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  1. Trailer Tongue Lock
  2. AMPLock
  3. Fits 2-5/16 Inch Ball
  4. Keyed Unique
  5. Surround Lock
  6. Cast Iron
AMPLock Trailer Coupler Lock for 2-5/16" Ball Couplers w/o Lip - Ductile Cast Iron

AMPLock Trailer Coupler Lock for 2-5/16" Ball Couplers w/o Lip - Ductile Cast Iron

Item # AMP34FR
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 2-5/16" 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 2-5/16" Ball Couplers w/o Lip - Ductile Cast Iron part number AMP34FR can be ordered online at etrailer.com or call 1-800-940-8924 for expert service.
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  • Reviews (94)
  • Q & A (0)
  • Videos (1)
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AMPLock Trailer Tongue Lock - AMP34FR

  • Fits 2-5/16 Inch Ball
  • Keyed Unique
  • Surround Lock
  • AMPLock
  • Cast Iron
  • Universal Application Lock
  • Flat Lip Style

Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits standard 2-5/16" ball couplers with no lips. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes.


Features:

  • 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


Specs:

  • Application: standard ball couplers for 2-5/16" ball
    • Coupler can't have a lip
    • Great for use on standard straight tongue couplers with a lever latch, 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 2-5/16" ball couplers without a lip. Examples of some of the couplers it fits are pictured below.


BRA-2516 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 5/16 AMP Lock Trailer Coupler Lock for Lipless 2-5/16" Ball Couplers - Ductile Cast Iron





Video of AMPLock Trailer Coupler Lock for 2-5/16" 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 Review of AMPLock Trailer Coupler Locks - Surround Lock - AMP34FR

Hello everybody, this is Jeff at etrailer.com. Today we're gonna take a look at the amp lock cast iron trailer coupler lock. For the 2 and 5/16ths ball couplers that do not have a lip on them. Now, this is a tamper-resistant sturdy lock, prevents trailer theft by preventing hookup. It is designed to fit over the coupler, engaging it like a trailer ball does and blocking the ball opening. This will help prevent any wood dehisce from hitching your trailer to the toe vehicle.

Now, this is in the lock position so I just wanna open it up and demonstrate how this works. So you just go ahead and put your key in there. And once you get your key all the way in there and you just twist it, pull out the lock, remove the key and now it'll remove the ball from the cover. The cover itself is a nice heavy duty ductile cast iron construction, helps absorb shock to prevent any breaking. And it also resists any kind of cutting, including cutting with like a torch or liquid nitrogen.

The ball that you use to lock onto is a solid one piece, stainless steel ball. Has a stainless steel pin right here, that'll lock onto the coupler. It does use that push-in lock cylinder. It'll lock without the need for a key. You can see once you open it and leave it in the open position to lock it, all you have to do is push in on that.

I'm gonna demonstrate that. And also it's nice when this is installed, the lock's location is on the bottom. So it also makes it difficult for thieves to access. Does use a rotating disc tumbler lock which will provide maximum security. It offers nearly a million possible key codes and it is resistant to picking and drilling.

So what we're gonna demonstrate, I happened to pull a coupler that does not have a lip on the front here. And it is recommended because this won't fit over the lip. Some of your couplers have like a rolled edge or a lip over here. This one, if you notice, doesn't really have a lip to it so it works perfectly on this. So what we're gonna do is take out the pin and we'll go ahead and open this so it's in the open position. Oops, there we go. It's in the open position and now we'll put the ball into there and close it. And you can see now it's locked onto the ball. And then what you'll do with this hole facing outwards, and again, we mentioned it's still in the lock, or gonna be locked, open position. You can slide this right over the whole coupler, onto the ball. And then what you'll do is just push this in just like that. And you'll hear it click, and now it's locked into place. So when this is installed, just like this on your coupler, nobody can hook up to it. Makes it very hard to access. It is a nice molded fit you can see. Has a nice swivel design to it. So that'll decrease any hold options for the thieves. Does have a nice e-coat finish on it to resist corrosion. Now it's come with the two keys. And again, we mentioned the application. This is for standard ball couplers that use a 2 and 5/16ths diameter ball. And again, just to mention it doesn't, the coupler does not have, should not have a lip on it 'cause this will only work on the couplers that do not have that lip. So again, to remove this all you have to do is take your key, put it up under there. And once you get your key all the way in there, twist it, pull out the lock, remove your key, and then that'll let you able to slide your cover off. And then you have access to your ball. Go ahead and open it and unhook it from the coupler. Simple as that. Now this is great for use on standard straight tongue couplers that have a lever latch, bulldog collar lock couplers, and many more. If you go to the product page for this part number it'll show pictures of different locks it'll work on. One of the last things I wanna do is give you some measurements on here. We're gonna measure the inner width just to give you an idea of the size of the couplers it'll fit on. So you can see right here if we go inner width, it's about 3 and 3/4 inches. The inner height is gonna be right at about, you know from there, also about 3 and 3/4 inches tall. But again, just to show you, this will go right onto there. Once it goes on, push it into place. And then now you're locked together, simple as that. But that should do it for the review on this amp lock cast iron trailer coupler lock for the 2 and 5/16ths ball couplers without a lip..

Customer Satisfaction Score:


Customer Reviews

AMPLock Trailer Coupler Lock for 2-5/16" Ball Couplers w/o Lip - Ductile Cast Iron - AMP34FR

Average Customer Rating:  4.8 out of 5 stars   (94 Customer Reviews)

Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits standard 2-5/16" ball couplers with no lips. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes.

by:

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



by: 03/07/2024

great lock



by:

I love my AMP lock. It is heavy and sec ure!



by:

This is the best I've found for a 20K Demco coupler. Easy to install, proprietary keys, really really good quality.If you see how its designed and works it'll help understand the cost.If I had a claim w the piece attached to this coupler, at least the insurance co would see I made every effort to protect my asset.Buy Once cry once. If someone gets past this to get your equipment,there was not much you could do to protect it. etrailer has done well carrying quality equipment.zero complaints.

Gps N.

10/3/2022

great



by:

Great, secure lock. Good strong key too.



by:

It's built really well! No way anyone is getting it off the trailer without a cutting torch and that would be questionable!



by: 06/01/2022

Excellent, heavy-duty product!



by:

Super great service! Fast shipping!!!
Karen
L was a huge help!!!!!



by:

This should provide the security we hope for while the trailer is parked unhitched at a horse show.



by:

Doesn't fit snug like I would have expe cted.



by:

Great product and quick fulfillment.



by:

This lock is tough! So glad I bought it. I have so much peace of mind.



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by:

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.



by:

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



by:

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.



by:

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



by:

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.



by:

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.



by:

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



by:

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


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Show More Reviews

See what our Experts say about this AMPLock Trailer Tongue Lock

  • Best Coupler Lock for Bulldog Cast Head 2-5/16 Coupler
    There are a couple of options for very high-quality coupler locks for the Bulldog cast head coupler, with the absolute best being from AMPLock: - AMPLock Trailer Coupler Lock for 2-5/16" Ball Couplers w/o Lip # AMP34FR This lock is a beast for a number of reasons, starting with its ductile cast iron construction. Ductile cast iron is just not going to be something a thief is able to cut through or smash off it is far, far too strong for that and often used in things like automotive parts...
    view full answer...
  • Lock Recommendation for Demco Coupler DM16080-95
    For the Demco Channel Tongue Coupler part # DM16080-95 that you have the AMPLock part # AMP34FR is the lock you would want as we have had people with this style of coupler send pictures of it working well on it. See attached picture. This is a very secure coupler lock that would work really well.
    view full answer...
    Image 1 for
  • Coupler Lock that Fits Demco Actuator part # DM8204311
    Yes, the Amplock hitch lock part # AMP34FR does work with the Demco Actuator part # DM8204311 that you referenced.
    view full answer...
  • Coupler Lock that Could Fit Demco EZ Latch Coupler
    The Demco EZ Latch Couplers like the part # DM16680-52 have lips on them which is why the AMPLock Trailer Coupler Lock for 2-5/16" Ball Couplers w/o Lip # AMP34FR is not going to work as it's designed for couplers without a lip. You'd want something that was designed for lips like the part # e98894 instead. This fits with lips and also with a 2-5/16 inch ball fit.
    view full answer...

Do you have a question about this Trailer Tongue Lock?


Info for this part was:

Employee Andrew K
Installed by:
Andrew K
Employee Jeff D
Installed by:
Jeff D
Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Aidan B
Video by:
Aidan B

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