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Replacement Coupler Cap Spring for Bulldog Round Tongue Collar-Lok Couplers

Replacement Coupler Cap Spring for Bulldog Round Tongue Collar-Lok Couplers

Item # BD500354
Our Price: $10.45
Accessories and Parts
Shipping Weight: 0.01 lbs
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Replaces the cap spring for your Bulldog round tongue Collar-Lok couplers (BD028442, BD028381, BD028242, or BD028461). 1-800-940-8924 to order Bulldog accessories and parts part number BD500354 or order online at Free expert support on all Bulldog products. Great prices and Fastest Shipping for Replacement Coupler Cap Spring for Bulldog Round Tongue Collar-Lok Couplers. Accessories and Parts reviews from real customers.
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  • Reviews (127)
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  • Videos (2)
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Bulldog Accessories and Parts - BD500354

  • A-Frame Trailer Coupler
  • Springs
  • Bulldog

Replaces the cap spring for your Bulldog round tongue Collar-Lok couplers (BD028442, BD028381, BD028242, or BD028461).


  • Replaces the cap spring for your Bulldog round tongue Collar-Lok coupler (BD028442, BD028381, BD028242, or BD028461)


  • Overall length: 1-7/8"
  • Quantity: 1 replacement cap spring


  • Bulldog round tongue Collar-Lok couplers: BD028442, BD028381, BD028242, and BD028461

500354 Replacement Coupler Cap Spring for Bulldog Round Tongue Collar Lock Couplers

California residents: click here

Video of Replacement Coupler Cap Spring for Bulldog Round Tongue Collar-Lok Couplers

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

Video Transcript for Review of Bulldog Trailer Coupler Latch Spring - BD500354

Michael: Hi, there. I'm Michael with Today we're going to take a quick look at this replacement coupler cap spring. This is going to replace the cap spring on your Bulldog collar lock coupler with low profile latch. It can also replace the spring in your Bulldog high-profile latch repair kit for heavy duty collar lock couplers. Either way, it's going to work basically the same way.

It's going to make sure that your coupler can spring back open. The spring right here on this coupler, you can see how it's allowing that coupler to spring open to disengage from the ball.If you are needing a replacement spring for your coupler, this is going to be the direct replacement from Bulldog, so you can trust it's going to work. You're not going to have to worry about any compatibility issues or anything like that. Just like your original, this is just shy of two inches in total links, but it's real close to that two inch mark, you can see there. I would call it probably 1 15/16 in total length.

But like I said, this is a Bulldog product, so if you are needing a new spring for your coupler, this is going to be the part for you. That's going to complete our look for today. Again, I'm Michael with Thanks for watching.

Customer Satisfaction Score:

Customer Reviews

Replacement Coupler Cap Spring for Bulldog Round Tongue Collar-Lok Couplers - BD500354

Average Customer Rating:  4.9 out of 5 stars   (127 Customer Reviews)

Replaces the cap spring for your Bulldog round tongue Collar-Lok couplers (BD028442, BD028381, BD028242, or BD028461).


Excellent communication after sale with shipping information. etrailer even contacted me after part was delivered to make sure everything went well and wanted to know if I was satisfied with my purchase. I couldn’t ask for better service. I will obviously use them again for my trailer needs.



Excellent product quality. Still working after a year.A+

Etrailer Expert

Mike L.


@Chris Thanks!


We replace these yearly to keep the release working freely. I have 10 of the Bulldog Round Collar-Lock Couplers on trailers that are towed every day and will continue to use them. I don't have to worry about them coming loose.


My old spring was weak, & was not opening the hitch anymore. Ordered this one & replaced it on the hitch. Works great now, just like brand new.


Worked fine for my trailer hitch


Fits like charm.


It fitted like it should and has been trouble free since.


Part fit perfectly. Fast and reasonable shipping.



Works like it should. No issues at all.


Glade E-Trailer stocks these springs. Shipping was fast and received the right product. Using 8 of the Bulldog ball hitches and really like them. Just have to replace spring sometimes.


The hinged jaw on my collared coupler was not springing open as it should after a year outside, so I figured the spring was rusted and/or worn. I called the trailer/hardware store where I purchased my trailer and they told me I had to buy their $40 coupler repair kit. Luckily for me, etrailer had the spring for under $3. My coupler works like new!



still happy with the replacement part


Exact OEM replacement for my Bulldog trailer hitch. Easily "popped" into place and my coupler was repaired. Quick shipping reduced down time.



The spring works well, it has popped out once or twice, but I found it and put it right back in.


I usually store my Anderson hitch drawbar in the coupler. I had a Bulldog installed on my Airstream (well worth the $500 it cost). I use this lock when among friends to prevent them from dropping the Anderson on a foot if they are curious about the Bulldog. This lock would not deter a thief.


This is great to find and have for the next time I drop one in tall grass!


I ordered this spring on June 29th and received it on July 3rd. The spring appears to have some protective coating and fit perfectly.


The spring was easy to install, and works great


I know this is a small part, but it makes a big difference when your trailer has it missing. My hitch now pops open as it should when I slide the collar back, and I no longer have to keep track of a screwdriver or pry bar to pop my hitch open. It has greatly simplified the process of dropping my trailer.


Stow and tow 7 inch drop/7.5 inch rise hitch arrived last night. It is an excellent piece of gear and is very stout. I hooked it up to our 27' Charmac and it worked very well.

It is very easy to adjust the desired height. I wish that I'd gotten one years ago.

The spring I needed for a Bulldog Collar lock hitch came in the same shipment and was a cinch to install and it works like it did when it was new. It pops right open when the collar is moved back.

I have been extremely please with the customer service and attention to detail fro and will continue to use them.

They also honored their low price guarantee when I recently purchased a gooseneck hitch.

Darrell T.


work great past shipping Thanks


I damaged the spring moving the trailer with a tractor.
I didn't even think i could get one but etrailer had it.
fast shipping and great service on everything i have purchased from etrailer.
I live very far from any city and can get parts faster from etrailer than actually driving to the city and finding out no dealer has in stock what i need.
Thank You etrailer


Just what I needed


The hitch repair kit fit perfectly. The spring is another issue.The coupler jaw opened up to far to hold the spring. I used JB Weld to hold the spring in place. I also reduced the opening a small amount with some epoxy. I assume the stop wears over time.
I was pleased with the parts I ordered. The package arrfived a day earlier that USPS said it would arrive.I will ALWAYS go to ETrailer first!


Fit perfectly into my coupler blind holes and exerts the right amount of pressure.


Wasn’t as shiny as on the webpage and had a little rust showing on it in the bag but I know it will get very rusty once put on the trailer hitch. Thought the shipping cost was pretty high ($4.99) for and $8 spring that came in a small envelope.


A local trailer retailer and repair business wanted to replace the collar rather than try to replace this spring. I ordered this spring and replaced it myself and saved at least $150. It is still working great!! Thanks to etrailer!


Perfect fit for an older hitch. Very strong spring. Works perfectly. Package was lost during shipping and they sent another out quickly. Great customer service. Would definitely recommend this to anyone and will be shopping with them in the future.


These worked great giving me the clearance I needed for my 5th wheel trailer.

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Info for this part was:

Employee Laura H
Written by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Zach D
Video Edited:
Zach D
Employee Michael B
Installed by:
Michael B

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