bing tracking image
  1. Accessories and Parts
  2. CURT
  3. Tow Bar
  4. Trailer Safety Chains
  5. Safety Cable Parts
  6. Safety Chain Parts
Curt S-Hook with Wire Keeper for Safety Chains and Cables - 7/16" - 5,000 lbs

Curt S-Hook with Wire Keeper for Safety Chains and Cables - 7/16" - 5,000 lbs

Item # C81820
Our Price: $5.14
You Save: 48%
Accessories and Parts
Shipping Weight: 0.46 lbs
Add to cart
In Stock
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


Need help with installation?
Locate installers near me
This durable S-hook lets you easily connect a safety cable or chain to your tow vehicle or trailer. Sturdy, zinc-coated steel hook measures 7/16" in diameter and has a wire keeper. 1-800-940-8924 to order CURT accessories and parts part number C81820 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt S-Hook with Wire Keeper for Safety Chains and Cables - 7/16" - 5,000 lbs. Accessories and Parts reviews from real customers.
  • All Info
  • Reviews (19)
  • Q & A (0)
  • Videos (1)
  • Photos

CURT Accessories and Parts - C81820

  • Tow Bar
  • Trailer Safety Chains
  • Safety Cable Parts
  • Safety Chain Parts
  • S-Hooks
  • CURT
  • 7/16 Inch Diameter
  • 5000 lbs GTW

This durable S-hook lets you easily connect a safety cable or chain to your tow vehicle or trailer. Sturdy, zinc-coated steel hook measures 7/16" in diameter and has a wire keeper.


  • S-hook lets you quickly connect a safety cable or safety chain to any application
  • Wire keeper helps prevent hook from accidentally disconnecting
  • Steel construction is strong and durable
  • Zinc coating resists corrosion


  • Weight capacity: 5,000 lbs
    • SAE Class III
  • Diameter: 7/16"
  • Quantity: 1 S-hook
  • 1-Year limited warranty

81820 5000 lb S Hook by Curt

Video of Curt S-Hook with Wire Keeper for Safety Chains and Cables - 7/16" - 5,000 lbs

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

Video Transcript for Curt Safety Chains and Cables S-Hook with Wire Keeper Review

Hi there safety conscious haulers. Today, we're gonna be taking a look at CURT's S-Hooks with the latch. These are available in either a 3/8" diameter, 7/16" diameter, or 17/32" diameter. That's important for determining the appropriate size to fit through either your safety cable loop and your safety chain. If you're using on a trailer, your safety chains, depending on how thick the diameters of those and the weight ratings are also going to correspond with those sizes. For the 3/8", it's going to have a 2000 pound weight rating, for the 7/16" it'll be 5000 pounds.

and for the 17/32", it'll be 7,600 pounds. And you can see here, we've got S-Hooks installed on safety chains on a pop up camper back here. So they're not exclusive to just flat tow setups. This one here is just a standard one that doesn't have a security latch. So this is a good candidate for an upgrade for one that does have that latch.

So that way they know that they're going to be safe, no matter what, whether they're hitting those bumps down the road, this isn't going to be able to just pop off of there, it's going to stay in place. Just make sure you pick the appropriate diameter and weight for your particular trailer to make sure it'll slide through your chain links and that you've got enough capacity here for the event you do have a catastrophic disconnect. So here you can see why we're going to be replacing our S-Hook here. This is the one we've currently got on here, and you can see it comes off really easily. This particular S-Hook you can notice it's got a couple of holes in it there at the bottom.

Those two holes are where the latch mechanism used to be. It got a little corroded and worn out here, and then it's actually just fallen off down the road. A customer no longer has it. The hook does still function as an S-Hook, but we've lost that extra security of the latching function now. And on the back of these motorhomes, there's so much motorhome that hangs off back behind the rear axle, when you hit bumps and stuff like that, there's a lot of up and down motion and force.

And in most cases, the cables don't move around too much because they're coiled cables. They got some tension on them and stuff like that, that holds them in place. All those major forces going on, it could leave it in a position where it could throw the hook up and it could detach. It's very unlikely, but adding an, that latch in there that it used to have is going to help ensure it stays in place. So we have replacement S-Hooks here with latches that you can get from We've got them in a variety of sizes, so you can make sure you get the appropriate one with the right weight and also the right diameter to fit through your particular safety cable or safety chain, depending if you're installing this in a flat tow setup, or if you're installing this on a trailer. Our release mechanism here, you can see where it slides into those two holes. So it's pretty much identical to the one that was on there before it's going to give us the same functionality. So now we're just going to show you how to get this old one off of here and then how to get the new one installed. So we've gone ahead and brought it inside. We've attached it to our vice here. You could try to spread this apart, however, this is some pretty thick metal. It's extremely difficult to get it clamped tight enough in there to be able to get this spread apart, to slide your cable out. So in most cases, it easier to take your cutoff wheel and just cut this off of here. Now we've got to cut pretty much all the way through. You can just take it off of there and our cable should slide out of there. I have to pop it out of the vice. When you do pop it out of the vice, just cut this, it's going to be really hot. So don't touch that little piece there. So you might have to grab a pair of pliers just to work it off of there. There we go. Now we can go ahead and install our new one. This is simply just going to slide in place just like that. And then we can crimp it down in our vice here. And we just kind of squeezed it until we know it's closed. We'll then just going to loosen it up some. It will likely spread open some. So just want to check to see where you're at. That looks still looks pretty good, no way that that's going to come off of there. So we've now got this attached and replaced. We're ready to go put it back into service on our flat tow set up. And that completes our look at CURT's S-Hooks with safety latch..

Customer Reviews

Curt S-Hook with Wire Keeper for Safety Chains and Cables - 7/16" - 5,000 lbs - C81820

Average Customer Rating:  4.9 out of 5 stars   (19 Customer Reviews)

This durable S-hook lets you easily connect a safety cable or chain to your tow vehicle or trailer. Sturdy, zinc-coated steel hook measures 7/16" in diameter and has a wire keeper.


Seems to me that the factory safety chains that come on trailers are rarely of a sufficient capacity to handle your trailer and all of it's valuable contents in the event of a coupling failure or an accident. These S-Hooks are a great start in beefing up my safety chain system to protect my ATVs and all my camping gear.


These are hooks that I will be using to attach safety chains on a Car Dolly that I pull behind a Motor Home. The price was right, they were in stock and they arrived in a decent amount of time. I'll remember Etrailer for any future needs.


These hooks and chains were far superior to the original equip. I use them on my HD Dump trailer to hold the tail gate as I spread the crusher run. Works great failures


The product was of excellent quality and the price with shipping could not be beat anywhere on the internet.


work like a charm



no worry about hooks bouncing off


Great price, but you'll probably need a vise, special tool or bring it to a shop to squeeze the end on your chains.


I wanted a hook that wouldn't come off by it's self. This works perfectly.


Wow... these work GREAT! Fast shipping and product exceeded my expectations. These make hooking up my in tow car so much faster and easier.


Good product, performed as expected.


2nd order for these hooks. Great quality, quick shipping and exactly what I needed. Thanks


Good solid product that stays hooked.


Product was delivered very promptly, and was just what I needed and when I needed it.


Just what I was looking for and quick d elivery!


Product was exactly as described and packaged to protect it from shipping perils.


Perfect fit!


As advertised. Delivered as promised.



Works exactly as it should.


Good. Just as ordered and received very quickly.


See what our Experts say about this CURT Accessories and Parts

  • Width of the Opening on of the Curt S-Hook # C81820
    The opening on the Curt S-Hook # C81820 measures 3/4 inches. Overall length is 4-1/8 inches. I attached a picture that shows this dimension as well.
    view full answer...
    Image 1 for
  • How To Attach 7/16 Inch S-Hook To Safety Chains
    Since the Curt S-Hook with Wire Keeper for Safety Chains and Cables, part # C81820 is made of 7/16 inch diameter zinc coated steel, I recommend using something like a vise or channel locks if available to crimp the end around your safety chains. If you do not have one at your disposal, you might consider taking it to your local garage or mechanic. They will likely have the equipment needed to get this s-hook attached to your safety chains. This S-hook is made of SAE Class lll steel and...
    view full answer...
  • Size of Safety Chain Hooks on Draw Tite Hitch
    I went to the warehouse to take a look at the safety chain hooks on Draw-Tite Trailer Hitch # 41946 and they measured about 1 inch wide and about 3/4 inches thick at its widest point. I took a look at a number of them and there was some slight variance in the thickness so it is highly likely yours is not exactly that width. It is not absolutely necessary for the spring latch (the catch) to snap shut because in the unlikely event the safety chains come into play the latch really isn't...
    view full answer...
    Image 1 for
  • What to Do When Safety Chain Hooks Wont Fit Holes in Trailer Hitch
    In this situation, most folks either replace the safety chains, using a hook that will fit. Another option would be to use a quick link, like # C82932. Attach the quick link to the safety chain hole in the hitch, then attach the safety chain hook to the quick link. The exact link or replacement safety chain you need will depend on the weight of the trailer. You'll want to choose chains or links with a capacity equal to or greater than the weight of your trailer.
    view full answer...
  • Clevis that Can Fit B and W Safety Chain Loop of 2021 GMC Sierra 3500
    Sounds like you have the B and W Ball and Safety Chain set part # BWGNXA2061 for your 2021 GMC Sierra 3500 which we know the Curt Clevis part # C81980 fits so this might your be your best option to replace what you have.
    view full answer...
  • Recommended Clevis Hook for a Winch and Safety Chains
    I do have options for you but the Curt S-Hook with Wire Keeper part # C81820 is not going to be the best solution for your winch's cable/strap or safety chains. Instead, for the winch I recommend using a clevis hook like part # 6495-401-04 and for the safety chains I recommend using a clevis hook like part # 6495-301-04. The clevis hooks are a much better design for both your winch's cable/strap and safety chains. I have attached a review video of each clevis hook for you as well.
    view full answer...
  • Recommended Safety Chains For A 7,000 Pound Tandem Axle Trailer
    The rating listed for a single chain, like the Curt # C80031 at 5,000 pounds of capacity, will double when two are used. So the # C80031 used as a pair will mean you would have 10,000 pounds of capacity. With that said, I am not a huge fan of the S-Hook design as it can be a pain to get the rubber retainer band piece over the hooks when it's cold out and they can break as well. If you are wanting something that has good capacity and has clevis hooks, which I prefer, check out the Reese...
    view full answer...
  • Length of Curt Safety Chain with S-Hooks # C80031
    Thank you for your recent purchase from etrailer. The Curt Safety Chain with S-Hooks # C80031 that you purchased has an overall length of 48-inches (including the two hooks) and an actual chain length of 40-inches as noted on the product page. Since I do not know how much additional length you require I suggest you take a look at TowReady # TR63035 which has an overall length of 72-inches. Or if you need only another inch or two you could add on Curt S-Hook with Wire Keeper # C81820 or...
    view full answer...
  • Replacement S-Hooks for Trailer Safety Chains
    We can offer you replacement S-hooks with keepers for your trailer's safety chains. You'll just need to find a suitable saw (or helper who can bend the S hook open) to remove the old ones. We have S-hooks in 7/16-inch size # C81820, 17/32-inch # C81830 and 3/8-inch # C81810. You can certainly use a clevis hook like # 6495-301-04 or a Quick Link such as # BX229-0512 if you prefer these over the S-hooks. Cutting your chains down to the correct length will not reduce their capacity so long...
    view full answer...
  • Is Brophy Safety Chain Mounting Bracket MB12 Compatible with Safety Chain 2118-605-04
    The hook end of chain # 2118-605-04 will fit mount # MB12 but the opening in the chain links is too narrow for MB12 to fit. You would need chain # 1483-535-04. I tested this chain and the MB12 and they will work together. Or you could go with an S-hook with a keeper on it like # C81820 and securely hook onto the MB12.
    view full answer...

Do you have a question about this Accessories and Part?

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Frances L
Edited by:
Frances L
Employee David L
Written by:
David L
Employee Jacob T
Video Edited:
Jacob T
Employee Dustin K
Video by:
Dustin K
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee David F
Installed by:
David F

At 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.

Product Experts Available Now!
Call 1-800-940-8924