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  1. Trailer Tongue Lock
  2. AMPLock
  3. Fits 2 Inch Ball
  4. Surround Lock
  5. Keyed Unique
  6. Cast Iron
AMPLock Trailer Coupler Lock for Flat Lip 2" Ball Couplers - Ductile Cast Iron

AMPLock Trailer Coupler Lock for Flat Lip 2" Ball Couplers - Ductile Cast Iron

Item # AMP64FR
Our Price: $265.00
Trailer Tongue Lock
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Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits standard 2" ball couplers with flat lips. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes. Great Prices for the best trailer tongue lock from AMPLock. AMPLock Trailer Coupler Lock for Flat Lip 2" Ball Couplers - Ductile Cast Iron part number AMP64FR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (95)
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  • Videos (1)
  • Photos

AMPLock Trailer Tongue Lock - AMP64FR

  • Fits 2 Inch Ball
  • Surround Lock
  • AMPLock
  • Keyed Unique
  • Cast Iron
  • Universal Application Lock
  • Flat Lip Style

Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits standard 2" ball couplers with flat lips. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes.


  • Tamper-resistant, sturdy lock deters trailer theft by preventing hookup
    • Fits over coupler, engaging it like a trailer ball does and blocking the ball opening
    • Prevents would-be thieves from hitching your trailer to their tow vehicle
  • Push-and-lock cylinder locks without the need for a key
    • Lock's location on bottom makes it difficult for thieves to access
  • Rotating-disc-tumbler lock provides maximum security
    • Nearly a million possible key codes
    • Resistant to picking and drilling
  • Heavy-duty ductile cast iron construction
    • Absorbs shock to prevent breaking
    • Resists any kind of cutting, including cutting with a torch or liquid nitrogen
  • Molded fit with swivel design decreases hold options for thieves
  • E-coat finish resists corrosion
  • 2 Keys included


  • Application: standard ball couplers for 2" ball
    • Coupler must have flat lip
    • Maximum coupler width (including lip): 4"
    • Maximum lip thickness: 3/8"
    • See below for examples of couplers this lock will work with
  • 5-Year limited warranty

Coupler Fits:

This lock fits 2" ball couplers with a flat lip. Examples of some of the couplers it fits are pictured below.

BRP-2 coupler applications

Secure Locking Mechanism

This coupler lock has a disc tumbler locking mechanism. Unlike locks that use vulnerable spring-loaded pins, this ultra-secure lock is bump-proof. The cylinder has a series of rotating discs that can be correctly lined up only when you turn the corresponding key. Two identical notched keys are included to operate the lock. Because these keys feature 1 of nearly a million possible key codes, it's extremely unlikely that another individual will have a key that can open this lock.

U-BRP-2 AMP Lock Trailer Coupler Lock 2" Ball Couplers with Straight Lip - Ductile Cast Iron

Video of AMPLock Trailer Coupler Lock for Flat Lip 2" Ball Couplers - Ductile Cast Iron

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for AMPLock Flat Lip 2 inch Ball Coupler Trailer Coupler Lock Review

What's up everybody. It's AJ, with Today, we're gonna be checking out this amp lock, coupler lock, and this is going to be good for those flat lip trailers on the front and with a two inch coupler. So, you're going to be able to put this on the front of your trailer, lock it up, and you can see it's blocking anybody for messing with the front here on this coupler. The ball is actually in there, blocking that space, and you can't get a tool in there to mess with that or even hook it up to a trailer. It's nice and secure when you're not around.

Let's check it out. So now, the lock comes in two different pieces. So we got this part, which is the two inch ball, that's going to go up in the coupler and fill this whole space, which is good because that's what sets it apart from the other locks. Sometimes they just have a pin that goes in there or just a little covering. This is going to fill up that entire space just like it would, if you we're hooked up to your truck.

That way, again, like I said, you can't get any tools in there or force anything in there to try and tow it out. So then, with that in there, you put it in the second piece and this is where that flat lip is going to fit in. Just push it on like that. And then we can push in the cylinder at the bottom. That's locked in place.

Look, in the bottom down here, you got a rotating disc coupler, and that's going to be the way it locks up and it's going to be resistant to drilling and lock-picking. Now, it comes with two keys. And then all you gotta do, is go under here, wind it up, rotate it until the cylinder comes out, just like that. And that's what makes it unlock. Looking out the side, this portion is going to be cast iron.

So it's going to be shock-absorbent. That means if you we're to hit with a hammer, it would be able to absorb that force, and not cause any problems. One thing I'd probably add though, is if you're going to go through the trouble of getting a lock and put it on your coupler, I would go and get a locking pin for here, for the coupler release. So you're gonna put that through here and have the lock on that side. We have plenty of those on the website. I would look at one of those just to go ahead and lock this up, lock this up, that way nobody can mess with any of it. You're gonna want to make sure this fits on your trailer coupler before you get it. So, to explain that, it's going to go and fit on trailer couplers with up to four inches. And it's going to fit on the thickness of three eights of an inch. Overall, I think it's worked great for your trailer. Never hurts to add that extra theft to turn on there like this lock. It's going to be on the front. Somebody walks by and they're more likely to look at that and go, "I'm not going to mess with it." Move on to the next trailer. But I think that does it. Thanks for hanging out and I hope this helped!.

Customer Satisfaction Score:

Customer Reviews

AMPLock Trailer Coupler Lock for Flat Lip 2" Ball Couplers - Ductile Cast Iron - AMP64FR

Average Customer Rating:  4.8 out of 5 stars   (95 Customer Reviews)

Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits standard 2" ball couplers with flat lips. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes.


Nice trailer lock, its expensive but if some one steals the boat it would be very in expensive then. :)


I had a friend recommend this to me a year ago. Excellent lock for securing my car hauler! I recommend this to anyone that needs a trailer lock.


Great heavy duty lock. Have put it on at every stop, we feel secure leaving our home knowing it’s not going anywhere. The lock hole being on the bottom of the unit is a bit of a pain at times but would also make it harder for someone to pick it. Over all I am happy with my purchase





Good tight fit, tough construction, and a disk core. It has sat out in the elements it's whole life and the lock still spins like new. I did drop the ball portion with the key still in it and it bent the key. That's my fault though. I Like the lock.


Impressive lock. Well machined.
I was
disappointed I couldn’t engage ball with the hitch ball clamp assembly after the flange lock was installed.


This is a nice lock, but there is plenty of room between the lip of the lock and the body of the trailer coupler for a prybar to be used. The coupler does have quite a bit of 'play' when installed - probably because it is a universal lock and as such it is designed to accommodate the dimensional differences between coupler manufacturers. Overall, the quality is very nice, and I have some ideas regarding how to 'tighten' up the fit between the lock and the coupler via shims. The manufacturer should consider including some shims - which could be used to provide a better fit between the lock body and the coupler.


Trailer still where I parked it. This lock is doing its job.


It is a little large for my 2", it fit my trailer with a 2 1/2" coupler, I wouldn't get another one.


Kate was extremely professional and knowledgeable about the trailer coupler lock that I needed. She was very efficient and helpful in placing the order and when the lock arrived it fits perfectly. It is on my trailer right now and is exactly what I needed thanks to Kate and her performance. Give her a big monetary raise and recognition before her peers.


This is the best trailer tung lock I have ever used. Heavy duty, well built, with a very unique key system that was well thought out. YES, I would highly recommend the AMP LOCK SYSTEM FOR YOUR TRAILER. YOU WONT BE DISAPPOINTED.


Does its job as advertised. I leave this trailer on construction sites, and no attempted thefts yet.


Heavy duty and very well made. No one's going to get it off!


I have a car hauler with 2 inch receiver rolled lip. This coupler lock has what I wanted. It should prevent the opportunitistic thief from taking trailer.its a solid lock . I leave a trailer off-site so it's just added insurance. It will take some grinding to get off. Key is heavy and solid so shouldn't break in lock. Happy with purchase.


I am impressed with the quality of the lock. The day we put it on in Buffalo, our sons bikes were stolen out of his garage. We were parked right in front of it. We were happy to have had it on.


AMPLock coupler lock is fantastic. Used daily. Very well made, strong and def trust regularly to keep my trailer safe.


Easy to use. Heavy duty. Seems very sec ure.


Fit and finish are perfect Fits the Demco no lip 25K


The lock is heavy duty and great. But it DID NOT work on my 2022 Jayco Micro. The lock mechanism needs to be about ?” shorter to clear the lower lip of the trailer hitch. e trailer wanted a 20% restocking fee plus for me to pay for shipping since I was outside my return window. The trailer was in for service so I could not test it out before the return policy ended. So I am either going to sell it or try to modify it myself.I would not buy it again for my 2022 Jayco.


This lock is a solid and hefty piece of equipment. Make sure to get the right model for your set-up. The width of the lip on my trailer was 3.75” and the lock fits like a glove.


the product is as advertised. expensive but much more heavy duty than any other I looked at before buying. the info on the website was helpful also.


This AMP Lock Trailer Coupler Lock might be expensive but you get what you pay for here I believe. I have purchased 3 of these based on what I believe to be a quality product.

by: 03/07/2024

great lock

Show More Reviews

See what our Experts say about this AMPLock Trailer Tongue Lock

  • AMPLock Trailer Coupler Lock For Demco 2" EZ Latch Couplers
    As long as your 2" Demco coupler does not have the edge lip like the Demco Cast Head Coupler # DM37ZR then you will be able to use the AMPLock Trailer Coupler Lock for 2" Ball Couplers w/o Lip # AMP54FR. If your coupler is more like the Demco Trailer Coupler # DM14976-52 with the lip you will need the AMPLock Trailer Coupler Lock for Flat Lip 2" Ball Couplers # AMP64FR
    view full answer...
  • How to Tell if AMPLock Trailer Coupler Lock Will Fit Trailer Coupler
    Great question! The AMPLock Trailer Coupler Lock # AMP44FR works for couplers that connect to a 2-5/16" hitch ball and the coupler has a flat lip design. This is pretty standard for trailer couplers but I'm also linking a review video of this coupler lock for you to check out. If you take note at the start of the video you'll see the flat lip design I was talking about. If you have the flat lip coupler but you use a 2" hitch ball to tow then you can use the part # AMP64FR instead. This...
    view full answer...

Info for this part was:

Employee Andrew K
Installed by:
Andrew K
Employee Lindsey S
Written by:
Lindsey S
Employee Chris R
Video Edited:
Chris R
Employee Aidan B
Video by:
Aidan B

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