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Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long

Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long

Item # 166079
Our Price: $12.65
Trailer Leaf Spring Suspension
Shipping Weight: 0.34 lbs
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166079 - 3-1/2 Inch Long ABS Fasteners Trailer Leaf Spring Suspension
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9/16" Diameter spring-retainer bolt is used to mount slipper spring inside front hanger. Includes locknut. Great Prices for the best trailer leaf spring suspension from ABS Fasteners. Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long part number 166079 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (450)
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  • Videos (1)
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ABS Fasteners Trailer Leaf Spring Suspension - 166079

  • Suspension Bolts
  • Camper
  • Car Hauler
  • Utility Trailer
  • 3-1/2 Inch Long
  • 9/16 Inch Diameter
  • ABS Fasteners

9/16" Diameter spring-retainer bolt is used to mount slipper spring inside front hanger. Includes locknut.


  • Suspension bolt attaches leaf spring to front hanger
  • Included locknut secures in place on bolt


  • Diameter: 9/16"
  • Length: 3-1/2"

166079 Spring Eye Bolt with Nut - 3-1/2" Long


Video of Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long

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

Video Transcript for Review of Trailer Leaf Spring Suspension - Spring Mounting Hardware - 166079

Jeff: Hello, everybody. This is Jeff at Today, we're going to take a look at the 9/16th diameter, 3 1/2 inch long spring eye bolt with the lock nut for slipper springs. Now this 9/16th diameter spring retainer bolt is used to secure the slipper spring to the front hanger of your slipper spring trailer suspension. The 3 1/2 inch long bolt is common on trailers that have a 6,000 pound or 7,000 pound axle and uses 2 inch wide leaf springs.Now, the bolt itself is a grade five bolt. The way we can tell that is, if you look at the head, you'll see three lines on it.

That'll indicate that that meets the grade five designation. The length on this is 3 1/2 inches, and that's measured from under the head to the end of the bolt, so there's your 3 1/2 inch length. Diameter of this bolt is 9/16th of an inch. The thread size on the end here that the lug nut or the block nut attaches to is 9/16th by 18 threads per inch. Now the bolt head size is a 13/16th of an inch, and let's show you here's a 13/16 socket.

Oops, wrong one. Here's the 13/16 size socket. You can see it fits securely on there.And the lug nut size uses the 7/8th inch size socket, and that's the first one here I pulled. And you can see that fits exactly on there. And this included lock nut is what will secure this bolt to the spring eye.

But that should do it for the review on the 9/16th diameter, 3 1/2 inch long spring eye bolt with the lock nut for slipper springs.

Customer Satisfaction Score:

Customer Reviews

Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long - 166079

Average Customer Rating:  4.8 out of 5 stars   (449 Customer Reviews)

9/16" Diameter spring-retainer bolt is used to mount slipper spring inside front hanger. Includes locknut.


Just what needed for my trailer. My old leaf springs were so rusted that I was one pot hole away from being broken down on the side of the road. These new ones are perfect.


When I asked questions about my order they answered back quickly. Everything fit like it should. Yes time will tell if the springs are good.


Great Experience!

When I noticed
that the leaf springs on my 44 year old boat
trailer had cracked I thought I would never find replacements.
I fully expected to have to have something custom built.

I was amazed when I found the fantastic diagrams/descriptions
dimensions for replacement springs on

The phone support person was wonderfully helpful in confirming
if items were in stock and ready to ship. The replacement springs
arrived on time and everything bolted up perfectly!

Thanks for such a great site!


Two of the bolts were sent as the wrong size...they were properly labeled, but were 9/16 instead on 1/2. Kylie requested photos of the bolts to "prove" they were incorrect which kind of frustrated me further. She is sending new ones to me soon. One of the hub kits arrived with the seal broken and the contents were scattered in the shipping box, but all the parts from the kit were there, so no harm done.


I will be disassembling and do a further visual coming up. But what I did see while on the trip is that it definitely looks as the rollers (gold colored like a grade 5 - 8 bolt, I'm assuming they are hardened) that are in the system to roll on the slipper springs are showing wear.


I have purchased a number of items from such ans leaf springs, axle and hub assembly, and other items as well, I recently finished the trailer and it is now on a cross country trip. The trailer has just finished a 3,000 mile leg of this trip and I am told it was so smooth that it could not be felt by the towing vehicle.

Every product I have ordered from has been top quality and has worked extremely well. I would come back again for any of my future trailer needs.

Robert H.


The trailer has since been on a second cross country trip and it is still working just like it was the day I finished it.


Great company to do business with and very knowledgeable assistants! Recommended


Bolt was a great replacement


Quick delivery and product as described


I have bought many different products from Etrailer and the staff have been more than helpful and I would recommend this company.



It’s been a year already! How time flies. Every things still working great thanks again.


Super service getting all the right parts. I received the parts in just two days it took about one hour to change both springs .everything fit grate back on the road.thanks


Great products from e trailer. They work as expected and hassle free. Even better prices.



The trailer springs and brackets have been great no issues at all. Very pleased with etrailer products.


Very good service and very good parts as usual!


Right size


Customer Service was / is excellent. Timely delivery easy ordering process. Correct parts and easy to install Great Company and would use again when I need to


I received the order to late to use before my road trip.In total, it took 27 days to receive my order. I placed my order on September 1st and received the package on the 8th. Whomever packaged the order used a very larger box and three sheets of packaging paper. By the time I received the order it was missing half of the items I ordered. I emailed etrailer immediately and received a response quickly. I was told that a replacement order was sent to their warehouse or shipping department and they would send the replacement parts. However, this is where things started to brake down. I asked for a projected delivery date and i was told that it usually takes 3 to 5 days once it ships and they would send me an update once it shipped. On the 14th I still had not received an email stating the order had shipped so I emailed etrailer again. I left on my road trip on the 15th so did not have the time to check my emails until the 19th, and found I had not receive a reply yet so i sent another email. The response I received stated that they had sent me an email on the 14th to notify me that one of the missing items from my original order is now back ordered. I reviewed my email inbox and junk mail on three devices that receive all mail sent to my email address. I did not receive an email from etrailer as stated. Bottom line, i didn't receive the replacement items until the 27th. This put me on the road without the trailer parts I was counting on for my trip. I'm not a satisfied customer.


I get the correct hardware every time!


Melissa @ eTrailer was simply the best. She took the time to confirm the leaf springs were the correct size for a trailer I am rebuilding. Received the parts on time. Could not have done better with any other company.


worked as advertised.


Very impressed by the rapid processing and shipment of my two orders from ETrailer for my replacement trailer slipper leaf springs, spring eye bolts, U bolt mounting kits, and spring seats. I wanted to have an extra set of spring to carry along in case of emergency during an extended road trip hauling two dirt bikes. My orders were delivered with plenty of time to make our trip. Will definitely order from ETrailer for future parts needs. Thanks!


These bolts were excellent for bolting things together. I had tried using a whittled down stick of butter at first, but couldn't get any respectable longevity out of it. Then I found these bolts and my world was turned upside down! No more time wasted shaping butter sticks to fit my trailer suspension. These bolts come correctly sized right from the factory! No more embarrassing incidents of my axles falling out as the butter melted and turned soft. If you need to secure your axles to your trailer, these are the bolts for you!!


The chat option helped with finding the items we needed. Loved the online videos. Item shipped promptly with great communication. Excellent customer service.


The original spring bolts were 1/2" these are 9/16" and I had to enlarge mounting bracket holes but satisfied with these stronger bolts. The springs and all other hardware high quality at a very good price.

Patrick M.


Great. Quiet, firm ride. Handles great.


Best site for trailer parts
you would need


I paid to have my parts shipped overnight. What I recieved was someone elses parts.... So now I am waiting another 2 days for hopefully the correct pats to be shipped while i return ship the incorrect parts. I was told to leave the wrong parts on the doorstep for the UPS guy. SO now i will sitting in the house waiting for the UPS guy and hoping the porch pirates dont come first.

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Info for this part was:

Employee Jeff D
Installed by:
Jeff D
Employee Randy B
Installed by:
Randy B
Employee Jameson C
Expert Research:
Jameson C
Employee Kathleen M
Video by:
Kathleen M
Employee Wilson B
Updated by:
Wilson B
Employee Eric H
Updated by:
Eric H

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