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

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

Item # AMP56FR
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Our Price: $199.43
Trailer Coupler Locks
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Shipping Weight: 8 lbs
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AMP56FR - Keyed Unique AMPLock Surround Lock
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Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits 2-5/16" underslung ball couplers. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes. Lowest Prices for the best trailer coupler locks from AMPLock. AMPLock Trailer Coupler Lock for Underslung 2-5/16" Ball Couplers - Ductile Cast Iron part number AMP56FR can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (13)
  • Q & A (0)
  • Videos (1)
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  • Why etrailer?

AMPLock Trailer Coupler Locks - AMP56FR

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

Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits 2-5/16" underslung ball couplers. 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
  • E-coat finish resists corrosion
  • 2 Keys included


Specs:

  • Application: underslung ball couplers for 2-5/16" balls
    • Maximum coupler width (including lip): 4-3/4"
    • Maximum lip thickness: 2-7/16"
  • Lock pin diameter: 7/8"
  • 5-Year limited warranty


Coupler Fits:

This lock fits underslung 2-5/16" ball couplers. An example of a coupler it fits is pictured below.


2516i coupler application

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-TLS2516I AMP Lock Coupler Lock for Underslung 2-5/16" Ball Couplers - Ductile Cast Iron





Video of AMPLock Trailer Coupler Lock for Underslung 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 Review of AMPLock Trailer Coupler Locks - Underslung Ball Coupler Lock - AMP56FR

Hi there, I'm Michael with etrailer.com. Today, we're gonna take a quick look at this AMPLock trailer coupler lock. This is a nice heavy-duty cast iron coupler lock that's going to help prevent your trailer from being stolen. This does fit over your 2 5/16 inch underslung ball coupler. It engages the coupler, just like a trailer ball would. So it's going to help block that ball opening to prevent any would-be thieves from hooking up to your coupler.

And this is going to work with your couplers that have a maximum width, including the lip, of 4 3/4 inch and a maximum lip thickness of 2 7/16. So if that describes your underslung coupler, this is gonna be a great option for you. This does have a rotating disc tumbler lock that's gonna provide maximum security for you. So you just twist that key. That's going to allow that 7/8 inch diameter lock pin to slide down, and then you can take the key out and it will slide up even without the key there.

So, very easy to get installed. This is going to resist picking and drilling. So it's gonna hold up really well for you for even against determined thieves. And there are nearly a million different possible key codes for this, so it's extremely unlikely that anyone else is gonna have the same key for you. So even if they have the same lock, they won't be able to come along and open this up.

But you do get the two keys included, so you wanna make sure that you keep track of those. The cylinder is going to be mounted on the bottom there, so that's going to make it much more difficult for thieves to access, and it's gonna help to keep everything where you need it to be. Because this does have that heavy duty ductile cast iron construction, it's gonna absorb shock to prevent breaking. It's going to resist any kind of cutting, including cutting with a torch or liquid nitrogen. And it does have this e-coat finish that's gonna resist corrosion.

So again, it's going to last a nice long time. be a great theft deterrent to prevent people from hooking up to your trailer and taking off with it. So that's going to complete our look for today. Again, I'm Michael with etrailer.com. Thanks for watching..


Customer Reviews

AMPLock Trailer Coupler Lock for Underslung 2-5/16" Ball Couplers - Ductile Cast Iron - AMP56FR

Average Customer Rating:  4.9 out of 5 stars   (13 Customer Reviews)

Use this heavy-duty cast iron coupler lock to help prevent trailer towaway theft. Fits 2-5/16" underslung ball couplers. Resists picking, cutting, drilling, and freezing. Tumbler offers nearly 1 million possible key codes.

- AMP89FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


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.



- AMP29FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


These locks are such heavy duty locks that when we lost the key to our first one, we had to hire a locksmith to get the lock off. It was no easy task even for him! Ordering a second lock was easy, customer service is excellent and shipping prompt. I highly recommend this lock if safety of your work vehicles are a priority for you!



- AMP74FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


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.



- AMP44FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


Fits as described. Very solid. I feel like my trailer is definitely secure.



- AMP89FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


these are the best locks ever and locks can be keyed the same.



- AMP89FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


well made. works very smooth. strong.



- AMP74FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


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.



- AMP84FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


Nancy was great. I’ll give her 5 stars too!!



- AMP74FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks


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



- AMP74FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks




- AMP89FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks




- AMP74FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks




- AMP64FR
by:

Review from a similar AMP Trailer Coupler Lock in Trailer Coupler Locks



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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Michael B
Installed by:
Michael B

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