steel construction
  • O-ring protects internal components from dirt and grime
  • Weather-resistant, tethered dust cap keeps water and debris out of keyway
  • 2 Keys included
  • Made in the USA


Specs:

  • Application: cast Demco eZ-Latch trailer coupler for a 2" or 2-5/16" ball or a gooseneck coupler ball
  • Shear strength: 42,000 lbs
  • Pin dimensions:
    • Overall length: 4-3/8"
    • Diameter: 1/4"
    • Inside pin length (span): 2-15/16"
  • 1-Year warranty


Note: This lock will only work with Demco EZ Latch couplers that are cast and not stamped.


Extensive Testing

InfiniteRule products undergo extensive third-party testing to determine shear strength. The shear strength is determined by placing the locking pin in a stress position and subjecting it to increasing force until a required proof load (maximum force received without deformity) is met or the pin fails. These locks have a shear strength of 42,000 lbs.



61130-D Infinite Rule Security, Inc. Lock - Stainless Steel Trailer Tongue Latch Lock - 1/4" x 2-5/16" Span

Replaces IR56FR (61121-D)




California residents: click here


Customer Satisfaction Score:

Ratings & Reviews

4.8

138 reviews
Heavy-duty, stainless steel lock provides superior security when locking your cast Demco eZ-Latch trailer coupler or gooseneck coupler ball. Third-party-tested pin has a 42,000-lb shear strength.

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exceptional service from Stacey A.



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Should work built tough fits good



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138
Show More Reviews

See what our Experts say about this InfiniteRule Trailer Tongue Lock

  • Recommended Lock for MORryde GooseTech 5th Wheel to Gooseneck Pin Box
    Hey Jeff! The MORryde GooseTech 5th Wheel to Gooseneck Pin Box # MR97MV comes with a Demco eZ-Latch. The best option for a lock is the InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers # IR66FR. This is designed to for a standard coupler but fits the GooseTech as well. Are you replacing a 1621 on your 5th wheel?
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  • What Coupler Lock Is Recommended For The Demco EZ-Latch Coupler On A Big Tex 30SA Trailer
    Hello Brett, thanks for reaching out. For you I recommend the InfiniteRule Coupler Lock # IR66FR. This lock is made specifically for the Demco EZ-Latch couplers, and it will work with both the 2" and 2-5/16" ball couplers. It has a 42,000 lb shear strength so it is a good strong effective lock.
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  • Coupler Lock Recommendation For Demco Channel Tongue Trailer Coupler DM15945
    Hello John. The InfiniteRule Lock # IR66FR is the best lock option for the Demco Channel Tongue Trailer Coupler # DM15945. This lock was made specifically for the Demco eZ-Latch couplers, so it will work great for you. To answer your second question, there is no hitch pin lock that can be keyed to match this lock, so you would have to keep two different sets of keys.
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  • Will MORryde GooseTech Have Clearance Issues With Bed Rails
    Hey Travis! You won't have any issues with vertical clearance using the MORryde GooseTech # MR27MV. The only clearance issues you might run into is if your 2017 Ford F-350 is the short bed. If you have the long bed this is going to be a really nice upgrade for your setup. You will also need safety chains # GY49GR and if you want a lock for added security you can use the # IR66FR. I'm assuming you already identified your pin box and it has a Lippert 1116 bolt pattern. What kind of 5th...
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  • What Size Lock Works w/ the Cast Trailer Coupler e88FV?
    Hey Jamie. The Cast Trailer Coupler item # e88FV uses a 5/16" pin to secure it so it requires a 1/4" pin diameter lock like the InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers item # IR66FR. The fixed locking point on the coupler may need to be slightly drilled out to widen it. What kind of trailer do you have?
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  • How Can I Secure My Kar Kaddy From a Thief Stealing it While it is Attached to RV & While Storing?
    Hello David, Those are very valid concerns, especially in the world we live in today. I have 2 different locks for you to keep those "sticky bandits" away: 1st lock is the InfiniteRule Lock for Demco eZ-Latch Trailer Couplers - 2" and 2-5/16" # IR66FR, this lock is great for keeping the Kar Kaddy attached to the ball. You can also use the lock while it is disengaged but will probably not deter the seasoned "treasure hunter." 2nd lock let's go a step above, or better yet all the way to...
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  • Can I Tow w/ the InfiniteRule Lock for Demco eZ-Latch Trailer Couplers IR66FR Installed?
    Yes, you can so long as your Demco EZ latch coupler is cast like item # DM14040-81 or item # DM37ZR. The InfiniteRule Lock for Demco eZ-Latch Trailer Couplers item # IR66FR works great with these couplers whether they're being towed or parked.
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  • Recommended Lock for the Demco eZ-Latch Gooseneck Coupler Adapter
    Hey Connor, there is no integrated lock for the Demco eZ-Latch Gooseneck Coupler # DM73KV but you can use the InfiniteRule Lock for Demco eZ-Latch Trailer Couplers # IR66FR to lock it, no Gooseneck coupler lock necessary. What kind of trailer do you have? If you have any other questions, please feel free to drop a comment and let me know!
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  • Can the InfiniteRule Lock for Demco eZ-Latch Trailer Couplers Be Keyed Alike?
    Hey Oliver, welcome back. The InfiniteRule Lock for Cast Demco eZ-Latch Trailer Couplers item # IR66FR can not be keyed alike. To get multiple locks keyed alike that are compatible with the Demco EZ-Latch like item # 12660-97SP, you'll need to go with our etrailer Surge Brake Coupler Lock item # e98887 for a 2-1/2" span or item # e39PR for a 2-3/4" span. Please note that you will need to purchase the locks at the same time and select the "keyed alike" option from the drop down above...
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  • Which MORryde GooseTech Pin Box Can Replace MORryde Cushioned Pin Box RPB72-1621SHD-TA
    Hey Jimmy! MORryde doesn't have an option with the GooseTech that uses 6 bolts per side. However, the MORryde GooseTech 5th Wheel to Gooseneck Pin Box for 18K+ Trailers w/ Lippert 1621 # MR47MV still has a 24k capacity with 5 bolts per side. As long as you have a GVWR of 18,000+ lbs on your trailer this is the correct model. You will also need safety chains # GY49GR. A lock # IR66FR is available as well if you want to keep it secure. What kind of 5th wheel do you have?
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  • Coupler Lock that Fits Head of Demco EZ Latch Actuator DA75
    Hey Michael, we actually have a coupler lock from InfiniteRule that was designed to fit the cast heads of the Demco DA75 actuators like the part # DM33CV with the part # IR66FR. This is the correct length pin to fit the head of the DA75 and prevent the latch from being opened. This also will allow you to lock the coupler to your hitch ball when parked as well.
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  • Lock for Demco Hydraulic Brake Actuator
    Hi Frank; I'm sorry to say the # IR66FR is not compatible with your Demco Hydraulic Brake Actuator # DM72VR since it is stamped and not cast. For whatever reason they don't have a different version for that Demco coupler style. You will have to stick with a standard pin lock like # e98888 or get a surround lock like the BulletProof Hitches Extreme Duty Coupler Lock # BPH96VR. I like the surround style since it takes more work for your average thief to defeat it. What kind of trailer do...
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  • Lock for Demco EZ Latch Coupler # DM114041-8
    Hey Alan, yes we do have locks for the Demco EZ latch coupler # DM14040-81 that you referenced with the InfiniteRule Lock part # IR66FR.
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  • Can Lock Be Added To Prevent Theft Of Shocker Gooseneck Hitch Coupler?
    Great question! Very smart to lock nice equipment like this. The Shocker Gooseneck Hitch Round # SHK56YR has a built-in spring-loaded Demco eZ-Latch, which works great with most gooseneck locks like the InfiniteRule # IR66FR . If you’re parking in public lots or doing overnight hauls, a coupler lock is a must. What trailer are you planning to install this hitch on?
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  • Will The InfiniteRule Coupler Lock # IR66FR Fit Demco Coupler # DM15000-52?
    Yes, the InfiniteRule Lock # IR66FR is specifically designed to fit Demco eZ-Latch Trailer Couplers like the # DM15000-52.
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  • 2014 T@G Trailer A-Frame Coupler Replacement for Easy Use
    Hey Mike, thanks for reaching out! I mean you can technically install the Curt QuickPin No-Latch Trailer Coupler # C22CR on an A-Frame but you're looking at some pretty heavy modifications and you'll need to hire out a professional welder for this too. For something easier than the standard coupler you currently have, I recommend going with the Demco eZ-Latch # DM14793-81 instead. This is just easier to use altogether, and it can be bolted or welded on to your trailer frame depending...
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  • Does InfiniteRule Lock Fit Demco EZ Latch Coupler
    Hey Joe, thanks for the picture of your coupler! From seeing that I can tell you that the InfiniteRule Lock part # IR66FR that you referenced is a fit for the style of Demco EZ Latch coupler that you have. How do you like the coupler?
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  • Shocker Hitch 5th Wheel to Gooseneck Coupler For 2026 Forest River Arctic Wolf 285OPT
    Hey Garrett! The correct Shocker Hitch 5th Wheel to Gooseneck Coupler depends on the pin box you have now. Do you know your pin box bolt pattern? If you don't know which one you have I would be happy to find it for you. You can email me a picture of the sticker on your pin box with the serial number by replying to the email with the link for this page. For example, the # SHK99YR fits Lippert 1621, 0719, and Rhino Box pin boxes. If that is what you have then this will work for your setup....
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  • Recommended Lock For A Demco 2-5/16" EZ Latch Coupler
    You certainly can use the Trimax Coupler lock # TMX47FR with the Demco 2-5/16" Ez latch coupler like the # DM14040-81. The Demco coupler is 2-7/8" wide on the outside so it will undoubtedly fit with the Trimax lock, which is more or less universal. That being said, if you need a lock for the Demco EZ latch, I recommend the InfiniteRule Lock # IR66FR which is made specifically for the 2-5/16" Demco EZ Latch couplers so it will be a perfect fit.
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  • Will The InfiniteRule Lock for Demco eZ-Latch # IR56FR Fit Both 2 and 2-5/16 Couplers?
    The InfiniteRule Lock for Demco eZ-Latch # IR66FR will fit 2" and 2-5/16" couplers. This lock has an internal length of 2-15/16" to fit the pin hole on your coupler. I have linked an image below showing it on a 2-5/16" coupler in our shop.
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    Image 1 for
  • Pin Lock For Demco Cast Head Coupler DM37ZR
    There is indeed a pin lock for the Demco Cast Head Coupler w/ Jack Hole - eZ-Latch - 2" Ball # DM37ZR. In fact, there is one made specifically for this coupler, from InfiniteRule: - InfiniteRule Lock for Demco eZ-Latch Trailer Couplers # IR66FR Not only is this lock made for this coupler, but it is also extremely strong, with a tested shear strength of 42,000 lbs.
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  • Keyed Alike Trailer Coupler Lock for Demco EZ-Latch Coupler System
    Thanks for reaching out, Tripp! To get multiple locks keyed alike that are compatible with the Demco EZ-Latch you'll need to go with our etrailer Surge Brake Coupler Lock # e98888 - just be sure to choose the "keyed alike" option from the drop down menu prior to placing your order. The InfiniteRule Lock for Demco EZ-Latch Trailer Couplers # IR66FR you were looking at is keyed unique so we don't have a way to get that specific lock keyed alike for you.
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  • Lock For Demco Trailer Coupler With eZ-Latch
    Thank you for your purchase of the Demco Channel Tongue Trailer Coupler - eZ-Latch. The diameter is 5/16" and the lock that is designed specifically for Demco couplers with the eZ-Latch is the following: - InfiniteRule Lock for Demco eZ-Latch Trailer Couplers # IR66FR
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  • Will the Master Lock Trailer Coupler Lock ML389DAT DEMCO EZ Latch 2-5/16 Ball & Gooseneck Coupler?
    Yes, and no but I have one that'll do both. The Master Lock Trailer Coupler Lock item # ML389DAT you were looking at will fit a Demco A-Frame Coupler with EZ Latch item # 12660-97SP but not gooseneck couplers. For a coupler lock that does both you'll need the InfiniteRule Lock for Demco eZ-Latch Trailer Couplers item # IR66FR.
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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Michael B
Installed by:
Michael B
Employee Jameson C
Expert Research:
Jameson C
Employee Wilson B
Updated by:
Wilson B
Employee Sabrina W
Written by:
Sabrina W

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