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  9. 2 Inch Span
  10. 2-1/2 Inch Span
  11. 2-7/8 Inch Span
Bulldog Adjustable Coupler Lock

Bulldog Adjustable Coupler Lock

Item # BD580410
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Bulldog Universal Application Lock Trailer Coupler Locks - BD580410
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In Use/Installed


Lock secures most latch-style trailer couplers. Rubber-encased pin tumbler cylinder adjusts incrementally - from 9/16" to 2-3/4" - along notched, 1/4" diameter stainless steel shank. Lowest Prices for the best trailer coupler locks from Bulldog. Bulldog Adjustable Coupler Lock part number BD580410 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (15)
  • Q & A (10)
  • Videos (1)
  • Photos
  • Why etrailer?

Bulldog Trailer Coupler Locks - BD580410

  • Latch Lock
  • Bulldog
  • Keyed Unique
  • Universal Application Lock
  • 3/4 Inch Span
  • 1 Inch Span
  • 1-1/2 Inch Span
  • 2 Inch Span
  • 2-1/2 Inch Span
  • 2-7/8 Inch Span

Lock secures most latch-style trailer couplers. Rubber-encased pin tumbler cylinder adjusts incrementally - from 9/16" to 2-3/4" - along notched, 1/4" diameter stainless steel shank.


  • Easy access model has side key entry with sliding dust cap
  • Lock rotates 360 degrees for ease of use
  • Includes 2 keys


  • Usable span adjusts incrementally from 9/16" to 2-3/4"
  • Pin diameter: 1/4"
  • Limited lifetime warranty

580410 Bulldog Adjustable Coupler Lock

California residents: click here

Video of Bulldog Adjustable Coupler Lock

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

Video Transcript for Bulldog Adjustable Coupler Lock Review

Today we're going to be taking a look at Bulldog Adjustable Coupler Lock part number, BD580410. This coupler lock offers us six different positions when it comes to locking our coupler in place. The first one allows us about 2-7/8" worth of room. Each click is a different position, all the way down to about 3/4". It has a covered lock tumbler, prevents the dirt, rust and dust from getting in there and we've got two keys that have a nice coated finish to them. The lock itself also has a coating around it. You've got a silver side and then just a circle.

The silver side is the one you want facing your coupler lock as you put it in. Just going to slide it in and adjust it to the narrowest position. Being able to lock it in so many ways really eliminates the ability to get a large enough tool in there to do any damage and our rotating lock face is going to help to resist that prying. Once we get our coupler locked up that's really all there is to it. We can know we can either store our trailer safely or leave it hooked to the truck without it disappearing. That will complete today's look at the Bulldog Adjustable Coupler Lock, part number BD580410.

Customer Reviews

Bulldog Adjustable Coupler Lock - BD580410

Average Customer Rating:  4.7 out of 5 stars   (15 Customer Reviews)

Lock secures most latch-style trailer couplers. Rubber-encased pin tumbler cylinder adjusts incrementally - from 9/16" to 2-3/4" - along notched, 1/4" diameter stainless steel shank.

- BD580410

Good price. Good service. Thanks. 593997

- BD580410

Adjust perfectly to my latch handle. 649534

- BD580410

I've got a trailer coupler on my trailer that no other lock type will fit on. This is working fine right out of the box. Question will be how long it takes to rust. If its made right, it might not. 200305

- BD580410

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. 286706

- BD580410

I bought this thinking that this would be more of an obstacle than others because you squeeze it up to the tongue latch so that there is no way to get a hacksaw in the gap. Unfortunately the manufacturer's 6 tongue latch widths don't match mine. I'm on the last narrowist width but not quite, so I have to go to the next narrowist which leaves a decent gap for sawing it off. I push it together so that it looks flush (no gap) but it eventually wiggles open to the actual lock position. I've squeezed the latch as much as I dare for good operation and I'm so close - - but no cigar. Oh well, wished they had put more notch positions. The unused length looks easy to cut off so that you don't stick your leg with it. 496937

- BD580410

Product was complete and works great. Thank you. 256955

Working great for our application. Zero problems.
Michael H - 06/04/2017


- BD580410

Bull dog make good stuff 737570

- BD580410

Works well with the Bull heavy duty coupler. The width locking is adjustable so it pulls up tight to the over width of the Bull Coupler. 650640

- BD580410

Nice quality 470730

- BD580410

E trailer is awesome. The products are great and reasonably priced. Great customer service and fast shipping!! 373052

- BD580410

Product as described. Should be a big help in securing our travel trailer. 351622

- BD580410

Great experience here. Product was just as described and arrived in a timely manner. Very satisfied! 319866

- BD580410

great product leave it on all year around . spray it twice a year with wd-40 opens and closes every time 248448

- BD580410

Lock shaft diameter smaller than I anticipated. Item does have a sliding cover over lock face to keep moisture and debris out. Used for hitch lock on Kwik Load car trailer. 236845

- BD580410

adjustable coupler lock for Bulldog hitch tounge : prevents collar from sliding back, preventing take trailer off ball; or, putting on a ball. Simple solution. etrailer.com provided excellent service and value. 165892


Ask the Experts about this Bulldog Trailer Coupler Locks

  • Replacement Pin for Bulldog Coupler Lock and Replacement Bulldog Adjustable Coupler
    If you are looking for just the pin portion of coupler lock # BD580410 I am afraid that it is not available by itself. If you need an actual adjustable coupler then there are several Bulldog adjustable couplers available. We have the following and maybe you can identify the one you need: # BDA256C0317 (14k, 2-5/16 inch ball) # BDA200C0317 (8k, 2 inch ball) # BD028390 (7k, 2 inch ball) # BD028657 (15k, 2-5/16 inch ball) The first two have a wedge latch. The second two are the...
    view full answer...
  • Useable Length Range of the Bulldog Adjustable Coupler Lock part # BD580410
    I spoke to my contact at Bulldog and he told me that the useable length range of the Bulldog Adjustable Coupler Lock part # BD580410 is from 9/16 inches to 2-3/4 inches. So yes, this coupler lock should work well for you.
    view full answer...
  • Pin Diameter of Bulldog # BD580410 Adjustable Coupler Lock
    The Bulldog Trailer Coupler Lock, part # BD580410 has a usable span of 9/16 to 2-3/4 inches and a 1/4 inch pin diameter. If you click the provided link, you can see a product description video featuring the lock.
    view full answer...
  • Trailer Coupler Latch Lock for 2-1/2 Inch Wide Coupler Latch
    Bulldog lock # BD580410 would not be ideal for you if you need 2-1/2 inches. Instead I recommend our etrailer.com lock # e98887 that does have a 2-1/2 inch span when locked.
    view full answer...
  • Coupler Latch Lock That Allows Locking Coupler When Hitched
    To lock a cast head 2-5/16-inch coupler while it is hitched you will need a coupler latch lock like part # BD580410. This lock has a 1/4-inch diameter pin that adjusts for latch widths from 9/16-inch up to 2-3/4-inches. All coupler latch locks are shown on the linked page.
    view full answer...
  • How Long is the Bulldog Adjustable Coupler Lock 580410
    I went out to our warehouse and measured the Bulldog Adjustable Coupler Lock part # BD580410 for you. The total length of the pin end to end is right at 6" which you can see in the attached photo.
    view full answer...
  • Couple Lock Recommendation that Can be Keyed Alike
    I have a solution for you, but the Bulldog Coupler Lock part # BD580410 that you referenced can not be keyed alike. For a similar lock that can be keyed alike you would want our etrailer.com lock part # e98886. The usable span of this lock is 2 inches. For one with a 7/8 inch span you would want the # e98889. Or for 2-1/2 inches, part # e98887.
    view full answer...
  • Recommended Coupler Lock for Bulldog Cast Head Coupler
    Thanks for the photo of your coupler! It looks like it is a Bulldog Cast Head Coupler with Wedge Latch, 2-5/16 inch Ball # BDA256C0317. I spoke with my contact at Bulldog about a coupler lock for your trailer. He said that because of the shape of the # BDA256C0317 coupler, a lock that secures inside the coupler where the ball fits is not ideal. He suggested using a traditional coupler lock that secures the coupler at the latch. I really like the Bulldog Adjustable Coupler Lock #...
    view full answer...
  • 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...
  • Trailer Coupler Latch Lock for a 2-1/2 Inch Wide Latch
    Our etrailer.com coupler lock # e98887 is designed to work on a coupler width up to 2-1/2 inches. Since that is what you have on your coupler, this lock will fit and it will be a nice snug fit, which is by design. For a second option I recommend the Bulldog adjustable coupler lock # BD580410. It has a useable span of 3/4 of an inch up to 2-7/8 inches which will allow for a little more wiggle room if that is something you want. I have included links to videos on both locks for you.
    view full answer...

Do you have a question about this Trailer Coupler Lock?

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Updated by:
Laura H
Updated by:
Sarah W
Updated by:
Alexander C
Installed by:
Randy B
Video by:
Chris R

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