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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: $9.33
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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). 1-636-306-4830 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 (108)
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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 Bulldog High-Profile Latch Repair Kit Installation

Today we'll be having a look at the Bulldog high-profile latch repair kit for heavy duty cowl lock couplers, part number BD054200. This kit also features a replacement cap spring, that if you only need that, it can be purchased separately as part number BD500354. This kit works on couplers such as part number BD028386, which used a 2" ball. We have our new latch here, a new clip, a new keeper clip, a new bushing, with 2 keeper washers, and our new spring. The reason we want this replacement latch kit is in case if it ever becomes damaged, we can easily replace it without having to weld on a whole new coupler to our trailer. We have a couple tools here today. A pair of channel lock pliers, and a flat-head screw driver.

This should be all you need to perform this repair. You may notice we have a coupler off to the side here, not actually attached to the trailer, just so it's easier for us to work with and show you how to replace these parts. First step, we'll pull our pin out, like so. Set it aside. Pull our latch back here, pop out this clip with a screw driver. We'll work the latch or the clop on out.

Now you have a couple options when you're replacing this. You can either cut it off and remove it multiple pieces, or you can slowly work it on out like this. We'll set it aside. Now we need to remove our handle. To do that we'll pop off these clip washers, once you have it off, set it aside.

There's a second one of those clip washers underneath. You can get that one off as well. With that off, set it aside. Push your pin off, remove our handle. We can flip it over and remove our spring. Use the screwdriver.

I'll take our spring on out. There's a pocket on both sides of it that it sits in, one there, one right there. We'll push the spring in place, one pocket, and push it down in the other one. Just like that. How we'll flip it over. This is the main reason while you're replacing this here, is in case our handle was to get damaged for some reason and our coupler operation didn't work properly. We'll put our handle in position, put the new pin in, flip it back over. We'll install our two clip washers. Push down on them and they'll clip into place. We have one started. Get it the rest of the way, we'll squeeze this together a little bit so our pin comes our more. We have one started, all the way on. We'll start the other one. With those both fully on now, we can get our new clip in here. Start one side, work it on up. Now when we pull back on it, we can push in our lock there, slide it back in place and our coupler is now secure over our hitch ball. We'll take our clip, push it in. Now our handle's locked position and our couple cannot come undone from our hitch ball.

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   (108 Customer Reviews)

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


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.


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.


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.


Thank you for your great and timely service.Your videos helped troubleshoot and find the problem.
I do very much appreciate the follow up.
Spring arrived when expected.


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.


The replacement spring fit the receiver hitch perfectly and improved operator safety and convenience.


Arrived promptly, packaged neatly. Always a join to deal with.


Part fit perfectly. Fast and reasonable shipping.


Item was packaged well and delivery was very prompt!


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
Suzz - 11/15/2016


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


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.
Lee - 09/19/2019


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.


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.


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


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!


Great people Will buy from again.


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!


exact match. easy fix


It's nice that you can now just buy the coupler spring instead of the whole rebuild kit.
Great quality at a great price and fast shipping! I would recommend purchasing from !!!


What can I's a spring and does what it's designed to do ;) What I can say is that had it in stock, priced it right, delivered to my door very fast and did a follow up to make sure I was happy...for a spring! They'll have my business for life.


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.


Product was as advertised and arrived in normal shipping time.
However, for the application this spring is way to light weight which is why it was probably missing when I bought the trailer and it did little if anything to help hold the latch open. Not a great value for the money


Great fast service but find a new shipper USPS sucks took 15 days to get it and no tracking information from USPS everyone at the trailer was helpful and courteous


Spring fits perfectly in my coupler. So easy to open it with the new spring!

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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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