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  1. Trailer Coupler Locks
  2. Bulldog
  3. Steel
  4. Latch Lock
  5. Keyed Unique
  6. 3-5/8 Inch Span
Bulldog Easy Access Coupler Lock - Swivel Head - Chrome

Bulldog Easy Access Coupler Lock - Swivel Head - Chrome

Item # BD580409
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Trailer Coupler Locks
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Shipping Weight: 0.68 lbs
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BD580409 - Keyed Unique Bulldog Latch Lock
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Protect your trailer from theft with this swivel-head coupler lock. Chrome-plated steel resists rust. Lowest Prices for the best trailer coupler locks from Bulldog. Bulldog Easy Access Coupler Lock - Swivel Head - Chrome part number BD580409 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (51)
  • Q & A (0)
  • Videos (2)
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Bulldog Trailer Coupler Locks - BD580409

  • Steel
  • Latch Lock
  • Bulldog
  • Keyed Unique
  • 3-5/8 Inch Span
  • Universal Application Lock

Protect your trailer from theft with this swivel-head coupler lock. Chrome-plated steel resists rust.


  • Coupler lock secures your trailer's coupler to deter theft
    • Trailer can't be removed from your tow vehicle when locked
    • Would-be thieves can't secure your unhitched trailer to their tow vehicle
  • Lock housing rotates 360 degrees for easy access
  • Chrome plating resists rust
  • Sliding plastic cap covers key slot to help prevent corrosion in the locking mechanism
  • Includes 2 keys


  • Pin diameter: 1/4"
  • Span: 3-5/8"
  • Limited lifetime warranty

580409 Bulldog Easy Access Long Coupler Swivel Lock

California residents: click here

Video of Bulldog Easy Access Coupler Lock - Swivel Head - Chrome

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

Video Transcript for Bulldog Easy Access Trailer Coupler Lock Review

Today we're going to be talking a look at the Bulldog easy access rotating or swivel head trailer coupler lock. Part number on it is BD580409. The lock comes with two keys. Has a plastic housing around it to protect the lock as well as a sliding dust cover to prevent anything from getting into that tumbler and causing corrosion. Got a step pin, going to slide in. Locks very easily.

The lock also rotates 360 degrees to give us access to that tumbler at any angle. It's got a chrome-plated steel. It's going to help to resist corrosion. It couldn't be easier to use. Take it, indentions here in the end, easy to hold onto.

Slide it through and push it closed. That's going to prevent anyone from hooking up to your trailer and being able to secure it to their vehicle or also anybody removing it from your vehicle and talking it. They do offer a limited lifetime warranty on the lock so you can be sure that they're going to stand behind their product. That will complete today's look at the Bulldog easy access coupler lock with the swivel head, part number BD580409. .

Customer Reviews

Bulldog Easy Access Coupler Lock - Swivel Head - Chrome - BD580409

Average Customer Rating:  4.6 out of 5 stars   (51 Customer Reviews)

Protect your trailer from theft with this swivel-head coupler lock. Chrome-plated steel resists rust.


Fits good on my trailer. I should of brought a lock with the shaft a little smaller. ( that is my fault !) the lock is well designed and will keep your part crooks at bay. Your serious crooks will use a large bolt cutter and cut it. This is true with any lock. I do feel better having my trailer locked up now with this lock.


Bull Dog brand so you can't go wrong - a step above just a pin - BD580410 might be better adjustment wise against my Bull Dog coupler. Also use a coupler lock like Master ML389DAT.


The Bulldog coupler lock looks to be of fine quality. I will still need to have some holes drilled in my trailer tongue in order to use it as intended, but it should secure everything nicely. Courtney B is exactly who anyone would want to take care of them. She seems knowledgeable and responds instantly. All in all, etrailer has given me the best online buying experience ever, twice!

Lloyd - 08/21/2021


works like it should, i had to buy the longer version to have enough space to get the lock to work. I keep it on the trailer when parked for a little extra theft protection


Exactly what I needed to secure my boat trailer on the hitch. My trailer has surge brakes and the wider hitch design made it too long for local available lock systems to engage. The Bulldog lock offered the length needed, plus the excellent description and videos offered by etrailer made my choosing the right product for me a snap, along with the great pricing, and prompt processing service makes etrailer my first stop for all my trailer needs in the future.

Great! Other locks bent this one has not bent pulling over fairly steep mountains.
Ed B - 08/31/2020


Secures trailer at a reasonable price. Works as described and easy to operate.


I have had the Bulldog trailer coupler lock for a year. Still locks and unlocks smoothly. It hasn't rusted at all. Great product.

I have owned the Bulldog trailer coupler lock for over two years. It doesnt have one spot of rust on it. It still turns easily. Great product.
Michael C - 08/05/2019


Excellent lock for my application!


Easy search process. Good product and simple delivery. Could t ask for more than that.


Just what I wanted. Does the trick I was looking for. Great products.


Appears to be well built. The issue I have with the tongue lock is the lock mechanisim doesn't slide past the end of the pin. My last lock slid down the pin to make a tight fit and would be difficult to cut. This particular lock would be easy to take a bolt cutter to. As a pin to keep the latch in place it's OK but as a theft deterrent not so much. If theft deterring is your goal, I would look on past this item for something more effective.


Just got it, but so far I like it.


After 1 season, the lock froze up and would not allow you to turn the key. After numerous attempts with lock luberencent, we ended up cutting the lock off.


Not the strongest lock but something to at least slow down a casual opportunity for theft at the weakest link in the chain of security.


Just as advertised and quick delivery thank you


This was the only type lock that would work on my trailer. I received it quickly and it works perfectly. I especially like the fact that the key receiver is protected from the elements which should ultimately extend the life of the lock .

The lock is still working flawlessly
Brian - 09/05/2020


Ordered multiple parts everything fit together perfectly.
Overall from ordering to shipping was a great experience.
Thanks etrailer


Excellent product. Using it as a trailer coupler lock. Bought a Pro Series Cargo Carrier from last year. An excellent product as well from a great company. Thank you.


Purchased this lock to secure a new Dexter low-profile coupler - despite how the lock is shown on etrailer, I sense the Dexter coupler is what it was primarily designed to address. Fits perfectly in a very unique circumstance. I wish I had snapped an image... anyway, as is always the case, etrailer had my solution. Thank you.


Best way to protect your hitch from theft and much easier to use than other hitch locks.


Just what I needed for the security of my trailer with the fastest of shipping! Thank you!


Perfect fit for my new hitch. Good product. Works well.


Works great at a very reasonable price.

Its great we love it and would recommend it to anyone who asks
Larry - 09/06/2018


Put that lock on my boat trailer and it finally quit moving everytime I was out of town!
Thanks Etrailer Love it!


Due to a recent rash of trailer thefts in my area I was looking for a way to lock my trailer latch, and this lock works great.

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Laura H
Written by:
Laura H
Employee Cole B
Installed by:
Cole B
Employee Randy B
Installed by:
Randy B
Employee Chris R
Video by:
Chris R
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

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