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Blaylock Total-Encasement Coupler Lock for 2-5/16" Bulldog Collar-Lok Couplers - Push Button

Blaylock Total-Encasement Coupler Lock for 2-5/16" Bulldog Collar-Lok Couplers - Push Button

Item # BLTL-23
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Trailer Coupler Locks
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Blaylock Industries Fits 2-5/16 Inch Ball Trailer Coupler Locks - BLTL-23
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Can be keyed alike with other Blaylock push-button locks. Sturdy, rustproof aluminum lock discourages towaway trailer theft by fully enclosing your Bulldog Collar-Lok coupler that fits 2-5/16" hitch balls. Lowest Prices for the best trailer coupler locks from Blaylock Industries. Blaylock Total-Encasement Coupler Lock for 2-5/16" Bulldog Collar-Lok Couplers - Push Button part number BLTL-23 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (6)
  • Q & A (8)
  • Videos (2)
  • Photos
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Blaylock Industries Trailer Coupler Locks - BLTL-23

  • Fits 2-5/16 Inch Ball
  • Surround Lock
  • Blaylock Industries
  • Keyed Unique
  • Universal Application Lock
  • Aluminum

Can be keyed alike with other Blaylock push-button locks. Sturdy, rustproof aluminum lock discourages towaway trailer theft by fully enclosing your Bulldog Collar-Lok coupler that fits 2-5/16" hitch balls.


  • Coupler lock deters theft of your trailer with a Bulldog Collar-Lok-style coupler
  • Heavy-duty shell fully encloses the coupler
  • Steel pin slides up into hitch ball opening to prevent removal of lock
  • Push-button lock secures unit to trailer coupler
    • Located on front of unit for easy access
    • Recessed tumbler provides extra security measure
  • Keyed-alike option - select "Keyed Alike" to order multiples of this lock keyed alike or to key the same as other push-button-style Blaylock locks
  • Aircraft-grade, lightweight aluminum construction is strong and resists wear and corrosion
  • 2 Keys are included
  • Made in the USA


  • Application: 2-5/16" Bulldog Collar-Lok-style couplers
  • Overall dimensions: 4" long x 4" wide x 5" tall
  • Pin diameter: 5/8"
  • Weight: 2 lbs

After it has been secured in place, the Blaylock total-encasement lock renders your trailer's 2-5/16" Bulldog Collar-Lok-style coupler inoperable, ensuring peace of mind. Simply slide the lock over your coupler, push the 5/8" diameter pin into the coupler's hitch ball recess, and push in the lock mechanism. Your coupler is now completely surrounded. The sturdy steel pin extends to the top of the recess, and the pin cannot be accessed while the unit is locked.

TL23 Push Lock 2 5/16" Bulldog Collar Lock Coupler Lock by Blaylock Industries

Video of Blaylock Total-Encasement Coupler Lock for 2-5/16" Bulldog Collar-Lok Couplers - Push Button

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

Video Transcript for Blaylock Industries Trailer Coupler Locks - Surround Lock - BLTL-23 Review

Today were going to review part number BLTL-23. This is the Blaylock Total Encasement Trailer Coupler Lock and this fits 2-5/16 Bulldog Collar-Lok Couplers. This coupler lock will prevent theft of your trailer. It has a heavy duty shell that just fully encloses your Bulldog Collar-Lok Style Coupler. It has a highly visible lock which is daunting to would be thieves. It is a simple installation.

Theres no drilling required. Basically you have your lock here, it comes with two keys. Basically if you just open it, this pin will drop down. Its an integrated 5/8-inch diameter steel pin. Basically what that does is when you put the coupler in here this pin will slide up and into the hitch ball recess of the coupler.

Then when you just push your lock in, that will lock that pin into place which will secure the unit to the trailer coupler. Again, the lock has two keys which are included. This part is built of an aircraft aluminum construction. It is strong and resists wear and corrosion. The trailer coupler is safeguarded from the elements and from damage caused by impact.

This part is made in the USA. Again, this lock will fit most trailers with 2-5/16 Bulldog Collar-Lok Style Couplers. Just to give you an idea of the Bulldog Collar-Lok Style Couplers, I have one here for an example. This is one here and when they mean Collar-Lok basically what that means is it has collar here which is spring loaded, it will lock over your hitch ball. Basically if you pull up on this latch and if you watch the Collar-Lok will open up.

Theres a spring in here that will pop open that will go over the hitch ball. Thats whats defined as the Collar-Lok. If you push it back in and then release it, it locks it over the hitch ball. Basically, how this would work, I want to show you how this lock would go on to--angle it up here so we get the lock on it. Basically this would be the coupler that would be on your trailer, so what you want to do is go ahead and unlock it which will allow that pin to drop down. It will allow it go over. If you just push up on that pin, and then push it on the lock like that, that pin will be up in the recess of the coupler. That will keep this whole shell over the trailer coupler which will prevent anybody from hooking it onto their hitch ball and towing it away. This Blaylock has a Total Encasement Lock which will render your trailers coupler inoperable. As I said, you just simply slide it over the lock of your coupler. Push the pin up and your coupler is now surrounded. The pin cannot be accessed while the unit is locked, as you could see underneath there. I do want to give you a few dimensions on this. Well go ahead and remove it. The overall height on this will be 5 inches tall, width will be 4 inches by 4 inches. That should do it for review on part number BLTL-23.

Customer Reviews

Blaylock Total-Encasement Coupler Lock for 2-5/16" Bulldog Collar-Lok Couplers - Push Button - BLTL-23

Average Customer Rating:  4.2 out of 5 stars   (6 Customer Reviews)

Can be keyed alike with other Blaylock push-button locks. Sturdy, rustproof aluminum lock discourages towaway trailer theft by fully enclosing your Bulldog Collar-Lok coupler that fits 2-5/16" hitch balls.

- BLTL-23

Looks like a great product, but it does not fit my hitches on my trailers. My trailers have the extra flange around the ball area and this will not fit. I really like the lock though and might use it for something else. 255474

- BLTL-23

Barely fit on the hitch but I lubbed it up and managed. It works well for me because the rv is stationary. Wouldn’t work for someone needing to get it on and off often. Made in the USA ?? 552058

- BLTL-23

Did not fit over my bulldog coupler. etrailer.com was of course good about a prompt RMA. 160991

- BLTL-23

Awesome Service..! Great Product..! 290482

- BLTL-23

I ordered the wrong size but etrailer shipped me the right one quickly and I returned the first. What a great product and etrailer is a great company. I'm a customer for life! 274007

- BLTL-23

great lock 60448


Ask the Experts about this Blaylock Industries Trailer Coupler Locks

  • Coupler Lock for 2-5/16" Trailer Coupler Ball
    We do not have any type of database of parts lists on each year, make and model of trailer so while we cannot tell you what type of coupler you have on your 2005 Airstream there are universal applications that should work. I recommend checking out the Master Lock Trailer Coupler Lock # ML389DAT which will work on your Airstream if you have a standard lip, rolled lip, straight lip, surge brake, hammer blow or UFP couplers. If you take a look at the accompanying photo you can see how...
    view full answer...
  • Inside Width of Blaylock Total Encasement Coupler Lock # BLTL-23
    The inside width of the Blaylock # BLTL-23 is 3-1/4 inches, as you can see in the photograph I've edited for you. I don't know which website you're referring to, but the information is incorrect.
    view full answer...
  • Securing Steel Coupler To Aluminum Car Hauler Trailer Tongue To Prevent Theft
    Thanks for the photo of your trailer coupler. That really helps explain what you are asking about. I spoke with a couple of other Experts and we may have a couple options you can consider. One way to go is to use Loctite Threadlocker 262, part # LT37420 on the coupler bolt threads. This is put on the threads when bolting the coupler to the trailer tongue and becomes impossible to remove with hand tools without heating it up to 500F degrees to free the parts for disassembling. That would...
    view full answer...
  • Coupler Lock Recommendation for a Bulldog Collar Lok Coupler
    What you need is the # BLTL-23 as it has been confirmed as a fit for your coupler. I attached a review video for you to check out.
    view full answer...
  • Recommended Trailer Coupler & Wheel Locks
    The best type of lock for your Bulldog adjustable 2-5/16-inch trailer coupler depends on the coupler design. If you have a Bulldog Collar-Lok Coupler like # BD028585 then I would go for the Blaylock Total-Encasement Coupler Lock # BLTL-23 over the Fastway # DT25013KA simply because it fully surrounds the coupler. Deterrent value is high! If you have other trailers to lock then in that case the flexibility of the Fastway could make it your better option. For just this one trailer, go for...
    view full answer...
  • Lock Recommendations for a Collar-Lok Style Trailer Coupler
    It sounds like you have a Collar-Lok coupler such as # BD028244. For that type of coupler you could use lock # BLTL-23. The body is aluminum but the pin inside that goes way up into the coupler is steel. It fits 2-5/16 inch Collar-Lok couplers. For 2 inch models use # BLTL-22. Another option, if your coupler has the pin behind the collar to keep the collar from sliding back, is to use a lock such as # e98888 in place of the pin. This would prevent the collar from opening all the way....
    view full answer...
  • Locks for 2-5/16-Inch Coupler on Travel Trailer
    We offer many styles of locks for 2-5/16-inch trailer couplers and all of them are shown on the linked page. All are the surround type lock and we have some that fit all coupler sizes, such as the Fastway Universal Trailer Coupler Lock # DT25013KA. For a lock specific to a 2-5/16-inch coupler that completely encases the coupler you might consider the Blaylock # BLTL-23.
    view full answer...
  • Recommendation for a Coupler Lock for a Collar-Loc Trailer Coupler
    Master Lock coupler lock # 3784DAT is not the best option for a Collar-Lok coupler. For a Collar-Lok coupler I recommend a lock designed for then such as # BLTL-23 (2-5/16 inch ball), # BLTL-20-40D (1-7/8 to 2-5/16 inch balls), or # BLTL-22 (2 inch ball).
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Adam R
Expert Research:
Jeffrey L
Installed by:
Jeff D
Installed by:
Robert C
Written by:
David L
Video by:
Dustin K
Video Edited:
Zach D

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