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

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Our Price: $6.65

Trailer Leaf Spring Suspension

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Shipping Weight: 0.35 lbs

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Redline Spring Mounting Hardware - 166079
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  • Suspension Bolts
  • Spring Mounting Hardware
  • 3-1/2 Inch Long
  • Redline
  • 9/16 Inch Diameter
9/16" Diameter spring-retainer bolt is used to mount slipper spring inside front hanger. Includes locknut. Lowest Prices for the best trailer leaf spring suspension from Redline. Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long part number 166079 can be ordered online at etrailer.com or call 800-298-8924 for expert service.


  • All Info
  • Reviews (167)
  • Q & A (21)
  • Videos (1)
  • Photos
  • Why etrailer?

Redline Trailer Leaf Spring Suspension - 166079

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


Features:

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


Specs:

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


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

91635B







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 Redline Trailer Suspension 166079 Review

Today we're going to take a look at the 3 and 1/2 inch long spring eye bolt with the lock nut for the slipper springs. Now this bolt will secure your slipper leaf 00:00:09 spring to the front hanger of slipper spring trailer suspension system. It does include this lock nut to secure the bolt into place. A few specs on this, the bolt is a grade 5 bolt. Overall length which would be measured from under the head to the very end, is going to be right at 3 and 1/2 inches long. The bolt size is a 9/16 diameter by 18 threads per inch.

The bolt head size is 13/16 of an inch. I've got an example, here's a 13/16 socket and you can see it fits exactly onto the head of the bolt, as in the lock nut which goes on the inaudible 00:00:45 here. The size of the lock nut is going to be a 7/8-inch head and there your 7/8-inch nut on there. That should do it for the review of the 3 and 1/2 inch long spring eye bolt with the lock nut for slipper springs.


Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (167 Customer Reviews)

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

- 166079
by:

All Parts for trailer suspension fit perfectly. Shipping was lightening fast. Excellent products and service. 381987


Comments

Several long trips under it’s belt now. Working like a champ!

Dave S - 05/18/2018

38642

- 166079
by:

Just what I needed shipped very quickly 553405



- 166079
by:

I should have over-rode the website software that directed me to the parts I needed. I should have ordered 3" inch bolts instead of 3 1/2". The software did ,end me to all the other correct parts to replace my leaf spring. I was able to use the bolts anyway with the new and old shackles combined to take up the extra space. All of the other parts and leaf spring worked out fine. 509033



- 166079
by:

Worked great. 581353



- 166079
by:

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 etrailer.com 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! 84055



- 166079
by:

I have purchased a number of items from etrailer.com 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 etrailer.com has been top quality and has worked extremely well. I would come back again for any of my future trailer needs. 392462


Comments

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.

Robert H - 06/27/2018

40227

- 166079
by:

Stripping down a 16 year old 21 ft. salt water use trailer - from end to end. The folks @ etrailer were very knowledgeable, and helpful in my decision making. From placing the order, to tracking the order, to the way the items were packed for transit. Other distributors could learn from these people; in regards to customer service, following up, both office and warehouse. Unloaded the products last night, nothing short, all quality in regards to their products, with great pricing. The installation videos are a big bonus, and something I'll be taking advantage of, during the restoration. Will follow up with picture, (before and after) when I'm done 337537



- 166079
by:

Arrived on time. Great price and good q uality. 683369



- 166079
by:

Fit was perfect! 682639



- 166079
by:

Good web site for shopping on line. 677933



- 166079
by:

Excellent quality and fast shipping. Thanks 677305



- 166079
by:

The springs and accessories that I bought are performing great. I'm very happy with the products and services. 672952



- 166079
by:

You Da Man!!! Perfect fit, boat and trailer has never pulled that smooth before.. thank you for the speedy shipping also. 672558



- 166079
by:

been ordering from here for a few years and we have never had anything ever put on backorder,it's always right and the fastest shipping around..need more place's like this 671474



- 166079
by:

The product seems to be made of quality material and properly sized for my application. 667531



- 166079
by:

Everything arrived in fast and tracking was accurate. parts were just what I needed. Quality operation. Thank you etrailer. 664536



- 166079
by:

I really appreciate the great service I received from etrailer each time I've ordered what up order has been accurate and it's come exactly on time and I really appreciate that thanks a lot 659932



- 166079
by:

I ordered a fender, springs,8 and misc parts for my magic tilt boat trailer to get it back in good condition. Everything was exactly what I ordered and worked great. The order was delivered in two days with free shipping The customer service was also very helpful (thanks Taylor ) Only place to go for your trailer needs. 656435



- 166079
by:

everything was great very happy with all the stuff I bought 654506



- 166079
by:

Everything I have purchased from etrailer has worker perfectly ! Spring kits, trailer hitch and wiring . All fit perfect and the shipping is amazingly fast . 644969



- 166079
by:

The bolts are a heavy grade 8 bolt and have the ridges by the head of the bolt. These are handy as the dig in and help the bolt from slipping as you tighten it. Even though it is listed as an add on item for the 1 3/4 leaf spring set, the bolt is slightly to long for this application. You will need to put washers on so the nut will tighten. 636985



- 166079
by:

Very good I got what I need on time, price lower that other store. 636874



- 166079
by:

#166079 Was correct size and worked gre at 636197



- 166079
by:

They are what they are...bolts. And they worked perfectly. 634514



- 166079
by:

Fit like a glove 629607



- 166079
by:

Order was exactly as described, shipped promptly and of good quality. 618053



- 166079
by:

great price 611960



- 166079
by:

Good quality fast shipping 608208



- 166079
by:

Fit as it should,price was good and fast shipping. 604742



- 166079
by:

Great fit, excellent customer service. 594338



- 166079
by:

Great product. Replaced it along with my springs on my personal trailer. Does the job well 590020



- 166079
by:

I have bought many different products from Etrailer and the staff have been more than helpful and I would recommend this company. 586260



- 166079
by:

The product worked as desired and is on my trailer 571350



- 166079
by:

Fit as described. Fast shipping 563711



- 166079
by:

Great product great people to work with .. 562235



- 166079
by:

Looks quality 544720



- 166079
by:

Quality parts for a great price. I now have a trailer with better suspension than when I bought it. I am confident it will carry the loads I haul in it for years to come. 520762



- 166079
by:

Worked perfectly 513800



- 166079
by:

Fast delivery and right fit. 511342



- 166079
by:

I'm replacing a broken spring, this is one of the parts required to get the job done right. A perfect replacement for our trailer. Thanks 505158



- 166079
by:

Just as advertised, great product 499320


Comments

The products work great , good quality stuff I dont foresee any problems ever with the parts

Bob - 04/23/2019

54321

- 166079
by:

Very fast shipping. Package got alittle damage with shipping but everything was there in great shape. 482898



- 166079
by:

Good product has worked great on my dump trailer, fast shipping 475086



- 166079
by:

Replaced rusty springs on a 14' skiff trailer. Fit perfect, DIY for cheap in the driveway, it would've been easier with an impact wrench. Take their advice, etrailer is the best for a reason, get ALL NEW HARDWARE TOO!! I broke several fasteners removing them, if the springs are bad, so is the hardware. I have done three hitches and a set of leaf springs now with these folks. Their install videos and expert advice made it a breeze to save probably a couple thousand in labor at a shop. 458401



- 166079
by:

Exact fit. Thanks etrailer.com 457161



- 166079
by:

Good quality springs and bolts, revived the suspension on the trailer. Quck turn around and delivery. 452081



- 166079
by:

Good looking solid nut and bolt. At turned out I ordered the wrong bolt and it was too long for my bracket and spring but I fixed it by adding some washers so it worked fine. The nut is self locking and the head has to be hammered into the bracket which prevents it from falling out even if the nut could come loose, (which it cannot). I should have paid more attention to the length. The description lead me to believe the longer one was correct, my bad. 448403



- 166079
by:

Worked as advertised. 447924



- 166079
by:

Fit was perfect....all is good... 445068


Comments

All went good and boat trailer is working great in Alaska...Thanks

Larry L - 10/24/2018

45011

- 166079
by:

WOW !!! I ordered these parts on the 16th they arrived at my house on the 20th !!! Easy to find what I needed. Had exactly what I wanted. Easy to order. A great price ! Very Very Professional . Highly recommend and you will always be my first choice ! 444455


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Ask the Experts about this Redline Trailer Leaf Spring Suspension

Do you have a question about this Trailer Leaf Spring Suspension?


  • Bushings, Shackle Straps, and Wet Bolts for Tandem Axle Trailer
  • The bronze bushings with 9/16 inner diameter come as a single, # D014-077-00, or in a pack of four, # K71-291-00. The closest shackle strap we have to that length is 3-1/8 inches. I've linked our selection for you. We do carry a heavy-duty strap that's 3-3/4 inches long, part # 018-026-05. We have wet bolts that are 3 inch, # 126B2, but the 3-1/2 inch long bolt that will fit the 9/16 inch bushing is not a wet bolt, # 166079. All of the prices can be seen on the linked product pages.
    view full answer...

  • Bolts Needed To Install Slipper Springs
  • For the spring eye you would use the Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long # 166079, but slipper springs don't have the second spring eye, so a bolt is not used on the back end. You can also use a wet bolt like # 126B2, for less friction. The Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # 166081 are for use with the spring and shackle straps used with a shackle straps on a tandem setup with an equalizer but it could be used for the springs and the...
    view full answer...

  • Replacement Suspension Components for 6,000 Lb Axles with 25-1/4 Inch Long Leaf Springs
  • Thanks for the photo! I have everything you need to get your trailer back on the road. I have attached my recommendations on the following parts for you trailer as well as the quantities needed. Leaf Springs: part # SP-111275 (4) Equalizers: part # TREQ310 (2) Shackle Straps: part # 115208GALV (8) U-Bolts: part # APUBR-8 (2) Eye Bolts: part # 166079 (12) I have also attached a few review videos on the above products for you as well.
    view full answer...

  • Shackle Bolt With Nut For 3 Inch, 3-1/2 Inch, And 3-5/8 Inch Length
  • Shackle Bolt with Locknut for Double-Eye Springs - 3" Long, # 166081 and Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long # 166079 both come with a nut. The Step Wet Bolt for 1-3/4" Double Eye Springs # 34007-187-00 does not come with the nut, however we have confirmed a fit with nut # 192600
    view full answer...

  • Axle Spacing When Using Slipper Spring Equalizer Kit # APT6SE with 26 inch Long Leaf Springs
  • Based on your leaf spring length the axle spacing you'd have with the hanger kit part # APT6SE would be right at 33 inches. This kit is designed for use with 9/16 inch bolts like the # 166079 and we would not recommend drilling out the kit to fit a wider bolt.
    view full answer...

  • Correct Bushing and Bolt for 4-Leaf Slipper Spring # SP-264275
  • The 4-Leaf Slipper Spring # SP-264275 that you referenced actually comes included with the nylon bushing but if a replacement is needed then the 9/16 inch # TRBU11561 that you mentioned would be the correct size and will work perfectly. The correct bolt for this setup is the Redline Spring-Eye Bolt # 166079 that features a 9/16 inch diameter and 3-1/2 inch length.
    view full answer...

  • Bolt Recommendations for a Equalizer for 2 inch Slipper Springs
  • For the Equalizer for 2 inch Wide Slipper Springs # TREQ1344 you will want to use a Wet Equalizer Bolt with Castle Nut and Grease Zerk # TRFA71063 for the center bolt hole. This bolt has a grease (zerk) fitting. For the side bolt hole that the spring will mount to you will want to use a Spring-Eye Bolt with Locknut # 166079. For a keeper bolt you would want a Leaf Spring Center Tie Bolt with Nut # 38-4TB. I attached an FAQ article on slipper spring suspension setups for you to...
    view full answer...

  • Comparing Lippert Never-Fail Bushings to the Bronze Bushings and Wet Bolt Option for Tandem Axles
  • The bronze bushings and wet bolts are a great option but they still do require maintenance especially under the conditions you referenced. There really isn't any new information in comparing it is basically the difference between maintenance required and zero maintenance. The Never-Fail bushings # LC279685 are maintenance free and self-lubricating so they will be a better fit for you. This kit comes with the bushings for 4 springs and two equalizers for a complete tandem axle trailer....
    view full answer...

  • Are there Bolt-On Hangers for Trailer Leaf Spring Suspension
  • We do have a couple of bolt-on spring hangers # CE14017G and # CE14016G but they are designed for slipper springs and not double-eye springs like # SP-124275. Its not likely that professional welder would charge that much. You might be able to find one locally via an iron workers union near you. For u-bolts for your 1-1/2 inch square axle you can use # SP01-120 for 2 u-bolts and 4 nuts. For a u-bolt plate you can use # 115983. For a hanger kit you could use # APS1. Now what you could...
    view full answer...

  • Where is the Length of the Bolt part # 166079 Measured
  • The 3-1/2 inch length of the bolt part # 166079 is measure from below the head of the bolt to the end of it. Based on what you mentioned this should work well for you.
    view full answer...

  • 12 Inch Slipper Spring Equalizer Kit Recommendation
  • The only 12 inch slipper spring equalizer we offer is the part # E4541-Z. For shackle bolts you would need the part # 166079, for equalizer bolts you would need # TRFA71063, cotter pin part # 165649, and for spring keeper bolts part # 7-7. We do not have all of this in a kit though.
    view full answer...

  • Bushings for Slipper Spring with 1/2-Inch Inner Diameter
  • The nylon bushing is included with Slipper Spring # SP-178275. The bushing has an inside diameter intended for a 9/16-inch bolt like # 166079. I linked a page showing all suspension bolts in this diameter. For a bushing with a 1/2-inch inner diameter and the 11/16-inch outer diameter required for this spring you can use # TRBU11506.
    view full answer...

  • Recommended 30 Inch Slipper Springs and 2 Inch Square Axle Mounting Kit
  • For your 2,000 lb square axle, I recommend the 3-Leaf Slipper Spring w/ Flat End for 2,900-lb Trailer Axles - 30" Long # SP-039275 which is a little stronger than your axle but won't increase your capacity of 2,000 lbs. This is a 30 inch long slipper spring with a 1.75 inch width as you stated. I recommend using the Spring-Eye Bolt with Locknut for Slipper Springs - 3-1/2" Long # 166079 with each spring. For your square axle mounting, I recommend the CE Smith U-Bolt Kit for Mounting...
    view full answer...

  • Single Slipper Spring for Tandem 6000 Pound Axles 2 Inches Wide
  • To determine the appropriate replacement slipper spring you would need there are a few measurements that are crucial. In order to get these measurements the current spring cannot have a load on it. If you have already removed the slipper spring from the trailer that works great. Or you can measure while it is on the trailer, just make sure that when you jack the trailer up you do so by the trailer frame. Also, make sure it is safe and secure before taking your measurements. The...
    view full answer...

  • Correct Track Alignment Replacement Hanger Bolt Recommendation
  • What you'd want is the replacement suspension bolt part # 166079. This is 9/16 inch in diameter like you need and is 3-1/2 inches long too. It comes with matching nut as well.
    view full answer...

  • 2 Inch Wide Replacement Equalizer for Slipper Springs on Seven Thousand Pound Triple Axle Trailer
  • The TruRyde # TREQ1344 Equalizer for 2 inch wide Slipper Springs that you referenced is considered a fit for the dimensions that you listed on your triple axle trailer with seven thousand pound axles. I would recommend replacing the entire equalizer instead of welding in new bushings. You indeed would need 4 equalizers for your triple axle trailer. The total length (a) and the length from the center of the front bolt hole to the center of the middle bolt hole (b) is slightly off when...
    view full answer...

  • Replacement Slipper Spring for Boat Trailer 1000-lb Axle
  • Well-worn leaf springs can become elongated and actually measure longer than their length when new. It is not uncommon for a leaf spring to get as much as 3/4-inch to 1-inch longer from years of use. If your spring measures 25-1/4-inches long then chances are that when new it was indeed the 24-5/8-inch length of the Redline # SP-177275. This 2-leaf spring is rated for 1000-lb trailer axles; you can check the sticker on your axle to confirm it's weight rating. This spring does indeed...
    view full answer...

  • 9/16 inch Diameter Shackle Bolt Longer than 3 inches Availability
  • We have the # 166079 which is a 9/16 inch diameter shackle bolt like you need that measures 3-1/2 inches in length.
    view full answer...

  • Hanger Bolt Recommendation for a 3-Leaf Slipper Spring # WIE3
  • You need to use a 9/16 inch bolt for the front eye of the 3-Leaf Slipper Spring that your referenced part # SP-178275. For that I would recommend the Spring Eye Bolt with Lock Nut part # 166079. The correct rear hanger is part # 115706S if it's a single axle trailer. Since the spring does not have an eye on the back of it you do not need to match a 9/16 inch bolt to anything.
    view full answer...

  • Recommended Shackle Bolt For Escort Trailer
  • The shackle bolt we offer that measures 3-1/2 inches is part # 166079. This is a 9/16 inch diameter bolt and includes the locknut. We do not offer a shackle bolt that measures 9/16 inch x 4 inches.
    view full answer...

  • How to Determine the Correct Slipper Spring for 6,000 lb Axle
  • The slipper spring we carry for 6,000 lb axles is the 5-Leaf Slipper Spring w/ Hook End # SP-160275. To figure out if this spring is going to work for you there is a measurement you will need to take. If you look at the accompanying diagram you can see that "C" is 27 inches. This is the length from the center of the eye to the end of the spring with the slipper; you can measure your current slipper spring to see if you have a similar measurement, keeping in mind that the current spring...
    view full answer...


Do you have a question about this Trailer Leaf Spring Suspension?




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Info for this part was:

Installed by:
Jeff D
Expert Research:
Jameson C
Video by:
Kathleen M
Photos by:
Sam P
Installed by:
Randy B
Photos by:
Sarah H
Updated by:
Sarah W

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