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  1. Straight Tongue Trailer Coupler
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  3. 2 Inch Ball Coupler
  4. 3 Inch Channel
  5. Standard Coupler
  6. 5000 lbs GTW
Fulton Fas-Lok Coupler, 2" Ball, 3" Channel - 5,000 lbs

Fulton Fas-Lok Coupler, 2" Ball, 3" Channel - 5,000 lbs

Item # F343000301
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Straight Tongue Trailer Coupler
Shipping Weight: 5 lbs
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Straight Tongue Trailer Coupler F343000301 - 5000 lbs GTW - Fulton
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The popular and efficient, trigger-style latch on this corrosion-resistant, straight-tongue coupler helps to make hookup quick, easy and secure. Great Prices for the best straight tongue trailer coupler from Fulton. Fulton Fas-Lok Coupler, 2" Ball, 3" Channel - 5,000 lbs part number F343000301 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (353)
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  • Videos (2)
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Fulton Straight Tongue Trailer Coupler - F343000301

  • 2 Inch Ball Coupler
  • 3 Inch Channel
  • Standard Coupler
  • 5000 lbs GTW
  • Bolt-On
  • Fulton
  • Trigger Latch

The popular and efficient, trigger-style latch on this corrosion-resistant, straight-tongue coupler helps to make hookup quick, easy and secure.


  • Channel-tongue coupler is sturdy and simple to use
  • Fast lock trigger-style latch makes for quick and easy trailer hookup
  • Z-Max 600 finish offers superior corrosion resistance


  • Ball size: 2"
  • Channel: 3" wide
  • Distance between side mounting holes: 3"
  • Capacity: 5,000 lbs
  • Limited 5-year warranty

343000301 Fulton Standard Series Straight Tongue Stamped Coupler, 2" Ball, 3" Coupler, 5,000 lbs, Fas-Lok Coupler

California residents: click here

Video of Fulton Fas-Lok Coupler, 2" Ball, 3" Channel - 5,000 lbs

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

Video Transcript for Fulton Fas-Lok Coupler Review

Hi, everyone. Aiden here with And today we're gonna be taking a look at these two trailer couplers from Fulton. These are their fast lock couplers and they're gonna be pretty much the exact same both compatible with a two inch ball both featuring a three inch channel here. So just make sure you pick out the right one for your ball mount and for your trailer. Let's check them out.

So right away, really the only difference between these two is this larger one is going to be a 5,000 pound weight capacity and our smaller or shorter one here is going to be a 3,500 pound weight capacity. So again, just look at what you're gonna be hauling and what kind of capacity you need and pick the right one out for you. They're both gonna mount up the same way though. They've got a three inch hole spacing center to center for those side mounting holes. So all we had to do was just take out our old hardware from our old coupler and pop this one right in, and it was a direct replacement.

One minor thing that we did notice when we we're looking at these is that this 3,500 pound one does have a slightly longer lever here. The actual trigger for the latch right there is the same but this little part that covers it is a bit longer on this one. Like we just mentioned, they do have that trigger style latch. It is pretty easy to operate, get it all locked down. And then of course we'd want to run a pin or maybe even a locking pin through here to make sure it's secure.

You can find those at our site here if you need one. And overall this does feel pretty smooth when I'm operating it. One thing I'd worry about is the longevity of that, though. That is sort of a problem that I've seen with this trigger style latch is that it might be really smooth out of the box but over a long period of time, these parts might begin to seize up a bit, which is why some of those easy latch ones are a bit nicer and easier to use. But we do have a fair few reviews on our site from people who have had this for a year or more saying that it's actually held up really well and that the coating has protected it from any sort of rest or corrosion.

So that's good to hear. And you can see here on the inside of the one that's not installed, as I'm opening and closing that lever, everything in here with the jaw moves really smoothly. So that's really great to see too. These are both gonna have a zinc coating, so that should keep things nice and resistant to rust and corrosion, water shouldn't be too much of an issue especially if you're leaving it outside. Like I mentioned before, the install process is really simple. We just had to take our old one off, put the new one in its place and all the holes lined up pretty well. So just check out how we did it. Now, the first thing you wanna do is make sure you get the old coupler removed and more than likely, if you don't have new hardware set aside you will wanna save this hardware that you take off because the new one will not come with hardware. Then we can take our new coupler and just slide it over where that old one was. And luckily all of our previous holes will line up as well, because we checked that three inch hole spacing. And then we can just run our old hardware back through to attach it. So our holes from the old coupler didn't line up perfectly. All we had to do was just come back through with the drill bit. We kind of use the coupler as a template and just enlarged the holes a bit and everything's fitting much better now. And that's about it for the install. Really, the only thing you gotta worry about is if that hole spacing is correct from your old coupler and if need be enlarge those holes. And then just making sure you've got hardware, whether you're reusing or picking up some new ones. Other than that, though, that's it for this Fulton coupler. Thanks for watching..

Customer Satisfaction Score:

Customer Reviews

Fulton Fas-Lok Coupler, 2" Ball, 3" Channel - 5,000 lbs - F343000301

Average Customer Rating:  4.8 out of 5 stars   (353 Customer Reviews)

The popular and efficient, trigger-style latch on this corrosion-resistant, straight-tongue coupler helps to make hookup quick, easy and secure.


These hubs save time being pre-greased witch means alot for shop production. Shipped on time as always.


Great price on my item. Best customer service in the market in my opinion. Calm, Cool, Collected. Like a well oiled machine.


Our old trailer’s hitch was rusty and this was a no-brainer to fit over the tongue.



This hitch has enabled us to put new life into our old useless trailer.


Ordered on Monday got it Thursday always good service. Coupler works great looks a lot better than the rusty one that was on the trailer. The trailer is aluminum so it looks like new again.


Correct item promptly shipped at a fair price. Thank you!


every component of the trailer for my 17ft boat was getting a little ratty. Salt water is a B. Replaced the jack, winch and coupler with parts from etrailer and don't have a single complaint. Good products, shipped quickly, good support. Thanks all.


Th hitch installed without any problems. The only issue with the hitch is you have to have the ball positioned exacting right or the locking tongue will get jammed and the ball will not seat. It might take a few tries before you get it positioned correctly.





Fast turn around. Replaced the coupler on my Bayliner boat trailor. Works great and heavier than the original equipment.
Thank you etrailer!
Highly recommend etrailer retail!



One year later the Coupler is working Great! Totally met my needs.


Everything I get from etrailer is the best, always a first class product. Service is the best,fast and Jonny on the spot. Your the best none better!


I purchased a fin keel sailboat on a Trail Rite trailer in Oklahoma and upon getting the rig back to Colorado, I had to replace the surge brake receiver as it was completely rusted out. I purchased this receiver to replace the defective hydraulic version as well as purchasing a complete electrical brake system (drums, shoes, wheels, wiring and tires) to complete the changeover. Everything from etrailer has worked as intended.


Exact replacement for same item that came with my Trailex car trailer in 2002. Orig was just tired out from use. E-Trailer was great to do business with.



It was/is perfect. like having a new trailer.


the fas-lok coupler fit perfect on my ez-loader trailer. but payed for 2 day shipping took 5days to get it.

Joe D.


perfect fit


Just installed my hitch to my boat trailer. I replaced my 1 7/8 in ball hitch with the new 2". Mounting holes were identical to my old hitch so it only took 15 minutes to put the new hitch on. Great quality at a good price. I am a repeat customer of etrailer and all has been good.


Looked like a good coupler but I sent it back. Made in China.

Etrailer Expert

Jenny N.


We do have couplers from Demco that are made in the USA. They are part # DM12717 and part # DM15000-52. They are rated at a 10,000-pound capacity.


Hitch coupler arrived and I had it bolted on in about 5 minutes. Looks good and is better than the one it replaced. Thanks for the quick delivery and the video response to a question that I had.


I have a Shoreline boat trailer from the early 90's that needed a new coupler. The coupler I was replacing had mounting holes drilled 1" to center from the top of the outside of the unit. Most couplers place this hole at 1 1/4" from the top which would leave the coupler sitting with a gap between the top of the square beam and the coupler.

If your trailer has this less common hole placement, this coupler is a great looking and functioning unit.


Coupler was as described...excellent build quality and clearly up to the task of towing my 4,500 lb boat/trailer. Fit was very good.

Paul G.


After one year of use, still very happy with this product. Fit and function are excellent. Finish is as good as the day I installed it. Very happy with this coupler.


This unit fit perfectly as a replacement to my factory Aluma trailer coupler, which the latch failed after a a few trips. This unit is clearly built better! Shipped fast and well packaged.


This was nice. I love the easy lock mechanism. High quality and great price. I replaced a hydraulic coupler (went to electric brakes) and this works great. Very easy to load and latch. Used on a 4 place atv/snowmobile trailer.


I ordered this coupler for a Kayak trailer project I'm planning to do.
The price was very competitive and I received it faster than advertised. I'm very pleased with the quality of this product.

Deric M.


Works fantastic, does exactly what I wanted.


Good looking and working hitch that just bolts right on. Easy install!


Received coupler through USPS box had one corner torn but coupler was not damaged. Installed it today, went on without any problems, perfect fit.Thanks Etrailer I'll be using your services again.

Big R.


All is good Thanks Rachael for your follow-up, hoping to be using trailer more this year.


Although made in China, quality appears very good with smooth operation, positive clamping and excellent fit. All hole are properly punched with exacting location. Used this unit to replace a surge brake hydraulic coupler of equal gauge material.


Just wanted to say that etrailer provided the items I ordered in premium condition and the packaging was done in such a manner that all items were protected during shipping. It did take a little longer to get the items than I expected, however, it was worth the wait.


Solid built, but holes for mounting bolts didnt line up. Had to alter my trailer a bit to get bolts into tuonge channel and fit the coupler to trailer.

Show More Reviews

See what our Experts say about this Fulton Straight Tongue Trailer Coupler

  • Bolt Hole Dimensions Fulton Fas-Lok Coupler # F343000301
    The Mounting Holes of the Fulton FasLok Coupler # F343000301 are 1/2 inches in diameter. The center hole to inside top of the coupler is 3/4 of an inch. The two mounting holes on the side are 3 inches apart measured center to center. I have edited a photo for you showing the measurements.
    view full answer...
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  • Tongue Weight Rating on Fulton Trailer Coupler # F343000301
    Yes, the tongue weight capacity will usually be 10 per cent of the couplers maximum weight capacity. On the Fulton Trailer Coupler, part # F343000301, that you have referenced, with the maximum weight capacity being 5,000 lbs the tongue weight capacity will be 500 lbs. Normally, when choosing a trailer coupler the gross trailer weight of the trailer is used because the couplers capacity must be equal to or greater than the gross trailer weight. I am including a link to a FAQ page on trailer...
    view full answer...
  • When Installing New Coupler on Trailer Can There Be Gap Above Trailer Frame
    If you wanted to shim the space you have between the top of your trailer coupler and the bottom of the coupler # F343000301, you could, but if you have the bolts torqued down and you aren't overloading the coupler's 5k capacity you should be fine.
    view full answer...
  • Replacement 5,000 lb Fulton Coupler on 2003 Coleman Westlake
    It's not the latch. It's the hitch ball size. I've done what you did before so don't feel bad, but if you use the correct size ball you will not have to worry about the trailer coming off.
    view full answer...
  • What Size Trailer Frame Does Fas-Lok Couplar # F343000301 Fit
    Basically what that 3 inches is telling you is the width of trailer frame the Fas-Lok Coupler, part # F343000301, fits onto. It doesn't need to be a 3 inch by 3 inch frame but it does need to be 3 inches wide. The channel is the inside of the Fas-Lok that fits over the trailer like is shown in the picture.
    view full answer...
    Image 1 for
  • Bolt Recommendation for Fulton Fas-Lock Coupler Installation
    You would want to use 2, 1/2 inch diameter bolts that are 4 inches in length. I pulled a Fulton Fas-Lok Coupler # F343000301 and checked the installation instructions to confirm the bolt recommendations.
    view full answer...
  • Comparison Between Fulton 5K And 6K Fast-Lok Coupler
    The difference between the Fulton Fas-Lok Coupler with a 5,000 lb capacity, part # F343000301 and the 6,000 lb weight capacity coupler part # F346000301 is just that. The weight capacity. Both are a bolt-on installation, designed for 3 inch channel trailers, have trigger latches, and work with a 2 inch ball. The mounting holes are spaced 3 inches apart and both have the Z-Max 600 finish that helps resist corrosion. While the F346000301 coupler is rated at a higher capacity, it sounds...
    view full answer...
  • Can Welded-On Dico Coupler be Replaced with a Bolt-On Type
    It is certainly possible to replace a welded-on coupler with a bolt-on type so long as the new coupler's capacity is correct for the trailer and it fits the trailer tongue. If you know the trailer manufacturer it is never a bad idea to check with them about doing that retro-fit, just to ensure that they have no concerns about drilling through the tongue for installation of the bolt on coupler. They may also be able to offer you guidance about the bolt grade to use, typically a Grade 5 U.S. I...
    view full answer...
  • Warranty Coverage for Dutton-Lainson # DL13897 Trailer Coupler
    According to my contact at Dutton-Lainson, they do not cover their couplers with a warranty. However, Fulton offers an identical Fas-Lok Coupler, part # F343000301 that's covered by a 3 year limited warranty.
    view full answer...
  • Can Welded On Broken Trailer Coupler be Replaced
    We don't have generic coupler repair kits that I can recommend, but most likely your coupler can be replaced if you take it to a qualified welder in your area. They should have no problem removing the coupler and installing a new one. If your hitch ball is 2 inches the part # F343000301 would work for you. This mounts to a 3 inch channel. If you have a 1-7/8 inch ball you would want the part # T4845000.
    view full answer...
  • Coupler Lock Recommendation for Fulton Fas-Lok Style of Coupler
    Sounds like you have coupler similar to the Fulton Fas-Lok part # F343000301 that you referenced and are looking for a coupler lock for it. A very popular option that will fit and work well is the Fastway coupler lock part # FA86-0015-318. We've found that this lock fits basically all styles of couplers well including the Fas-Lok and does an excellent job deterring theft.
    view full answer...
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  • Is Straight Tongue Coupler Stronger Depending on if it is Bolted or Welded?
    There actually isn't any difference in strength for a straight tongue coupler, no matter if it is bolted on or welded on. Most couplers are designed to be one or the other, and their capacity won't change - and the security to your trailer - will be the same regardless of the installation method. For example, the weld-on Bulldog Collar-Lok Coupler - 2" Ball - 3" Channel Tongue # BD028244 and bolt-on Fulton Fas-Lok Coupler, 2" Ball, 3" Channel # F343000301 both have a 5,000 lb capacity...
    view full answer...
  • Can I Remove A Weld-On Trailer Coupler and Replace it With A Bolt-On Coupler?
    Yes, you can remove your weld-on coupler and install a new bolt-on coupler that fits a 2 inch ball. There is just a few things you need to do to before and when installing. You need to know what channel size and the weight capacity you will need for the new coupler. The most common sizes are the 2, 2-1/2 and 3 inch channels. Coupler, # CT-3001-Z , can be used if you have a 2 inch channel and a weight capacity of 3,500 lbs. If you need a coupler for a 3 inch channel, the Fulton # F343000301...
    view full answer...
  • Recommended Fulton Fold-Away Coupler Hinge Kit Assembly
    The complete Fulton Kit referenced in your question is no longer available from the manufacturer. I recommend looking at the Fulton Fold-Away Coupler Hinge Kit # FHDPB330301. This is designed for 3 inch x 3 inch trailer tongues and has up to a 5,000 pound capacity. This kit includes the mounting hardware, pivot bolts and the pivot pin and clip. If you are also needing the coupler itself, you can use the Fulton # F343000301. For the safety chains, I recommend the 48 Inch Long Safety...
    view full answer...
  • Trailer Coupler Repair Part Recommendations
    In order to find the right coupler or latch for your trailer you will need to know the size of your trailer tongue or the model of the coupler needing the parts. If you have a Fulton 308 Series coupler on your trailer, then the Fulton Repair kit, part # F520801, will work for you. I have attached a link to the product page that lists the coupler repair kits and parts you can take a look at. If you are looking to replace the entire coupler, the size of the trailer channel and the ball...
    view full answer...
  • Folding Tongue Coupler Parts To Create Complete Assembly
    The kit you mentioned has been discontinued, however, I can help you with the individual components. To make this kit, you will want the Fulton Fold-Away Coupler Hinge Kit for 3" x 3" Tongue - Bolt On - Up to 5,000 lbs # FHDPB330301. This will mount to a 3 inch by 3 inch square tube in whatever length you decide which will need to be obtained locally. On the end of that square tube is the Fulton Fas-Lok Coupler, 2" Ball, 3" Channel - 5,000 lbs # F343000301. For the safety chains, you...
    view full answer...
  • Does the Titan Coupler Part T4845000 have the 50 Millimeter Engraved on the Coupler
    Yes, the Titan coupler # T4845000 will have the 50mm engraved on the topside. It also fits 1-7/8 and 2-inch hitch balls. I went to our warehouse to take a picture for you too. Other brands that have a weight capacity of 3,500 pounds and work with a 50 mm ball (1.96 inches) is the Fulton Fas-Lok # F223000301 and Dutton-Lainson channel tongue # DL13800. The 5,000 pound capacity couplers that work with a 50 mm ball (1.96 inches) is the Fulton Fas-Lok # F343000301, Titan # T4845000, # T2343400183...
    view full answer...
    Image 1 for

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Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee Jacob T
Video Edited:
Jacob T
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Aidan B
Installed by:
Aidan B
Employee John S
Video by:
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