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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 2" Ball Couplers w/o Lip - Ductile Cast Iron

AMPLock Trailer Coupler Lock for 2" Ball Couplers w/o Lip - Ductile Cast Iron

Item # AMP54FR
Our Price: $347.00
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 no 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 2" Ball Couplers w/o Lip - Ductile Cast Iron part number AMP54FR can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (95)
  • Q & A (0)
  • Videos (1)
  • Photos

AMPLock Trailer Tongue Lock - AMP54FR

  • Fits 2 Inch Ball
  • Surround Lock
  • AMPLock
  • Keyed Unique
  • Cast Iron
  • Universal Application Lock
  • Cast Style
  • Sleeve-Lock Style

Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits standard 2" ball couplers with no 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 can't have a lip
    • Great for use on standard straight tongue couplers with a lever latch, Dexter Drop-n-Go actuators, Bulldog collar-lock couplers, and more (see below for more examples)
  • Inner width: 3-1/2"
  • Inner height: 4-13/16"
  • 5-Year limited warranty

Coupler Fits:

This lock fits 2" ball couplers without a lip. Examples of some of the couplers it fits are pictured below.

BRA-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-BRA-2 AMP Lock Trailer Coupler Lock for Lipless 2" Ball Couplers - Ductile Cast Iron

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

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

Video Transcript for AMPLock Ball Couplers without Lip Trailer Coupler Lock Review

What's up everybody It's A.J, with Today, we're gonna be checking out this Amplock coupler lock, and it's gonna be a coupler lock that goes over your two-inch coupler. And it works with them when they don't have a lip. So you can see this one has no lip, no raise, or rolled, or flat lip here. So it's gonna slide over that and lock it up. Let's check it out.

So we're gonna take the ball, the first section, and just put it up there, it's gonna latch into place, you don't have to worry about holding that with your other hand, and we'll come back with this portion. We're gonna put this cylinder in this hole in the ball, slide into place on the bottom side. And the nice part is I don't have to have the key in place. I can just push that in, it's real easy to push, and now it's all locked up. Now, something you might be wondering is if I can just pull this latch, is it gonna pop right out That's not how it works.

It still stays in place, so you don't have to worry about somebody doing that, just to pop this back off. You see, as I move around, there's a little bit of a gap there on the back side. You're not just ever gonna eliminate that completely. But let me get a pry bar and see how much space is actually in there. So I can try and get in here on the side.

I can fit the whole pry bar in there and push on it a little bit. So there is room for that to get in there, but I think that this is pretty much there. It's gonna scare off anybody from messing with it, just to see this design, how everything's completely covered that, and the ball is up in the coupler, so you can't just get the pry bar easily up in there to throw anything. I think it's just gonna deter people just by looking at it. They're gonna move on to the next trailer.

Looking at the lock down here, I'm just gonna show you the cylinder lock. It's going to be really good because it's resistant to drilling or picking, or anything like that because of the way it turns and pops out. It's really easy to unlock it like this. This is in the unlocked position, and you saw earlier, it's just a push of button, even without the key. Let me pull the key out of there real quick. It's really easy to lock it right back up with an easy push of the button. I like that with the cylinder lock. Now that, in combination with the cast iron design outside here, you don't have to worry about the elements messing with this. It's not gonna rust or corrode, and it's gonna absorb a shock. So if somebody was gonna try and hit it with a hammer, it would absorb that hit and they wouldn't be able to do anything with it. The cast iron design is gonna be pretty thick, too. You can see looking on the inside the thick parts up there. So if somebody is going to try and cut it, it's pretty cut resistance in the first place. But if they tried it, it would take 'em a while and make a lot of noise, so I think they're just gonna move on and go to a trailer that doesn't have one of these. And the other thing we look at is, the current trailer you have, you might want to do some measurements. It's gonna have a maximum width of three and a half inches here on the inside, and then the maximum height will be 4 13/16. So just make sure your coupler is gonna work with this before you get it. Overall, I think it's going to be very helpful to have this on the front of your trailer, on your coupler. Like I've said a few times, people are gonna take one look at it, see all the coverage it has and the lock and just go, "I'm gonna go to the next trailer. I'm not even gonna mess with that beast." That about does it. Thanks for hanging out. And I hope this helps..

Customer Satisfaction Score:

Customer Reviews

AMPLock Trailer Coupler Lock for 2" Ball Couplers w/o Lip - Ductile Cast Iron - AMP54FR

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 no lips. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes.


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.


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


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


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.


Nice lock for my Air Stream Bambi, just what I needed, between this lock and my new wheel chuck locks from it should not get stolen again. thanks Etrailer for my new lock setup.!


Has worked flawlessly for over a year stored outdoors in Chicago. Finish seems to be holding up and the action still works smooth. This is a very robust design that would be difficult to defeat.


Solid made, would be very very time consuming to overcome this lock , The lock cylinder is on the bottom, is harder to get to for locking and unlocking, That's ok is harder for thief to overcome it, This lock is well made and very heavy, Im glad to have this.


Heavy duty item! It is a little looser when installed than I thought it would be but I understand it fits many different hitch types. Even though it does fit a little loose in my opinion, in no way would anyone be able to get it off!

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...
  • AMPLock Trailer Coupler Lock Suggestions For A 2022 Jayco Jayfeather 25RB
    Depedning on what your trailer has we may have what you need. If your trailer has an underslung 2-5/16" ball coupler # AMP56FR is a great option. -If you have a flat lip 2" ball coupler, then the AMPLock Coupler Lock for Flat Lip 2" Ball Couplers # AMP89FR is a great option. -If you have a rolled lip 2" or 2-5/16" ball coupler, then the AMPLock Coupler Lock for Rolled Lip 2" or 2-5/16" Ball Couplers # AMP29FR will work great. Finally, if you have a 2" ball coupler without a lip, the...
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  • Recommended Lock for 2 Inch Lipless Cast Coupler While Towing and Unhooked
    For a lock for your lipless cast coupler I recommend the Blaylock EZ Lock Trailer Coupler Lock for 1-7/8", 2", and 2-5/16" Couplers - Aluminum # BLTL-33-40D. This lock has 3 pin hole positions for a tight fit on a variety of couplers and uses a stainless steel padlock with a hardened steel shackle to secure the pin in place. The aluminum construction will help resist wear and corrosion. If you would prefer a high-end lock that is specifically made for couplers without a lip, we also have...
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  • How to Know if AMPLock Trailer Coupler Lock Will Fit on Coupler
    Hey Paul, thanks for reaching out! The tongue lip that the AMPLock Trailer Coupler Lock # AMP54FR is talking about is a ledge (for lack of a better term) that sits out around the coupler. I'm attaching a photo you can use as an example.
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Info for this part was:

Employee Andrew K
Installed by:
Andrew K
Employee Lindsey S
Written by:
Lindsey S
Employee Jacob T
Video Edited:
Jacob T
Employee Michael B
Updated by:
Michael B
Employee Aidan B
Video by:
Aidan B

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