1. Trailer Coupler Locks
  2. Bulldog
  3. Latch Lock
  4. Keyed Unique
  5. Universal Application Lock
  6. 3/4 Inch Span
Bulldog Lifelong Trailer Coupler Lock - Trigger Latch Style - 1/4" Pin Diameter - Chrome

Bulldog Lifelong Trailer Coupler Lock - Trigger Latch Style - 1/4" Pin Diameter - Chrome

Item # BD580403
lowest price pledge
Retail:$39.27
Our Price: $33.76
You Save: 14%
Trailer Coupler Locks
Orders above $99 qualify for Free Shipping
Shipping Weight: 0.68 lbs
Quantity: 
In Stock
BD580403 - 3/4 Inch Span Bulldog Trailer Coupler Locks
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Guard against trailer theft with this durable steel, butterfly-style coupler lock. Works with most ball couplers that have trigger-style latches. Chrome plating resists corrosion, and the unique ball-bearing locking mechanism provides extra security. Lowest Prices for the best trailer coupler locks from Bulldog. Bulldog Lifelong Trailer Coupler Lock - Trigger Latch Style - 1/4" Pin Diameter - Chrome part number BD580403 can be ordered online at etrailer.com or call 800-298-1624 for expert service.
  • All Info
  • Reviews (357)
  • Q & A (18)
  • Photos
  • Why etrailer?

Bulldog Trailer Coupler Locks - BD580403

  • Latch Lock
  • Keyed Unique
  • Bulldog
  • Universal Application Lock
  • 3/4 Inch Span
  • Steel

Guard against trailer theft with this durable steel, butterfly-style coupler lock. Works with most ball couplers that have trigger-style latches. Chrome plating resists corrosion, and the unique ball-bearing locking mechanism provides extra security.


Features:

  • Coupler lock secures the trigger latch on your trailer's coupler to deter theft
    • Trailer can't be removed from your tow vehicle when locked onto ball
    • Would-be thieves can't secure your unhitched trailer to their tow vehicle
  • Ball-bearing locking system provides maximum security and ease of use
    • Just pop the deadbolt portion onto the end of the pin and the lock will automatically engage
    • Grease ball-bearings periodically to ensure smooth operation
  • Solid steel construction offers superior strength and durability
  • Chrome plating resists rust
  • Plastic cap covers key slot to help prevent corrosion in the locking mechanism
  • 2 High-security, square keys included


Specs:

  • Application: trigger-latch-style ball couplers
  • Inside pin length (span): approximately 3/4"
  • Pin diameter: 1/4"
  • Limited 1-year warranty


The unique ball-bearing locking system on this Lifelong coupler lock is supremely easy to use. When you pop the deadbolt portion of the lock onto the end of the pin, the integrated ball bearings engage the lock automatically.



580403 Bulldog Life Long Coupler Lock for Trigger-Style Couplers




California residents: click here



Customer Reviews

Bulldog Lifelong Trailer Coupler Lock - Trigger Latch Style - 1/4" Pin Diameter - Chrome - BD580403

Average Customer Rating:  4.7 out of 5 stars   (357 Customer Reviews)

Guard against trailer theft with this durable steel, butterfly-style coupler lock. Works with most ball couplers that have trigger-style latches. Chrome plating resists corrosion, and the unique ball-bearing locking mechanism provides extra security.

- BD580403
by:

It is very easy on and off. fits well and the rubber cap cover for the key slot is a nice idea. Because it's so compact and fits tightly on the hitch it would be harder for a thief to cut off. It's worth having for the extra feeling of security.



- BD580403
by:

Simple design, dont be fooled, it does the job well, secured trailer in the parking lot with decent lighting. Been on several outfits state travels and I am thankful that the reviews were positive, making my choice to purchase this easier. No issues of it being in open weather with its cover,opens every time. No rust to be found. In all, it provides a level of security for my trailer or at least make it real hard to steal.



- BD580403
by:

I purchased this item to use with a 7'x16' trailer which carried my family's household belongings across the country last year. The trailer had a 2-5/16" ball. The reason I mention these dimensions is that this lock didn't fit on my trailer. The shaft was too short for my trailer. I ended up not using a lock and just unhitched and secured the trailer with a coupler lock every night during the trip. I gave this item to a friend who owns a smaller trailer. He loves it. I watch the Lock Picking Lawyer online, and I see patterns as I watch those videos. I purchased this lock because of the following: 1. The locking shaft is hidden when locked making physical attack more difficult. 2. Hardened steel body construction 3. Disc detainer core which requires special tools and skills to pick. TLDR; If it fits, I believe you'll be pleased. If you have a larger trailer, it may not fit.



- BD580403
by:

one star off for heavy plastic zip ties that required saw to cut thru... why make these things so thick you could cut your hand off getting out of the packaging.? Lock fantastically built and engineered. Heavy and very strong. Good job...ditch the zip ties



- BD580403
by:

Lock shackle too short to use on my trailer. I'll try to find use for it somewhere.


Comments
Thank you for your review. The pin span is approximately three quarters of an inch. If the latch is thicker than that you will need a longer pin like part e98886.
-- Etrailer Expert Heather A - 03/19/2021


- BD580403
by:

The lock is currently being used to secure a metal gate with very tight clearance where most locks do not clear. The attached photo shows the lock installed.



- BD580403
by:

Exactly what I was looking for - it’s stout, simple to use, and fits perfect with no room for a hacksaw to get to it



- BD580403
by:

I got two of these since I needed locks on two trailers. They function differently than similar locks I have used in the past. The lock is a plunger type that uses the key to press in and lock it shut. Both of the locks required a lot of wiggling and turning to get to lock. They appear to have crude tolerances and a lot of play, requiring exact lining up to close. I put a little lube in the lock and ball mechanism and it helped. I was not able to pull them apart by hand once locked. They do unlock easily with the key. I know they aren't the best quality by the price I paid and they are made in China. I am tempted to pry or hammer on one a bit to see if it opens. If it does, I will just chalk it up to knowing better than buying cheap and replace both with higher quality locks. If it holds up, I will say I got my money's worth. E-Trailer does have excellent communication regarding sales and shipment. I have bought from them in the past and will in the future, no matter what the final verdict is on these particular locks.



- BD580403
by:

This lock works and performs just like the receiver lock. The ball bearings will need a slight coating of grease to keep things moving over the long haul. I only wish this was made in Stainless Steel to match the other lock. Having just received this, I will update in the future if any problems appear. Extremely happy with speed of delivery and availability of these locks.



- BD580403
by:

These locks performed horribly, the three I purchased had all become impossible to unlock and remove from the trailer coupler. I had to cut them off with a grinder/cut-off wheel. That being said, I was delayed hooking up my trailer 45 minutes by the time I got the lock removed. The stainless steel ones I had prior held up great. These were a waste of money.



- BD580403
by:

I own several of these. These coupler locks are good because they require the key to unlock but you can then lock them without the key by pressing the button. They are fairly weather resistant, although the metal pin that goes into the coupler is mild steel and will rust quickly. If that pin were stainless the lock would be improved.



- BD580403
by:

Purchased two trailer coupler locks for a new travel trailer. The locks arrived in 5 days and were exactly as described. This is my first purchase with 'etrailer.com'. I am sure there will be more purchases in the future. Nice site and easy to navigate.



- BD580403
by:

quick shipping and good packaging. Lock comes with weatherproof cover for the keyhole which is nice



- BD580403
by:

These coupler locks fits great because they are so close and tight the coupler it would be very difficult and very time consuming to cut. Good heavy material and great locking system.



- BD580403
by:

Very good looking product and good quality. A must have.



- BD580403
by:

I ordered 3 of these and they seem to be great quality. One of the reviewers stated his lock was real finicky. I had the same issue with one of the three I ordered and George from etrailer quickly exchanged it free of charge. Very happy customer



- BD580403
by:

It fit. A reviewer of another product recommended this product, after trying another brand that did close enough to lock. I've been a customer of etrailer for a couple of years. This sale was perfect, and was delivered several days prior to estimate. Etrailer.com .......... always a great choice.



- BD580403
by:

Works great and easy to install and use



- BD580403
by:

There's nothing wrong with this lock as I bought it as an option to another lock for my trailer coupler. I can't use this one due to the short "span" of the pin but I will be able to use it somewhere.



- BD580403
by:

Would recommend this product, works great and holds up to the Wisconsin winter


Comments
Very well
Jerry - 08/17/2017



- BD580403
by:

Fits on my trailer and works to lock in place.



- BD580403
by:

Order was delivered four days ahead of schedule and was just what they advertised. Sales person was knowledgable of thre weight distribution system and helped me order the correct down shank my truck and trailer required. As usual a good experience.



- BD580403
by:

Best trailer lock ever. Easy on, easy off, unique key. Excellent product. Well worth the price.



- BD580403
by:

Had no problems with the lock as long as I lubricate it twice a year (salut and winter weather). Would have like it in stainless for longivity!



- BD580403
by:

This lock has served it's purpose well. No rust or other external blemishes. It can be difficult to lock sometimes (which is usually just user error).


25
360
Show More Reviews

Ask the Experts about this Bulldog Trailer Coupler Locks

  • Recommended Pin Lock for Trailer Coupler
    The Bulldog Lifelong Trailer Coupler Lock part # BD580403 is an excellent option to secure a trailer. It will prevent the trailer from being coupled as well as preventing the trailer from being uncoupled. The ball-bearing design really makes for a smooth action and operation. Atwood is no longer in business.
    view full answer...
  • Stainless Steel Coupler Lock Availability
    There are other manufacturers who make stainless steel coupler locks, but Bulldog is not one of them. I attached a page that has all of the stainless steel coupler locks we offer. None of them are the exact same style as the part # BD580403 that you referenced, but there are some similar ones that could work.
    view full answer...
  • Trailer Coupler Latch Lock with a 1/4 Inch Diameter Pin Longer than 3/4 Inches
    We have several latch locks that have longer pins you could use. Master Lock Adjustable Trailer Coupler Lock - Stainless Steel Item # 2847DAT has an adjustable span of 9/16" to 2-3/4". Stainless Steel Trailer Coupler Lock # e98890 has a span of 7/8" as does lock # 2878DAT. I have linked videos of these locks for you.
    view full answer...
  • Recommended Trailer Coupler Locks Keyed Alike
    If you are looking for keyed alike coupler locks, I recommend the Fastway Universal Trailer Coupler Lock # DT25013KA. This will keep anyone from connecting to your trailer and taking it away. I've attached a video to help with this design and function. If you are looking for a trigger lock, then I recommend the Bulldog # BD580403. There isn't a keyed alike option for these locks.
    view full answer...
  • Trailer Coupler Latch Lock with 1 Inch Pin Span
    Master Lock has an adjustable latch lock, # 2847DAT that has presets for either a 1 inch span or a 2 inch span. We also have some that are 7/8 inch spans which is 1/8 of an inch more than a 3/4. We have # e98890, # 2878DAT, and # e98889. I have linked some video reviews of these locks for you.
    view full answer...
  • Coupler Lock for Titan # T43329007K Brake Actuating Trailer Coupler
    The Bulldog coupler lock you referred to, part # BD580403 would not fit the Titan Brake Actuating Coupler you mentioned. The lock simply is not compatible with that style of coupler. A better choice would be a Universal Coupler Lock like the Fastway # DT25013KA. I have linked you to a product demonstration video showing how the lock works. To view the video, simply click the link.
    view full answer...
  • Replacement Keys for Bulldog Lifelong Trailer Coupler Latch Lock
    Unfortunately, the Bulldog Life Locks like part # BD580403 are uniquely keyed and replacement keys aren't available. Your best bet would be to cut the lock off and replace it. The etrailer brand locks are available keyed alike if you wish, so you could get a locking hitch pin like # e98882 and a latch lock like # e98890 that are keyed alike. If you write down the key number, and put it in a safe place (but not so safe that you can't find it later), we can get replacement keys for you if...
    view full answer...
  • Anti-Theft Lock Recommendations for Yakima EasyRider Double Decker Trailer # Y08129
    I can definitely help come up with a way to make the Yakima EasyRider Double Decker Trailer # Y08129 as theft resistant as possible but I can't safely recommend you replace the hardware that secures the coupler or hinge to the trailer tongue with hitch locks of any kind. You have to use the included hardware otherwise the warranty of the trailer would be voided and you'd be potentially unsafe to yourself and other motorists. So for the latch of the coupler you could use a trigger latch...
    view full answer...
  • Comparing the Stainless Steel Trailer Coupler Lock e98890 and Trailer Coupler Lock e98889
    The Stainless Steel Trailer Coupler Lock part # e98890 is made of stainless steel, not chrome plated which is why it is more expensive than the Trailer Coupler Lock part # e98889 which is chrome plated steel. The stainless steel option is better as you don't run the risk of the chrome plating chipping and exposing unprotected steel. In regards to the Bulldog Lifelong Trailer Coupler Lock part # BD580403, this will work with pretty much any trigger style latch with a 1/4" diameter pin...
    view full answer...
  • Recommendation for Most Secure Trailer Coupler Lock
    The more secure coupler locks we offer are designed for be used when the trailer isn't hitched to the vehicle. They're designed to prevent the coupler from being hitched to a trailer ball, like # FA86-0015-305. With the trailer attached to the ball, you'd want to use something that would prevent the latch mechanism of the coupler from being opened, as well as securing the ball mount into the hitch receiver using something like the # BD580402 hitch lock you'd looked at. The latch...
    view full answer...
  • Recommended Trailer Coupler Locks That Can Be Keyed Alike
    I have another option for you, but there is not a way to get 5 of the Bulldog Lifelong Trailer Coupler Lock # BD580403 keyed alike. Instead I recommend the etrailer Trailer Coupler Latch Lock in Stainless Steel # e98890 or Chrome # e98889 which can be keyed alike. All you will need to do is select the keyed alike option from the drop down menu, and change the quantity to 5 before adding them to your cart. I included a video of the etrailer # e98890 and # e98889 for you to take a look at.
    view full answer...
  • Recommended Hitch Lock and Coupler Lock Incorporating Safety Chains
    I am not aware of any chain lock. We do have some ball mounts like the B&W Tow & Stow 3-Ball Mount - 2" Hitch - 5" Drop, 5-1/2" Rise - 10K - Black # BWTS10048B which when using a locking hitch pin like # 63232 will secure the shank and ball to the hitch receiver. The Curt Channel Style # C45900 will also secure the ball and mount using # C23556. If you want to secure a coupler to the ball you can use # BD580403. If you really want to secure your chains, you can use a cable lock...
    view full answer...
  • Trigger Latch Lock Recommendation for Demco Coupler with Trigger Latch
    We have a really great solution for a lock for the latch of the Demco Coupler part # DM12925 that you referenced with the Bulldog Lifelong Trailer Coupler Lock # BD580403 that fits tight to the coupler trigger making it very hard to get into. The span on this is 3/4 inch which is the same width as the Demco trigger. I attached a picture of the lock installed as well as a review video for you to check out as well.
    view full answer...
    Image 1 for
  • 2-1/2 Inch Span Bulldog Lifelong Hitch Lock Recommendation
    For a longer version of the hitch lock that comes with the part # BD580404 you would want the part # BD580402 as it has a 2-1/2 inch span. For the matching trigger latch lock as well you would want the part # BD580403.
    view full answer...
  • Recommended Trailer Coupler Locks for Open Car Hauler
    We have numerous hitch and coupler locks available. I'm assuming you're looking for a coupler lock that would prevent somebody from hitching your trailer up and taking off with it, is that correct? If your trailer uses a simple latch style coupler like part # BD580403. The locking pin would insert through the hole in the coupler latch, and would prevent the coupler from being opened. If the coupler has a flange around it's lower edge, something like our # e98893 would work well on...
    view full answer...
  • Lock Recommendation for Fitting Pin on Trigger Latch Coupler
    Sounds like you are looking for a lock for the trigger latch of your coupler. For that we have the Bulldog Lifelong Coupler Lock part # BD580403 designed for this which has a pin diameter of 1/4 inch.
    view full answer...
  • Recommended Trailer Hitch Lock and Trailer Coupler Lock
    For your 2020 Chevy Silverado 3500 with 2-1/2 inch trailer hitch receiver I recommend the etrailer Hitch Receiver Lock for 2" and 2-1/2" Hitches - Flush - 3-5/8" Span - Chrome # e98881 and then the Bulldog Lifelong Trailer Coupler Lock - Trigger Latch Style - 1/4" Pin Diameter - Chrome # BD580403. These are great locks that will help deter theft. Unfortunately we do not currently have any keyed alike options compatible with 2-1/2 inch trailer hitch receivers. I recommend keeping...
    view full answer...
  • Can Pintle of B&W Tow and Stow # BWTS10056 Be Moved Down to Lock Coupler Onto Trailer Ball
    Due to the thickness of the top of the coupler, you wouldn't be able to lower the pintle all the way when used on a regular coupler. You'd be better off using a coupler lock to prevent the coupler from being unhooked. The best lock for you will depend on the design of your coupler. If you have a latch style, a lock like the Bulldog # BD580403 would be an excellent choice, and could be used while towing. To view a product demonstration video of the ball I recommended, click the provided link.
    view full answer...

Do you have a question about this Trailer Coupler Lock?




  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality trailer coupler locks for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate trailer coupler lock information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

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 Adam R
Expert Research:
Adam R
Employee Lindsey S
Written by:
Lindsey S
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.