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EZ Lock Trailer Coupler Lock for 1-7/8", 2", 2-5/16" Bulldog Collar-Lok Couplers

EZ Lock Trailer Coupler Lock for 1-7/8", 2", 2-5/16" Bulldog Collar-Lok Couplers

Item # BLTL-20
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Trailer Coupler Locks BLTL-20 - Keyed Unique - Blaylock Industries
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Fight back against trailer thieves with this rugged, rustproof aluminum trailer coupler lock. Simple yet effective, it deters towaway theft of your trailer that has a Bulldog Collar-Lok coupler. Padlock sold separately. Lowest Prices for the best trailer coupler locks from Blaylock Industries. EZ Lock Trailer Coupler Lock for 1-7/8", 2", 2-5/16" Bulldog Collar-Lok Couplers part number BLTL-20 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (570)
  • Q & A (18)
  • Photos
  • Used (1)
  • Why etrailer?

Blaylock Industries Trailer Coupler Locks - BLTL-20

  • Fits 1-7/8 Inch Ball
  • Fits 2 Inch Ball
  • Fits 2-5/16 Inch Ball
  • Surround Lock
  • Keyed Unique
  • Blaylock Industries
  • Universal Application Lock
  • Aluminum

Fight back against trailer thieves with this rugged, rustproof aluminum trailer coupler lock. Simple yet effective, it deters towaway theft of your trailer that has a Bulldog Collar-Lok coupler. Padlock sold separately.


  • Coupler lock deters theft of your trailer that has a Bulldog Collar-Lok-style coupler
  • Heavy-duty bracket fits around your trailer's coupler
    • Raised ball on platform sits inside of coupler
  • Steel pin slides through the bracket to secure the lock to your coupler
    • Padlock (sold separately) is required to secure pin in place
  • Aircraft-grade, lightweight aluminum construction is strong and resists wear and corrosion
  • Made in the USA


  • Application: most 1-7/8", 2", and 2-5/16" Bulldog Collar-Lok-style couplers
  • Overall dimensions: 2-1/2" long x 4-1/2" wide x 5" tall
  • Inside width: 3-3/16"
  • Pin diameter: 3/4"
  • Weight: 4-1/5 lbs

This Blaylock EZ Lock is designed to work with Bulldog Collar-Lok couplers that fit 1-7/8", 2", or 2-5/16" hitch balls. After it has been secured, this coupler lock renders your trailer's coupler inoperable, ensuring peace of mind.

With the slanted side of the lock pointing toward the front of the coupler, simply place the coupler lock's raised ball up under the coupler and into the coupler's ball hole. The sides of the lock will surround the coupler. Slide the 3/4" diameter pin through the holes in the lock and secure the pin in place with a padlock (sold separately).

TL20 Bulldog Collar Lock Coupler Lock by Blaylock Industries - Padlock Not Included

Customer Reviews

EZ Lock Trailer Coupler Lock for 1-7/8", 2", 2-5/16" Bulldog Collar-Lok Couplers - BLTL-20

Average Customer Rating:  4.8 out of 5 stars   (570 Customer Reviews)

Fight back against trailer thieves with this rugged, rustproof aluminum trailer coupler lock. Simple yet effective, it deters towaway theft of your trailer that has a Bulldog Collar-Lok coupler. Padlock sold separately.

- BLTL-20

The products sold by E Trailer is always the best and I have dealt with George for years and appreciate the fact that they look after the customers and NOT out just to make a buck, quality ownership of anything they sell.

- BLTL-20

I've used these for years Functional. Effective. I have several trailers, using my own keyed alike locks I don't have to keep up with different keys for different trailers.

- BLTL-20

Great product! Fits my trailer perfectly! I bought this item because I have my own lock to use. Would definitely recommend!

- BLTL-20

I have 10 trailers use this with master lock discus shrouded stainless steel keyed a like locks works great for us

- BLTL-20

Appears that it will do the job. It's not very complicated, clamps on hitch to make trailer stay where you park it.

- BLTL-20

This theft deterrent works just fine, super easy to use WHICH MEANS YOU SHOULD USE IT !!! Any theft system is really to stop the person that is not fully prepared to steal something. So using this is 80% of the solution to having your trailer borrowed permanently. Easy to put on and you have to use the disk style lock as this is the only lock that can't be cut into by bolt cutters. Do not use a cheap pad lock or the thieves will go at the WEAK part of the system.

Still have my trailer and wheels. Thank you for checking in.
Steve K - 01/29/2015

Is it still working for you?
-- comment by: Rory - 01/15/2016

- BLTL-20

love these. fit many trailer balls & I can use my own locks. Hole is a bit narrow for standard "Discus" locks, but 10 sec with a burr on the drill fixes that.

- BLTL-20

This is the best lock for a Bulldog Style hitch i have seen. We used this lock to integrate into our Master Lock Keyed Alike System. No more hunting up the missing key; time and money saver at work and at home. Thanks

I have been very happy with my experience with etrailer.com. Great ion, Good Reviews,Good Prices, Good Product info, Great shipping and customer service. Also, alot of the items are hard to find, its nice to have a one stop shop.
Trevor - 04/05/2018

- BLTL-20

This fits my travel trailer hitch and I can use the padlock of my choice, which is the Bolt padlock.

- BLTL-20

Good product but not usable on my hitch which is compound locking. Good only for the standard lever lock hitch.

The lock part BLTL-20 is designed for bulldog collar-lok couplers. If you have a traditional style latch lock on your coupler I recommend part # DT25013KA
Fastway Universal Trailer Coupler Lock for 1-7/8", 2" and 2-5/16" Couplers
fastway universal trailer lock. Please keep in mind, the maximum coupler width must not exceed 4-3/4 inches to use DT25013KA.
-- Etrailer Expert Heather A - 09/28/2018

- BLTL-20

I bought this for my rv trailer. I have a two inch ball. It fits a little snug but serves the purpose. It needed to be about a half inch wider to sit squarely for my trailer.

- BLTL-20

works only for very specific hitches with very very narrow flange around the ball area. make sure the dimensions work for you. Mine sit on the shelf unused

Make sure you have the Buldog hitch it will not work with wider ones with the flanges on them
Thomas - 08/26/2019

- BLTL-20

Big ol hunky piece of aluminum with a steel pin that does what it is to do, make it very difficult to steel your trailer when it is not attached to the vehicle.

- BLTL-20

Looks like good quality piece, just too small to fit my 2 5/16” tongue. The uprights that hold the pin will not fit around the tongue. I should’ve done my homework and ordered the TL 33.

The locking shroud has an inside width of 3-3/16 inches, so in order to fit your coupler would need to be narrower than that.
-- Etrailer Expert Mike L - 02/08/2019

- BLTL-20

the blaylock bulldog style receiver lock is just what I had hoped.they say it is made from hd aircraft aluminum and I have no cause to doubt that.the lock rod is hardened steel.although it has not been tested(theft attempt)it does give me peace of mind when I leave home. it seems to be a fine u s made lock and fits good,is easy to put on and remove.i'm happy with it.

- BLTL-20

Excellent product, fast shipping and built to handle! This is no cheap plastic trailer tongue lock, very heavy duty and will accept any standard lock, which I needed to interchange lock keys on occasion. Highly recommended and etrailer is the only place I could find this type of lock.

- BLTL-20

took too long to get products ok

- BLTL-20

Just what I needed. service was great. customer contact was great.

- BLTL-20

Great selection fast shipping

- BLTL-20

Morning Sorry I don’t have a picture to share but the Etrailer bull dog lock is what I purchased I have 6 of them now An WhT a great product . Always ordered online so I Neva have verbal contact wit these fellas but their service is great . Thanks for the quick shipment Timmy

- BLTL-20

The trailer lock doesn't fit my trailer.

The inside width of this coupler lock is 3-316 inches, so it will not fit couplers that are wider than that.
-- Etrailer Expert Mike L - 02/25/2019

- BLTL-20

The coupler lock is a great idea! Easy to use, and made from light weight cast aluminum. The lock pin will accept any standard sized padlock. I like that the lock pin also covers hitch latch, to prevent tampering. Pros: Light weight, small, simple, good finish, easy to use, cast aluminum wont rust or corrode. Cons: Cast aluminum, could be quickly cut through with hacksaw. Locks only keep the honest people from stealing your stuff, but its better than not having any lock.

- BLTL-20

Has worked great on our horse trailer. We have even tested it to see if anyone could beat it off. And it hasn't budged!

- BLTL-20

etrailer is very responsive and offers great products at very good prices!

- BLTL-20

Have not used the product yet but the customer service was GREAT. Spoke with Ashley and she new the answer to all my questions and helped get all my parts ordered. They arrived 3 days ahead of time too. Awesome company to work with!

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Used Items Available
Used Picture for EZ Lock Trailer Coupler Lock for 1-7/8", 2", 2-5/16" Bulldog Collar-Lok Couplers

Condition: Like New

Notes: May have damaged packaging or minor cosmetic blemishes.

Our Price: $28.95
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