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Curt Fish Wire Bolt Leader - 1/2"

Curt Fish Wire Bolt Leader - 1/2"

Item # C58400
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This bolt leader helps you easily pull 1/2" bolts or other hardware through hard-to-access holes in your vehicle's frame. The fish wire tool helps you install a trailer hitch receiver, fifth-wheel rails, gooseneck hitch, or other items. Call 800-298-1624 to order CURT accessories and parts part number C58400 or order online at Free expert support on all CURT products. Guaranteed Lowest Price and Fastest Shipping for Curt Fish Wire Bolt Leader - 1/2". Accessories and Parts reviews from real customers.
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  • Reviews (120)
  • Q & A (0)
  • Videos (1)
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  • Why etrailer?

CURT Accessories and Parts - C58400

  • Trailer Hitch
  • Gooseneck Installation Kit
  • Fifth Wheel Installation Kit
  • Tools
  • Bolt Leader
  • CURT
  • 1/2 Inch

This bolt leader helps you easily pull 1/2" bolts or other hardware through hard-to-access holes in your vehicle's frame. The fish wire tool helps you install a trailer hitch receiver, fifth-wheel rails, gooseneck hitch, or other items.


  • Lets you guide bolts and mounting blocks through hard-to-reach holes in your vehicle's closed frame
  • Helps position bolts while you are installing hitch receivers, gooseneck hitches, or 5th-wheel rails on certain applications
  • Constructed of spring steel
  • Assembled in the USA


  • Application: 1/2" bolts
  • Length: 18"
  • 1-Year limited warranty

58400 1/2" Fishwire by Curt

Video of Curt Fish Wire Bolt Leader - 1/2"

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

Video Transcript for Curt Tools - Hitch Tools - C58400 Review

Today we're going to take a look at the 1/2 inch fish wire bolt leader. This bolt leader will help easily pull a 1/2 inch size bolts or other hardware through any hard to access holes in your vehicle's frame. This fish wire tool helps install the trailer hitch receiver, fifth wheel rails, goose neck hitch, or any other items. Basically it lets you guide the bolts and the mounting blocks if required through hard to reach holes in your vehicle's closed train. It'll help position the bolt while you're installing the hitch receiver, the goose neck hitch, or the fifth wheel rails on certain applications. This leader is constructed of a spring steel. Again, the application spreads onto a 1/2 inch diameter sized bolt.

Overall length on this leader from end to end is about 20 1/2 inches. When you go to install it, I happen to pull here is a 1/2 inch carriage bolt that would be used on a lot of trailer hitch installations we do here. Here's a spacer block or mounting block that you would be also used on some applications. Basically there's two different methods. The regular fish wire method would be when you run this wire through the two holes.

Once it's through the two holes you can connect it to your bolt and to your mounting block, if you prefer if it's required. Once you thread that all the way on, and you can pull it through the mounting block, and then this is already through the two holes, so you'll get this to fit through the first hole. When you get to the second hole the spacer block or mounting block would be used to hold it in position and to pull the bolt through the hole and then just unscrew the bolt leader from the bolt. This would be in position in the second hole that you wanted it in to be able to attach your hitch or whatever you're installing to your vehicle. The other way is a reverse pull method. What that is is when you take the bolt and mounting block altogether and go ahead and screw this on the bolt leader to the end of it. You do that first and then you run your fish wire through the hole into the frame, and then pull the bolt with the mounting block.

Again, the mounting block would be used to go get at the support in the frame. You pull the bolt through that hole and in the same way just detach the bolt leader from the bolt. You'd be all ready to go again. That should do it for the review on the 1/2 inch fish wire bolt leader.

Customer Reviews

Curt Fish Wire Bolt Leader - 1/2" - C58400

Average Customer Rating:  4.8 out of 5 stars   (120 Customer Reviews)

This bolt leader helps you easily pull 1/2" bolts or other hardware through hard-to-access holes in your vehicle's frame. The fish wire tool helps you install a trailer hitch receiver, fifth-wheel rails, gooseneck hitch, or other items.

- C58400

great price and its a tool you will have for years, worked flawlessly, made getting bolts in for trailer hitch so much easier

still have the tool, and have used it several times,it just keeps being needed when installing hitches
Russell A - 10/30/2020

- C58400

Works perfect for fishing bolts through my Lexus frame to install receiver hitch

- C58400

Very easy to use Work excellent

- C58400

Make sure you order the right size one of these. I did not know there were different ones. And get 2 or 3 at a time because they will break. I did not know that the hitch I had ordered had come with one of these. Its ok tho, because I needed this one after all. Turns out these things are essential to mounting the hitch. I needed to use (6) bolts. By the grace of God I was able to get 5 of the bolts thru. This thing broke off on the 5th one and I was able to use needle nose pliers to get the last bolt thru. Turns out I could NOT get this to un-thread off the bolt, so each time I had to tug on it to get it free from the bolt. I tried this one I bought for the last bolt, and turns out it was for a bigger bolt and would not fit thru the steel clips. I rigged it and was able to at least get the last bolt thru before this one broke also. I would strongly suggest re-engineering this to be more ductile and "flexible". I was hoping it would flex back to position but that was not the case, Instead it just snaps - sign of wrong material selection.

- C58400

Excellent customer service. Thank you!

- C58400

Worked great and made the bolt installation easier!

- C58400

Very handy when installing the hitch receiver bar to a 2004 Honda Civic 4-door. Once tightened the bolt a bit too tight - had to do some prying to get it off. Nice that the wire was a bit curved, as it guided itself through the out-hole. I also used a magnet to grab the wire end.

- C58400

Well made.

- C58400

Worked perfect after I got over the operator error (glad I ordered 2). Had to drag a bolt over a frame piece and then into a hole while under my car.

Havent need it since, but glad to know I have it just in case.
William - 03/05/2019

- C58400

Product worked like a charm pulling Trailer hitch bolts through the frame and down into the holes. Hitch was installed in 20 minutes.

I only needed it for one installation trailer hitch. It worked great and made the job a lot easier. Great tool! Thank you!
Salvatore G - 05/05/2016

- C58400

I ordered the Draw-Tite Trailer Hitch for a 2017 Equinox and it shipped quickly and instructions were very clear for the installation. The Hitch also came with two 1/2 wire bolt leaders and I had ordered an additional one as well. The bolt leaders needed to be connected together to reach from the opening to the guide holes for the bolts. Once connected, that extended the length and it worked perfectly to pull the two center bolts into place. All bolts and nuts fit perfectly. The 1 1/4 hitch works great with my bike carrier and any small carts that I need to pull.

- C58400

What great service from this company, I've purchased 2 hitches from them and each time the transaction was perfect. My recent purchase was some extra parts to reattach my previous hitch to my new car (same model 3 years newer). During this global pandemic things aren't moving as fast as previous years and with a holiday weekend, my parts would take longer to get here. Paula went out of her way to get them to me in a few days...not weeks. I was so happy to get them early and excited to get it on my car......but the 108° weather put a halt to that. This weekend it's going on my car and all will be good in the neighborhood. Thanks ETRAILER.COM for all your great associates and products..

- C58400

I have been very pleased with the hitches and service from etrailer. I bought from them more than once for each of my Subarus. I am definitely a return customer.

- C58400

The hitch is good, the installation videos are a great help. The delivery was faster than expected. Thanks

- C58400

These fish wires are amazing. If you did not have these you could not install the hitch on our Dodge Dart; there is no other way to fish those bolts and rectangular washers up inside the torque box to the holes they must be inserted through in order to then bolt the hitch in place. They are worth every penny and worked like a dream.

- C58400

Made threading the bolts very simple

- C58400

This carriage bolt block was impossible to find locally. Couple this with the bolt leader wire and the how to video on this website and I had zero issues. I was actually amazed at how quickly I was able to fish the bolt/spacer combo into the frame of my car to fix the broken weld but issue. Now all I need is the bolt up the hitch. Thanks etrailer!

- C58400

Installing A trailer hitch would be impossible without a bolt feeder! 18 inches of wire gave me enough to feed the bolt and flat washer through the slot in the frame and drop it down through the hole into the hitch. Fast turnaround from the time I ordered until I received in the mail thanks George and the crew at Etrailer.

- C58400

It is very handy, having some thing helping in getting a bolt TO & Through a hole in the frame to mount Hitch Receivers. Having an assortment of all the size bolts required is a neccesity.

- C58400

The Fish Wire Bolt Leader made putting my trailer hitch on much simpler than it would have been without it. I highly recommend this product. I sent back and bought other sizes in case I need them for similar jobs. This is too handy of a tool not to have.

- C58400

Great service !

- C58400

The trailer hitch receiver kit came with one of these so I ended up not using this, but I tested it out anyways just to get some value out of it and it worked flawlessly. Two thumbs up!

- C58400

I don't typically leave reviews. But my hitch installation was a breeze. Additionally I had to by spacer blocks and a lead wire to use instead of the weld nut. etrailer was super helpful and helped me figure everything out! Great customer service!

- C58400

Absolutely no way to do the job without this tool. If you have a buick lesabre, get this when you buy your hitch.

- C58400

This small tool is an absolute must when installing a hitch (size depends on the make of your car/truck). It turns an all day aggravating job into a painless 30 minute one.

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Info for this part was:

Employee Frances L
Edited by:
Frances L
Employee Jeff D
Installed by:
Jeff D
Employee Conner L
Installed by:
Conner L
Employee Jameson C
Expert Research:
Jameson C
Employee David L
Written by:
David L
Employee Kathleen M
Video Edited:
Kathleen M
Employee Dustin K
Video by:
Dustin K
Employee Randy B
Test Fit:
Randy B
Employee Wilson B
Updated by:
Wilson B
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
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