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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
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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. Call 800-298-8924 to order Curt accessories and parts part number C81820 or order online at etrailer.com. Free expert support on all Curt products. Guaranteed Lowest Price 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 (14)
  • Q & A (8)
  • Photos
  • Why etrailer?

Curt Accessories and Parts - C81820

  • Safety Chains and Cables
  • Tow Bar
  • Safety Cable Parts
  • Safety Chain Parts
  • Curt
  • S-Hooks
  • 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

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   (14 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.

- C81820

Perfect fit! 716106

- C81820

Good. Just as ordered and received very quickly. 591139

- C81820

Just what I was looking for and quick d elivery! 576173

- C81820

2nd order for these hooks. Great quality, quick shipping and exactly what I needed. Thanks 459041

- C81820

I wanted a hook that wouldn't come off by it's self. This works perfectly. 366525

- C81820

Good solid product that stays hooked. 347020

- C81820

The product was of excellent quality and the price with shipping could not be beat anywhere on the internet. 233475

- C81820

Product was exactly as described and packaged to protect it from shipping perils. 228370

- C81820

Wow... these work GREAT! Fast shipping and product exceeded my expectations. These make hooking up my in tow car so much faster and easier. Thanks 215545

- C81820

Product was delivered very promptly, and was just what I needed and when I needed it. 190516

- C81820

Great price, but you'll probably need a vise, special tool or bring it to a shop to squeeze the end on your chains. 130678

- C81820

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. 127390

- C81820

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. 102328

- C81820

Works exactly as it should. 100348


Ask the Experts about this Curt Accessories and Parts

  • What to Do When Safety Chain Hooks Won't 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 # 49135. 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...
  • 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...
  • 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...
    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...
    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...
  • 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...
  • 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...
  • 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...
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Edited by:
Frances L
Written by:
David L
Updated by:
Kristina F
Updated by:
Isabelle B

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