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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 Flat Lip 2-5/16" Ball Couplers - Ductile Cast Iron

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

Retail:$475.88
Our Price: $265.00
You Save: $210.88
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 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 2-5/16" Ball Couplers - Ductile Cast Iron part number AMP74FR 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

  • 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 flat 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
    • Includes key blank with key number


Specs:

  • Application: standard ball couplers for 2-5/16" balls
    • Coupler must have flat lip
    • Maximum coupler width (including lip): 4-9/16"
    • Maximum lip thickness: 7/16"
    • Great for use on couplers with the Demco composite EZ Latch, A-frame couplers with thumb latches, flat mount couplers, and more (see below for more examples)
  • 5-Year limited warranty


Coupler Fits:

This lock fits 2-5/16" ball couplers with a flat lip. Examples of some of the couplers it fits are pictured below.


BRP-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-BRP-2 5/16 AMP Lock Trailer Coupler Lock 2-5/16" Ball Couplers with Straight Lip - Ductile Cast Iron

Item # AMP74FR





Video of AMPLock Trailer Coupler Lock for Flat Lip 2-5/16" 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 2-5/16 inch Ball Coupler Trailer Coupler Lock Review

What's up everybody, it's AJ with etrailer.com. Today we're gonna be checking out the AMP lock two and five sixteen ball flat lip coupler lock. So this is going to go right here on the coupler, on the front of your trailer. And it's going to keep anybody from pulling here and hooking it up to your trailer and taking it when you're not around. What sets apart this lock from other ones is some of the ones just have like a little tab that's going to cover up the coupler. And that can be pried out with a tool, or you can get around that.

This ball goes all the way up in here. It takes up all that space. So it's going to be hard to even get a tool in there and you're not going to be able to hook up anything else to it. So that's that extra protection and you have the cast iron part here. That's going to go over the lip of the trailer.

So you can see this groove here is exactly for that. And this is going to fit right there in the ball, put into place. You can just push the cylinder at the bottom and it's locked in. You're gonna get two keys with it. That way you can put one on the key ring, leave one in your truck just in case you lose it.

And you got a rotating disc tumbler lock here at the bottom. So that's going to be resistance to drilling or anybody trying to pick it, they're not going to get through to it. It's really easy. We just put the key in there turn and the cylinder will drop down. They know it's unlocked.

So right now it's unlocked so I can remove the key and then slide it off. Outside you have the cast iron portion that goes over the flat lip here on the coupler and that's going to be shock absorbent. So even if somebody was going to hit it with a hammer or something it's going to be able to absorb that punishment and not get destroyed. In addition to our coupler lock I would recommend getting a coupler latch lock. This is going to go right in here and lock this up. That way nobody can mess with this or this. We have them on our website. So just look for a coupler latch lock. The maximum width of the coupler with a flat lip is going to be four nine sixteen". Now the maximum thickness of that lip is going to be seven sixteenth of an inch. The other thing to point out is the ball itself is only going to fit two and five sixteen" couplers. Overall I think is going to be very useful to have just seeing this on the front of the trailer is going to keep people from messing with it. They're just going to see that and move on to the next one. If they want to mess with something but otherwise it will be locked up. You got all that protection there and nobody can hook up or even really pry out on it. So it's going to keep your trailer protected. I think that does it. Thanks for hanging out. I hope this helped..

Customer Satisfaction Score:


Customer Reviews

AMPLock Trailer Coupler Lock for Flat Lip 2-5/16" Ball Couplers - Ductile Cast Iron - AMP74FR

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 flat lips. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes.

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.

Etrailer Expert

Jenny N.

6/7/2023

I am glad you like the lock and I wanted to ask you what you meant that you are not able to engage the ball?

Peter

6/7/2023

Thanks so much for this follow up communication. The locking lever on the ball receiver will not set into its locking position around the amp lock’s ball when the amp lock is in place. The locking lever on the receiver will set into locking position around the amp ball without the amp cast iron locking collar in place. Seems the center line location of the pin located in the amp cast iron collar is a bit to close to the amp lock’s ball location for both the amp lock assembly and the locking lever on the receiver to work together. However the amp lock assembly is substantial enough to work on its own. The amp lock engages the receiver’s flange and ball opening to substantially secure the towing assembly of the trailer.



by:

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

Dan

3/29/2024

Been almost 2 years with this trailer lock. Zero issues. Works flawlessly.



by:

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



by:

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

Kenneth

4/3/2024

Lock works great. Most secure lock I have seen



by:

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:

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.



by:

Tough Lock, Heavy Duty, Well Made, Rugged.
I
do believe that this will send a potential trailer thief looking for another trailer.



by:

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!



by:

Fit perfectly. Everything I was hoping for.

Kenneth

7/30/2023

It has worked great. I feel very secure when I am gone from my travel trailer.



by:

We love it, works great!



by:

Very robust and will not be easy to tamper with.



by:

Strong and simple. It's what you need in a lock!

Timothy E.

7/12/2022

A year in...I still love it!



by:

We chose AmpLock because after thorough research we found that this was the must trusted anti-theft device for our travel trailer. We often go out and leave our dogs in the trailer while camping and we didn't want to have to worry about something happening to them should the trailer get stolen. This gives us extra piece of mind. I hope that we don't ever have to find out how well it works, but for now we are very satisfied with our purchase. It did fit perfectly and was easy to install as well.



by:

although the initial purchase is HIGH, IT IS CERTAINLY WELL BUILT TO PROTECT MY $6,000 investment, Great Quality 5 STAR



by:

It is massive and will keep your rig sa fe.



by:

Heavy built unit. Weighs 10 lbs. It’s expensive but what price do you put on the value of your trailer? They shipped it to me in 4 days.



by:

This thing is built very strong.



by:

Dan

11/15/2023

Works great best lock Ive ever bought.

Etrailer Expert

Mike L.

11/18/2023

@Dan They DO make a good lock, we're glad to hear you're happy with it!


by:

The item fit as described and it got here quick. Thanks



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Show More Reviews

See what our Experts say about this AMPLock Trailer Tongue Lock

  • Recommended Coupler Lock For A 2-5/16 Trailer Coupler
    To prevent any fitment issues with the lip of your coupler the best choice is a lock like the Reese Tow and Store Lock Kit # RP7014700. The ball will sit up inside the coupler and the latch bolt will wrap around the top of the coupler. It can fit 1-7/8", 2", & 2-5/16" couplers for a universal fit if you want to lock up different trailers. It will also come with two hitch pin locks as well as a coupler latch lock, with all locks being keyed alike so you'll only need one key.
    view full answer...
  • What Does Flat Lip Coupler Look Like for Fitment with AMPLock Trailer Coupler Lock
    Some couplers have no lip, some have one that's a little rolled, and others have a flat lip, which is where the AMPLock Trailer Coupler Lock for Flat Lip 2-5/16" Ball Couplers # AMP74FR comes into play. I'm attaching a photo one of our customers submitted that does a great job depicting the style of coupler this fits, but if you're still unsure please feel free to send in a photo and I'll be more than happy to make a recommendation for you!
    view full answer...
    Image 1 for
  • Coupler Locks For 2-5/16" Trailer Coupler With a 4-1/2" Wide Flat Lip
    We have a few options for your coupler with a 4-1/2" lip. The etrailer Trailer Coupler Lock # e98895 is a good lock. From there we move up to the better Trimax Dual Purpose Coupler Lock # TMX67FR which uses a hardened steel construction. The AMPLock Trailer Coupler Lock # AMP74FR is our best lock as it uses a cast iron construction and a rotating-disc-tumbler lock to prevent picking.
    view full answer...
    Image 1 for
  • Will the AMPLock Trailer Coupler Lock for Flat Lip 2-5/16 Couplers Work with an Underslung Coupler
    I do have an option for you but the AMPLock Trailer Coupler Lock for Flat Lip 2-5/16" Ball Couplers part # AMP74FR is designed for overslung trailer couplers. I recommend the AMPLock Trailer Coupler Lock for Underslung part # AMP56FR instead which is designed for underslung couplers.
    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 Lindsey S
Written by:
Lindsey S
Employee Chris R
Video Edited:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Aidan B
Video by:
Aidan B

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