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

Fulton Fas-Lok Coupler - 2" Ball - 3" Channel - 6,000 lbs

Item # F346000301
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Straight Tongue Trailer Coupler
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F346000301 - Bolt-On Fulton Straight Tongue Trailer Coupler
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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 - 6,000 lbs part number F346000301 can be ordered online at or call 1-800-940-8924 for expert service.
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Fulton Straight Tongue Trailer Coupler - F346000301

  • 2 Inch Ball Coupler
  • 3 Inch Channel
  • 6000 lbs GTW
  • Standard Coupler
  • 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
  • Fas-Lok 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: 6,000 lbs

346000301 Fulton Standard Series Straight Tongue Stamped Coupler, 2" Ball, 3" Coupler, 6,000 lbs, Fas-Lok Coupler

California residents: click here

Video of Fulton Fas-Lok Coupler - 2" Ball - 3" Channel - 6,000 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

Hey everybody, Ryan here at etrailer. Today we're gonna be taking a look at and showing you how to install the Fulton Fas-Lok trailer coupler. When it comes to a trailer coupler, honestly I feel like they're almost a maintenance item, especially after they've been used for quite some time, 'cause what'll happen, you know, the mechanism just gets dirty and bound up and you know it might get damaged from, you know, trying to force the the ball into the coupler, things like that. And nowadays it's almost more cost effective just to replace the whole coupler, as opposed to trying to rebuild the mechanism inside of there. And that's what a lot of people do, myself included. And so this is gonna work out real well for a direct replacement, or even an upgrade in some cases.

I say that because this is gonna have a 6,000 pound capacity but still work with smaller size trailers, so you get something a little extra heavy duty. This is gonna work or designed to be able to hook up to two inch balls and it's gonna work with trailers that have three inch tongues. So really, really common sizes there. And this will work with a lot of different applications. First impressions of this one, it looks really heavy duty.

I like how the coupler actually comes all the way down the side of the tongue of the trailer there. Something that I noticed though, so I'm a fan of these kind of your classic latch type mechanisms like this. When I first started messing with this one, the first thing I noticed, it's kind of short and stubby and you don't have a ton of space in there. So I'm just thinking, you know, after a couple of years and this gets a little harder to operate, maybe you got a pair of gloves or something on, that might be kind of annoying sometimes, but that's just my opinion. Compared to some of the other ones, here's a similar one with, you know kind of in the same ballpark but this last mechanism is a lot bigger, a lot easier to grab onto.

So that's kind of my preference. This one, too, can adjust real easy on the bottom to kind of set the tension of the ball in there to make it easier to hook up. You can do that with this one too, but you'll have to get some tools out and mess with it. But usually they're cut, they come really close right out of the box and while we're right here, I have a couple other couplers so might as well compare 'em. But when you're choosing one, you know, you kind of check all your boxes is it gonna fit with your trailer the right size ball, proper weight capacities Then from there it's kind of just preference on your latch mechanisms.

So this one's a little different. This is a Demco one, so I think it's easy latch. And how this works, you don't even have to mess with this when you go to hook up, you can literally back your truck up to it and drop the trailer right on it without messing with this. So kind of eliminates one step, you know, is it a huge deal You know, completely up to you. I kind of prefer to manually lock it down, but that's just me. And then there's other styles like this too, which are a little bit different. They kind of have a key way here and that pops open. You would, you know, set the trailer onto your ball and then that will lock down like that. You have a pin on the side there to keep everything locked in place. So, tons of options out there, and you know what one you decide to go with you know is really just gonna be your personal preference on what type of mechanism you like there. Well with all that said, this one is gonna have a protective coating on it to help keep it, you know, protected from corrosion and things like that. And just to kind of give you some measurements here, even though these are all pretty much standard, we'll go over it that way and make sure it'll work with yours. Go from the center of the bolt hole center of the bolt hole. That's gonna be three inches. That's gonna hold true for the ones up top here as well. And then if you we're to go from the top portion down to your mounting hole, that's gonna be about an inch to the center of that hole. So if your existing one has bolts in it already, they're probably the same. Chances are pretty good. It's not gonna come with hardware though, so you'll have to source that separately. The ones I'm using are 1/2 inch, 3 3/4 of an inch long. Nylon lock nuts. Make sure they're, you know, appropriately rated grade five, grade eight at minimum for a lot of applications. And you know one other thing I just like to always recommend, so when you close this, there's gotta be a pin hole in there and what that's for is to be able to put a pin through there or even a lock like this. That way when that's through there this can't accidentally come disconnected. You can lock that down on your trailer. And this is the lock that I use. It's a Flint Hill Goods one, had it for a couple years now, no complaints at all. So not only can you use this when your trailer's in storage to help prevent theft, you know, even though someone could, if they wanted in, they could get in but it is a deterrent. But more importantly I like to use this when I'm towing. That way I know it's not gonna come disconnected. And then when I'm at the boat ramp and I'm gone, you know it's a little more peace of mind knowing that my trailer's kinda locked down to the truck and it's not gonna go anywhere. So these are pretty cheap, cheap investment to keep everything a little more secure. To begin your installation, you first need to remove the old coupler and everyone's set up is gonna be a little bit different, but for the most part, all this information will hold true to get you going. So I removed ours since this is a direct replacement, I just had to pull out two bolts, get that old coupler off and out of the way. That was it. Some couplers will be welded on, and if that's your case, you'll have to carefully kind of cut that weld off. You can use a dremel tool, cut off wheel, and what I found in the past, you kind of get it going, and then you can come in with a pry bar or chisel especially if you have an air chisel and work that off and pry that off there. But be careful not to damage the actual tongue of the trailer. So once that's out of the way, inspect it. You know, ours is in really good shape, but you can always sand it down, get a fresh coat of paint on there, and then start with the fresh base there. So, with that all done, we can get ready to get our coupler on. Go ahead and grab our new coupler and drop this on, and in our case the holes in it line up with the existing holes in the trailer. So I'm just gonna take my old bolts 'cause they are in good shape and run them through. Like I said, everyone set, it'll be a little different if let's say for example, you had a coupler on originally that was welded, you don't wanna weld the new one on. You would have to hold this down flat, make sure it's square and drill half inch holes. You know, you can use these holes as a guide, or if you're gonna weld it, hold it on flat, tack it, and then go around and and finish it up. So pretty straightforward, not a whole lot to it, but we'll go ahead and get our nut started. And I like to get it kind of snug here, and I try to push this down flat, you know, onto the tongue of the trailer. That way it sits good and it'll help pull the trailer a little bit better, too, if it's like that. But I got a torque wrench and I'm just torquing this down to the manufacturer specifications. And that'll finish up our look at of the Fulton Fas-Lok trailer coupler.

Customer Satisfaction Score:

Customer Reviews

Fulton Fas-Lok Coupler - 2" Ball - 3" Channel - 6,000 lbs - F346000301

Average Customer Rating:  4.8 out of 5 stars   (355 Customer Reviews)

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


My old firewood trailer became uncoupled from my truck. I needed a quality replacement so I chose this one. I haven't installed it yet but it looks to be high quality.



I installed the coupler on my trailer and it fit great. I haven't towed with it yet.


I have purchased a few items
thru your page and have always been pleased with the products I get from you but most of all how fast you have always shipped out even during this covid time.

Hitch came out of the box and had it bolted on in less than 15 minuts.





Mark P.




Good product Withstands elements really well
No rust forming around moving parts. Still easy to fasten and open. I recommend it highly if you need one


Fantastic fit. Thank you!


Excellent product with great well-built quality. Just what I needed. Besides, the customer service at eTrailer is second to none - in fact it far exceeds 95% of the companies I deal with.

Mike S.


Its working great, although I did notice a bit of rust starting to form. I plan to put something on it to stop the rust and protect it from further rust. Just surface rust so far.

Etrailer Expert

Rachael H.


Sounds like a great plan, thanks for the follow up.


Great ordering experience. Easy on line site. Intuitive. Very informative (videos etc). Product arrived as advertised. Sturdy. Good quality. No issues.


etrailer has the best product selection and customer service. I recieved my entire order well in advance of the expected arrival date. The quality of the product is excellent. The Fulton Fast-Lok coupler is heavy duty and very secure. Way better than what came with my 14x7 V Nose trailer.

The Super Extra long ball mount solved my problems to get the ball lined up on my Jeep Liberty with the spare tire thats mounted on the rear door. I could not find anything suitalble locally, so etrailer met my needs 100%.


Great product, fast delivery ,good price. I now have confidence in my new trailer hitch.

Original product that came on my new boat trailer was low quality and UNSAFE!


One year review with consistent every day use. Still looks and functions as new,I regularly disconnect and reconnect the next day and ive never had even the slightest problem getting the lock to go down and lock in place. Truly a great product.


Replaced original part on snowmobile trailer. This part is thicker, have no problems opening latch in cold, snow, ice. Solid unit.


Fit right on. Easy to use. Strong. Good price. Shiny!
Would buy again.


I was looking for a Coupler to replace the one on ageing trailer. My Boat is a little of 5k In weight this product fit what I needed and it was extremely easy to install. I chose this one because it is rated over 5,000 lbs. Also etrailer hit it out of the park easy to order and delivered ahead of schedule. I will buy from these guys again


Works very well and easy to install. Would like it to come with installation hardware though.


I used it on a Dr Trimmer log splitter tow bar. I had to redrill the holes on the bar, but it works great.


The product is just what it says it is. But, I'd really like to rave about the service. The coupler shipped the same day it was ordered and they upgraded the promised delivery time. Way to go!!


The coupler looks great despite the box being damaged. This is a good replacement for whats on my trailer now. Price was great too.


Great product! received it very promptly and was the cheapest price I could find. This is a one stop shop for all your trailer needs.


Used this product to replace one that is about 8 years old and rusted. Product appears to be heavy duty. Time will tell how well this China product holds up. The one I had was USA made, but, then again it eventually succumbed to rust. I happy with what I received and customer service was excellent, as always.

Charles P.


Excellent product.Looks like it did, the day I got it.No rust anywhere.Thanks for checking.


Coupler arrived quickly and was exactly what I was looking for. Price, especially with free shipping, was good.


Great product at a great price.
was quick and reasonably priced.
The coupler was exactly as shown - no surprises.
Easy installation.


I haven't put may tires and coupler on may trailer as yet.but I am very pleased with them. Very satisfied with how fast I received them.great job etrailer.


Product was new Have not installed yet but looks good Delivery was fast and transaction was good would use etrailer again


Great product. Exactly as advertised. Arrived early. Fit was perfect, a five minute install. I have several orders with etrailer, never disappoints.


trailer coupler was better than expected, service was awesome,
sales person Pat was friendly and helpful


Operates as expected. Tongue states that it requires four 1/2 inch bolts to achieve load rating...

Show More Reviews

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

  • Replace Trailer Surge Coupler with Straight Coupler on a Trailer With Surge Brakes
    All of that is not necessary. All you have to do is lock out the surge coupler so it cannot move in and out or disconnect the brake lines. By removing the old coupler you would have to remove the brake lines any way. A surge coupler can still be used in this manner. If you do a lot of towing though I would still use brakes. By removing the trailer brakes you are putting more stress on the tow vehicle brakes and will have to replace them more often. But if you want to go with a straight...
    view full answer...
  • Adjusting Latch On Trailer Coupler with Trigger Latch
    To adjust the hitch latch on your trailer's coupler, you will want to adjust the nut at the bottom of the latch. This nut will be tightened or loosened depending on what you need for your coupler. I have attached a diagram showing you the location of the nut that you will want to adjust. The ball needs to be secured in the coupler and unable to simply come off. However, there should be some room for play. The hitch ball needs to be able to move inside the coupler so that nothing binds...
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    Image 1 for
  • Straight Tongue Coupler Mounting Hole Locations To Ensure Vertical and Horizonal Alignment
    The Fulton Fas-Lok Coupler - 2" Ball - 3" Channel - 6,000 lbs # F346000301 you referenced has a 2 inch ball and fits a 3 inch channel. The holes are measured on center at 3 inches apart. The holes will be 1 inch on center from the top and are 1/2 inch diameter. The length from the end to the front of the channel will be right at 5 inches. This is my recommendation for you.
    view full answer...
    Image 1 for Image 2 for Image 3 for
  • Trailer Coupler for 3 inch Wide Channel that Has 3 inch Mounting Hole Dimension
    The Fulton Coupler part # F346000301 that you referenced is a high quality coupler and also covers everything you need as it fits the 3 inch wide channel and has mounting holes that are 3 inches apart on center.
    view full answer...
  • What Would Prevent Fulton Coupler # F346000301 From Fitting on Hitch Ball
    Is it possible you are using the wrong size hitch ball? When the trigger latch of the # F346000301 is fully opened it should easily fit over a 2 inch ball. But if the ball on your trailer is 2-5/16 inch in diameter then it's not ever going to fit.
    view full answer...
  • Can the Fulton Fast-Lok Coupler F346000301 be Welded On
    Yes, if you wanted to weld the # F346000301 to your trailer you could. Since this has a corrosion resistant coating you would want to do this in a very well-ventilated area though.
    view full answer...
  • Can Trailer Coupler Latch be Replaced with Coupler Installed on Trailer Tongue
    If you have a coupler such as the Fulton Fast-Lok Coupler # F346000301 or something similar then there is access to the fasteners that hold the latch to the rest of the coupler from underneath. Remove the nut from underneath and take note of how all the parts go together. Reverse the order when ready to reassemble the latch.
    view full answer...
    Image 1 for
  • Are Trailer Coupler Mounting Holes The Same And Is A Brake Controller Needed For Electric Brakes
    The standard, basic straight tongue coupler I have that will fit a 3 inch channel, and a 2 inch ball with a 6,000 lbs. weight capacity is the Fulton Fast-Lok Coupler with Cast Ball Clamp, 2 Inch Ball, 3 Inch Channel - 6,000 lbs, part # F346000301. It has the 3 inch spread between the side mounting holes. As long as the tongue has not been modified the distance from the front of the channel to the first hole will be the same on all of the bolt-on couplers. When your trailer has electric...
    view full answer...
  • Trailer Coupler Trigger Latch Position and Ensuring Correct Fit
    The Fulton Fas-Lok Coupler - 2" Ball - 3" Channel - 6,000 lbs # F346000301 will not be under the ball all the way to the hitch ball shank but it will be on the under side of center. It is possible for a latch to be installed incorrectly and not hold the ball while the trigger latches. I recommend checking it to make sure it is installed correctly and that you can't physically lift the trailer off the ball while latched. The wear on the ball should be above center from the tongue weight...
    view full answer...
  • Replacing Surge Coupler with Standard Coupler on Boat Trailer
    Actually, if the latching portion of the coupler still works correctly, you can simply engage the manual lockout lever on your coupler which will prevent the coupler from compressing and trying to apply the brakes, allowing you to continue using your existing coupler. If you really want to replace the existing surge coupler, the Fulton # F346000301 would fit your 3 inch wide trailer tongue. The mounting holes are 3 inches apart on center, if that doesn't match the existing holes in your...
    view full answer...
    Image 1 for
  • Parts Needed To Convert Hydraulic Disc Brakes To Electric Drum On a Four Wins Boat Trailer 5,200LB
    To replace your hydraulic brakes with electric brakes on your Four Winns boat trailer you will need the following parts. Dexter Nev-R-Adjust Electric Trailer Brake Kit # 23-458-459 qty 1 Easy Grease Trailer Hub and Drum Assembly # AKHD-655-6-EZ-K qty 2 Bright Way Push-to-Test Trailer Breakaway Kit # 3802346 qty 1 Trailer Wiring 7-Way Upgrade Kit w/ Junction Box # HS381-9000 qty 1 Fulton Fas-Lok Coupler # F346000301 qty 1 You will need Wire # 10-1-1 which is sold per foot to run to the...
    view full answer...
  • What is the Maximum Tounge Weight Capacity of the Fulton Fast-Lok Coupler - 6,000 lbs
    Trailer couplers are not rated for tongue weight capacity. They are rated for Gross trailer weight, as long as the gross trailer weight is within the capacity of the coupler, the coupler is installed properly and the trailer is designed properly, the coupler will handle the tongue weight of the trailer. Proper installation of the coupler is the key to it handling the weight it is rated for and the manufacturers directions should be followed explicitly.
    view full answer...
  • Replacing an Actuating Coupler on a Magic Tilt Boat Trailer with a Standard Straight Tongue Coupler
    We have many standard straight tongue couplers that will fit your 3 inch x 4 inch trailer tongue. I have attached a link to all of our straight tongue couplers for you to check out. You can simply select the weight capacity that you need and the hitch ball size to choose the correct coupler. One coupler you may be interested in is the Fulton Fast-Lok Coupler, # F346000301. This coupler uses a 2 inch hitch ball, has a 6,000 lb weight capacity and will fit on your 3 inch wide tongue. It...
    view full answer...
  • Why Would Trailer Coupler Latch Cut into Hitch Ball
    Sounds like the latch of your Fulton Fast-Lok Coupler # F346000301 is either adjusted too tight and/or is damaged. The nut you see on the bottom of the latch, try loosing it slightly to see if it end up putting less stress on the ball. You will want to test fit a 2 inch hitch ball in this coupler to make sure it is tight enough to be secure but not too tight.
    view full answer...
  • Can Fulton Fast-Lok Coupler, # F346000301 Be used on a Majic Tilt Aluminum Trailer
    An aluminum trailer does not necessarily require a specific amount of bolts for the coupler. But the coupler will require a certain number of bolts. You old heavier surge coupler was probably a lot longer and needed 3 bolts. The Fulton Fast-Lok Coupler, # F346000301, is smaller and only needs 2 bolts. The third hole should be capped or plugged or even run a bolt through it to help keep out moisture and road grime. I recommend that you get a coupler that has the same bolt hole size and...
    view full answer...
  • Coupler Recommendation for 12k Boat Trailer with 3 inch Wide Frame and 2-5/16 inch Hitch Ball
    We have the Decmco Channel Coupler part # DM13203-95 which would work well for a bolt on option. This fits 3 inch wide channel, is designed to fit a 2-5/16 inch ball like you have and has an 18k capacity. For a similar weld-on coupler we have the part # DM12662-97 which comes primed for paint as well. Either would be a great solution for use with the Hydrastar part # HBA16 you are planning on installing.
    view full answer...
  • Recommended Parts Needed to Convert Boat Trailer from Hydraulic to Electric Drum Brakes
    Electric drum brakes are being found on boat trailers more and more these days since they are generally more cost-effective and easier to install than hydraulics. Converting your tandem axle Calkins trailer from hydraulic to electric drum brakes means you'll no longer need brake lines or a surge coupler. You can keep your existing coupler if you like but you'll need to drill a hole through it side to side and install a bolt and nut to immobilize it. If you prefer you can install a new...
    view full answer...
  • Mounting Hole Spacing for Fulton Fast-Lok Coupler F346000301
    I went to our warehouse to measure the mounting hole spacing on Fulton Fast-Lok Coupler # F346000301 and found that the distance from the top surface of the coupler housing down to the center of the side mounting holes is 1-inch. This and other dimensions are noted on the photo I prepared for you.
    view full answer...
    Image 1 for
  • 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...
  • Recommendations for Replacing an Atwood Trailer Brake Actuating Coupler
    You would want to replace an actuating coupler with another actuating coupler. The Fulton coupler, # F346000301 is a standard coupler so you would not have any brakes when using this coupler. I recommend the Titan, # T2480000. This coupler does not have an electric reverse lockout so you would either need free backing breaks or a separate lockout like # T4748800 that will need to be connected to the reverse light circuit on the vehicle. No more getting out of the truck or levers to pull....
    view full answer...
  • Using 6000 lb Rated Coupler for 3500 lb Boat and Trailer
    As long as the tongue on your trailer is 3 inches wide, the Fulton Fast-Lok coupler will work fine for you. There is nothing wrong with a little overkill. Keep in mind that the higher weight rating of coupler will not increase the weight rating of your trailer, as any towing system is only as strong as its lowest rated component.
    view full answer...
  • Fulton Straight Coupler Installation and Torque Specifications
    Thanks for the pictures. Torque specs on couplers, like the Fulton Fas-Lok Coupler item # F346000301, are changed all the time by the manufacturers. It doesn't look like you damaged the coupler by torqueing it to 55 lbs. I recommend keeping the bolts at 55 lbs and not trying to go back to 35 lbs.
    view full answer...
    Image 1 for Image 2 for
  • What Mounting Hardware is Needed to Bolt on Fulton Fast-Lock Coupler # F346000301
    The Fulton Fast-Lok Coupler # F346000301 that you referenced does not come with mounting hardware. My technical contact at Fulton informed me that more likely than not these couplers are welded so sending hardware is not necessary. I will e-mail you separately the bolt on directions, however this coupler uses the Class III bolting instructions which are as follows: 1: Assure couplers internal stop is butted against end of trailer tongue for maximum overlap 2: Use four (4) 1/2 inch...
    view full answer...
  • Would Loose Coupler Bolt Cause Coupler to Disconnect from Hitch Ball
    Even if the coupler was barely attached to the trailer the latch system would still hold the hitch ball assuming everything is working properly. The reason your hitch ball became separated from the coupler is due to the latch and not the loose coupler bolt. It's' definitely time for a new coupler!
    view full answer...

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