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

Bulldog Easy Access Coupler Lock - Swivel Head - Chrome

Item # BD580409
Our Price: $21.22
You Save: 41%
Trailer Coupler Locks
Shipping Weight: 0.71 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. Great 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 (60)
  • Q & A (0)
  • Videos (2)
  • Photos

Bulldog Trailer Coupler Locks - BD580409

  • Latch Lock
  • Keyed Unique
  • Steel
  • 3-5/8 Inch Span
  • Bulldog
  • 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 Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.6 out of 5 stars   (60 Customer Reviews)

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


Arrived quickly as ordered! Works great on my Demco 2-5/16" ball coupler.


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.


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

Ken S.




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.


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.

Ed B.


Great! Other locks bent this one has not bent pulling over fairly steep mountains.


They offer great products and amazing customer service


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.

Vernon J.


Easy to put on and earned out well with the Jack-It bike Cartier we bought at the same time. Will need to have a plate made with cutouts to fill the gap but I did manage to make a short term fix using washers as additional vertical support.


Fast delivery of high quality products. Very satisfying experience.


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!





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


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

Michael M.


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.


The tumbler fell out of the plastic housing within a month of use... made in China I’m sure. Luckily I didn’t pay much for it

Etrailer Expert

Brooke M.


The good news here is that this comes with a limited warranty. I will have our customer service team reach out to you about this.


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.


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.


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.


Exactly what I needed and at an excellent price.


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


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


had a little trouble getting the fixed brake pad into position. No instructions were included and found out that the moving portion of the caliper had to be pushed sideways for the pad to fit into the correct groove. Other than that, things went as expected and you can't beat the service or the price.


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.


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.


Works as advertised


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


The receiver lock fits perfectly and is EXACTLY what I needed. Once again etrailer exceeded my expectations!


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

Show More Reviews

See what our Experts say about this Bulldog Trailer Coupler Locks

  • Coupler Latch Lock for a Coupler Latch that is 2-3/4 inches Wide
    I went out to the warehouse and pulled Bulldog coupler lock # BD580409. When locked the pin span is 3-5/8 inches. That is probably more pin exposed than you want. Coupler lock # BD580410 has a usable span of 9/16 to 2-3/4 inches so it would be a better option for you. We also have several Bolt brand keys that you could key to match your vehicle key and that have a span range that would work for you. I have included a link to them to the right.
    view full answer...
  • Span of Pin on Bulldog Trailer Coupler Latch Lock # BD580409
    When Bulldog coupler lock # BD580409 is locked the span of the pin is 3-5/8 inches. For a 2-1/2 inch span I recommend our lock # e98887.
    view full answer...
  • What Size Locking Pin Do I Need for the Curt Coupler Repair Kit # C25094?
    For the Curt Coupler Repair Kit for 1-7/8" Curt Channel Couplers # C25094, you need a pin no larger than 3/8". For this measurement, I recommend the Bulldog Easy Access Coupler Lock - Swivel Head - Chrome # BD580409. I attached a picture with the measurement of the pin hole.
    view full answer...
    Image 1 for
  • A-Frame Coupler Lock for Wide Latch
    There is a solution for you, though the Master Lock Hitch Receiver and Coupler Latch Lock Set # 1481DAT will fit coupler latches that are 2". Instead, I recommend the Bulldog Easy Access Coupler Lock # BD580409 which has a 1/4" pin diameter and spans 3-5/8". I've added links to video reviews of this coupler lock for you to take a look at.
    view full answer...
  • Pin Diameter of 3-5/8 Inch Long Trailer Coupler Locks
    The 3-5/8 inch long trailer coupler locks do only have pin diameters of 1/4 inch; there isn't a coupler lock available with a pin that has a slightly larger diameter, as the 1/4 inch is indeed standard. The locks that are 3-5/8 inches long are as follows: - Bulldog Easy Access Coupler Lock # BD580409 - MaxxTow Coupler Latch Lock # MT76FR I have added some links below to video reviews for you to check out as well if you'd like to take a look.
    view full answer...
  • Recommended Lock For Bulldog Collar-lok Coupler With Trailer Hooked to Vehicle
    If you have a bulldog collar-lok coupler with a hole with pin like part # BD028387, you can use Bulldog Easy Access Coupler Lock part # BD580409. The Bulldog Coupler lock allows you to keep the trailer hooked up to the vehicle while locked. This will also work on a Bulldog A-frame coupler like part # BD44150W0317.
    view full answer...
  • Trailer Coupler Lock Compatible with Wide Coupler
    If you have a Bulldog Collar-Lok Coupler, then the EZ Lock Trailer Coupler Lock for 1-7/8", 2", 2-5/16" Bulldog Collar-Lok Couplers # BLTL-20-40D is your best option. If you want the pin style coupler lock, then the Bulldog Easy Access Coupler Lock - Swivel Head - Chrome # BD580409 is the largest span option at 3-5/8 inches.
    view full answer...
    Image 1 for
  • Ordering Coupler and Hitch Pin Locks All Keyed Alike
    If you selected keyed alike on the etrailer coupler and pin lock set part # e99039 which is a pin and coupler lock and also selected keyed alike on the part # e98884 which is a pin lock you'd be able to order as many of either and they'd all use the same key.
    view full answer...
  • Hitch Lock Solution for Rola Bike Racks
    While I have a solution for you the Bulldog lock you referenced # BD580409 is designed to be installed on a trailer coupler and not for use on a bike rack as the pin diameter is way to small. Instead you'd want a coupler lock like the # e98879 for if you are installing the Rola bike rack in a 1-1/4 inch hitch or if you are using a Rola rack with a 2 inch shank diameter you'd need to use the cable lock part # e98891 which you'd route through the bike frame and then to the safety loops of...
    view full answer...
  • Recommended Coupler Lock For Demco Trailer Coupler DM14976-52
    To be able to lock the latch on the Demco Trailer Coupler - Adjustable Channel Mount # DM14976-52 you were looking at I recommend the Bulldog Easy Access Coupler Lock # BD580409.
    view full answer...
  • Bulldog Collar-Lok Coupler w/ High-Profile Latch # BD028463 Accessories and Replacement Parts
    For the Bulldog Collar-Lok Coupler w/ High-Profile Latch # BD028463 we have the Latch Repair Kit # BD024200 that is specific to the coupler. For a Jack there are several options based on how much weight you are needing to lift and also if you are wanting manual or electric. I recommend the Lippert Smart Jack Electric Trailer Jack # LC643589 if you are wanting an electric jack. This jack is rated for a lift capacity of 3,500lbs and has programable memory, so that you will be able to set...
    view full answer...
  • Coupler Lock to Use with Demco A-Frame Coupler # 12660-97SP
    For the Demco A-Frame Coupler # 12660-97SP that you referenced the etrailer locking hitch pin part # e98888 would fit and work great. This has a usable span of 3-3/8 inches.
    view full answer...
  • Lock For Demco EZ Latch Coupler on Airstream Basecamp 20X Travel Trailer
    It sounds like your Airstream travel trailer uses a Demco EZ Latch coupler such as part # DM14793-95. You'll need a lock with a minimum inside span of 3 inches. I'd recommend the etrailer brand # e98888 which has a 3-3/8 inch inside span.
    view full answer...
  • Coupler Lock With 3-5/8" Span For a Surge Brake Trailer Coupler
    Currently the Bulldog Easy Access Coupler Lock # BD580409 is our only coupler lock that has at least the 3-5/8" span you are needing for your surge coupler. They do not offer this with a matching 2-1/2" hitch receiver lock. I recommend getting the Fastway Trailer Hitch Receiver Lock # FA86-00-3160 with the Bulldog lock above as they both use different style keys so you will not confuse the 2 different locks. It fits a 2"-3" hitch receiver.
    view full answer...

Do you have a question about this Trailer Coupler Lock?

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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