1. Trailer Leaf Spring Suspension
  2. Redline
  3. Suspension Bolts
  4. Spring Mounting Hardware
  5. 3 Inch Long
  6. 9/16 Inch Diameter
Shackle Bolt with Locknut for Double-Eye Springs - 3" Long

Shackle Bolt with Locknut for Double-Eye Springs - 3" Long

Item # 166081
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Our Price: $5.62
Trailer Leaf Spring Suspension
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Redline Spring Mounting Hardware - 166081
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9/16" Diameter spring-retainer bolt is used to mount double-eye spring inside front or rear hanger. Includes locknut. Lowest Prices for the best trailer leaf spring suspension from Redline. Shackle Bolt with Locknut for Double-Eye Springs - 3" Long part number 166081 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
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Redline Trailer Leaf Spring Suspension - 166081

  • Suspension Bolts
  • Spring Mounting Hardware
  • 3 Inch Long
  • 9/16 Inch Diameter
  • Redline

9/16" Diameter spring-retainer bolt is used to mount double-eye spring inside front or rear hanger. Includes locknut.


Features:

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


Specs:

  • Diameter: 9/16"
  • Length: 3"


166081 Shackle Bolt with Nut





Video of Shackle Bolt with Locknut for Double-Eye Springs - 3" Long

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




Video Transcript for Redline Trailer Suspension 166081 Review

Today we're going to take a look at the 3-inch-long shackle bolt with the lock nut for double-eyed springs. This bolt will secure leaf springs to your front or rear hangar of your trailer's suspension system. Does include this lock nut to secure the bolt into place. Now the bolt itself is a grade-5 bolt. The overall length on this bolt if we measure it from the bottom of the head to the very end and see is going to be right at 3 inches. The bolt size is a 9/16th diameter by 18 threads per inch. The bolt head size is 13/16ths of an inch.

I got example here's a socket. You can see it will fit the head perfectly and then the lock nut which goes on the end right, the size on that is 7/8ths of an inch. You can see it fit rights into a 7/8ths inch socket but that should do it for the review on the 3-inch-long shackle bolt with the lock nut for the double-eyed springs.


Customer Reviews

Shackle Bolt with Locknut for Double-Eye Springs - 3" Long - 166081

Average Customer Rating:  4.9 out of 5 stars   (346 Customer Reviews)

9/16" Diameter spring-retainer bolt is used to mount double-eye spring inside front or rear hanger. Includes locknut.

- 166081
by:

I fixed my 5 wheel today with all the parts I got from you changed,all the equlizers and the shackles on both sides,my fifth wheel camper was blowing tires left and right.the shackles were almost wore all the way through the the end of the shackle.the tires were out of line with a straight line by two inches,when I got the new parts on the tires were right in line.thanks for the great prices and your web sight was easy to use and fast shipping I will be ordering from you again.thanks ron 213398


Comments
The equilizers worked great I havent blown a tire yet thanks for all your help Ron
Ron A - 07/20/2016

19533

- 166081
by:

Awesome.. Simple to find what I needed, quick delivery and parts ordered were a perfect fit for what I needed. Will use every time! Thanks etrailer.com 513967



- 166081
by:

Well, I just got the parts, so can't say anything reliable on chinese made parts. The price was(is) Great! a boat load cheaper then the local store....humm. springs fit perfectly, however, the springs I wanted are no longer being offered, could of had springs made but I went with the less$isMore theory. (more in my pocket) The "white" nylon bushings I ordered would not fit into the equalizers, but the grey colored ones I had did fit perfectly, just a-hair difference in outer diameter. The bolts fit perfectly as well. It is always 10 times easier dealing with eTrailer then the local store, So I know eTrailer has put a lot of time into making it easy for their customers, Thanks! Very Fast shipping, all at a price I can afford! 355949



- 166081
by:

The bolt does what it should. Arrived qickly and does its job. My sales rep, Lazer, was super helpful and made the transaction easy. Thanx!! 899735



- 166081
by: 10/08/2020

good material. 898762



- 166081
by:

Excellent product and easy installation 894605



- 166081
by:

893860



- 166081
by:

shackle bolt and nut were better quality than what was on my trailer, very happy. 892063



- 166081
by: 09/23/2020

fit perfect 887359



- 166081
by:

Good quality hardware. Especially impressed with the locknut. 883265



- 166081
by: 09/14/2020

Worked as described. 880689



- 166081
by:

Just what I needed to complete the job 876085



- 166081
by:

Exactly what I ordered 874727



- 166081
by:

Exactly what I needed and fit perfectly 872878



- 166081
by:

868977



- 166081
by:

The service was very good. I got just what I wanted and in a timely manner. Now days that's worth a lot. 865091



- 166081
by:

great 862299



- 166081
by:

Much better than I can find locally 861620



- 166081
by:

859239



- 166081
by: 08/08/2020

Quick, Easy, Competitive Pricing 858411



- 166081
by:

Perfect! Just what I needed. Thank you 858054



- 166081
by:

856924



- 166081
by:

Were shorter,but worked. 856359



- 166081
by:

Really glad I found your company. It makes finding hard to find parts much easier. 854043



- 166081
by:

The spring replacement went well and was easy to complete. It lifted my trailer about 1.5 inches from the top the tire to the fender. It wont rub anymore!! 859057


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Show More Reviews

Ask the Experts about this Redline Trailer Leaf Spring Suspension

  • Length of Redline # 166081 Suspension Shackle Bolt
    According to Redline, the # 166081 bolts are 3.1 inches long.
    view full answer...
  • Torque Specs for Redline Shackle Bolt with Locknut
    There actually is not a specific torque rating for shackle bolts like the Redline # 166081 that you referenced. You just want to make sure that the bolt is long enough so that when installed you have at least 2 threads protruding from the nut. This particular bolt measures 3 inches in length and the locknut is included. I have attached a short video demonstration that you can also check out.
    view full answer...
  • Torque Spec for 9/16" x 3" Long Bolt for Suspension
    There is not a specific torque requirement for bolts like the Shackle Bolt # 166081. You'll want to make sure that you're using a lock nut and ensure that the bolts you use are long enough so that when installed you will have at least 2 threads protruding that lock nut.
    view full answer...
  • Can Replacement Shackle Bolt Have Longer Thread Length
    I do understand your concern with the potential of a slightly longer thread length on the Shackle Bolt # 166081 causing the shackle strap to sit right on the threads. The fact is though that the shackle positioned there as opposed to the unthreaded shank is not going to cause much of a difference, if any. The shackle straps should not wear down any quicker because of this. As long as the bolt's overall length is correct then this will work perfectly for your trailer.
    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...
  • Availability of Wet Equalizer Bolts for a Joyrider Equalizer on a Prowler Trailer
    We do offer the wet shackle bolts you will need. The are the Wet Equalizer Bolt with Locknut and Grease Zerk, part # 126B2.
    view full answer...
  • Can Shackle Bolt with Locknut, # 166081 Be Used in Place of Dexter Bolts
    You will be able to use the Shackle Bolt with Locknut, # 166081, in place of the old Dexter bolts you have. If the bolts were shorter, you would not be able to use them but since they are basically the same length, you should not have any problems. I have included a link to a video on replacing shackle bolts that you may find helpful. We have numerous shackle links depending on what size you need. I have included a link to them for you to view along with a link to our FAQ articles on...
    view full answer...
  • Recommended Torque Specs for 9/16 and 1/2 Inch Trailer Suspension Hardware
    If you will be using 9/16 inch fasteners then torque them down to 110-114 foot pounds. If using 1/2 inch torque them to 76-78 foot pounds. You can find all sorts of different torque specs for the same size bolts or nuts and they will all be around these same figures. If you use Loctite use the blue kind, such as # LT37643, which will allow you to remove parts using hand tools. The red kind is going to be too strong. Also make sure the Loctite only goes on the threads and on any part...
    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...
  • Shackle Straps Break on a 20ft Tandem Axle Trailer and the Rear Axle Slides the Tires
    One of the most common causes for shackle straps to break is over-tightening of the shackle bolts. If the shackle bolts are too tight, the shackle straps are not able to move with the suspension. This causes binding and it can bend or even brake the shackle straps, bolts and hangers. The sliding that you are experiencing on the rear axle is common for tandem and triple axle trailers and it is usually called scrubbing. The rear axle scrubs because trailer axles are not steering axles,...
    view full answer...
  • Torque Specs for Axle Spindle Nut, Suspension Hanger Bolts, and Lug Nuts for Trailer
    It looks like you might be asking about a few different torque specs so I'll address all of them separately. For a trailer axle spindle nut like part # 165686 you will need to run the spindle nut down until there is no more side-to-side play in the hub and then back it off to the next notch so you can secure the cotter pin, like part # 165649, through the spindle. When it comes to hanger bolts like the Redline # 166081 there isn't a specific torque rating either as you just need to...
    view full answer...
  • Recommended Shackle Bolt for 2,000 lb Utility Trailer Leaf Spring Suspension System
    The Zinc Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # TRFA73Z916DLNZ is a grade 5 bolt. Your setup as described is a standard setup for leaf spring hangers and double eye leaf springs. The # 166081 is made by the same manufacturer and is used more commonly than zinc plated for most factory applications. The cost difference comes down to supply and demand. The Dexter bolt # 007-003-01 is simply a different manufacturer that has a big name in the trailer axle market. ...
    view full answer...
  • Comparing Bronze and Nylon Bushings for Trailer Suspension
    It really just depends on what you are looking to get out of the bushings. Bronze bushings, like part # K71-291-00, will last longer but are more noisy and it is recommended to use wet bolts like part # 126B2 to keep them lubricated. Nylon bushings, like part # SP05-060, are much quieter and can be used with regular bolts like part # 166081 since they don't need to be lubricated as much. As far as lifespan goes the bronze will last longer but not so much longer that they are much better...
    view full answer...
  • How to Pick Out Replacement Leaf Springs for 2007 Weekend Warrior Model CR3905
    I was able to find out that your 2007 Weekend Warrior model CR3905 is triple axle trailer with a GVWR of 16k. That means for each axle you'd need a capacity of at least 5,333 lbs. Which means you most likely have 6k axles. We have a few options for that capacity for leaf springs but you'll need to measure the length of your current springs to be sure. If you have 25-1/4 inch long springs you'd need part # SP111275. If you have 26 inch long springs you'd need part # SP-053275. If...
    view full answer...
  • Leaf Spring and U-Bolt Kit for Dexter 4,000 lb Axle
    Yes the leaf spring part # SP-051275 would be the correct spring for your 4,000 Dexter axle. This is a very standard length trailer leaf spring at 26 inches and will work well on your trailer. Then for a U-bolt kit part # APUBR-1 would be what you'd need and then for shackle bolts part # 166081.
    view full answer...
  • Can Suspension Wet Bolts Be Used with Both Nylon and Bronze Bushings
    You are correct that wet suspension bolts like # LC126238 are usually used along with bronze bushings for the longest possible service life but using them with nylon bushings is permissible. If standard bolts like # 166081 were to be replaced with wet bolts it would be fine to continue using the existing nylon bushings (for convenience) but in an all new installation bronze bushings would be preferred.
    view full answer...
  • Recommended Complete System Trailer Frame Down for Roadmaster Comfort Ride
    The Roadmaster Comfort Ride Leaf Spring Suspension Kit w/ Shocks - Tandem 8K, 3" Trailer Axles # RM-2460-2580 will fit any 3 inch diameter axles. The closest rated 3 inch diameter axles we have are the Dexter Trailer Axle w/ Electric Brakes - E-Z Lube - 8 on 6-1/2 Bolt Pattern - 95" - 7,000 lbs # 8327834-EB. This axle comes with the hubs and brake assemblies so as long a 80 inch on center spring seats work for your trailer, this will be an excellent choice. You will also need the...
    view full answer...
  • Replacement Leaf Springs for Single Axle Trailer with 26 Inch Long Old Leaf Springs
    Correct, the loaded and unloaded length for a leaf spring will be different. In order to choose the correct replacement you will need to remove all weight from one side of the trailer and then measure the eye to eye spacing of that leaf spring. The new leaf spring you choose should then be very close to this but it can also be a bit shorter as leaf springs will flatten out over time as they wear. The most likely replacement we have for you is part # SP-220275 which measures 25-1/4"...
    view full answer...
  • 3-Leaf Double-Eye Spring for 2,000-lb Trailer Axles Shackle Bolt Diameter
    The 3-Leaf Double-Eye Spring for 2,000-lb Trailer Axles - 20-3/8" Long part # SP-169275 takes a 9/16" diameter shackle bolt like part # 166081. The trailer's weight rating is determined by the two axle capacities so one axle would not need to be rated to support the whole load if it's a tandem axle trailer. The capacities would be split up. If your boat is gear, fuel, and trailer is around 3,200 lbs I recommend to go with the 2-2,000 lb axles and 1,000 lb leaf springs because if not your...
    view full answer...
  • Replacement Shackle Strap Recommendation that is 3-1/2 inches Long
    Your question came in blank, but based on the picture you submitted it looks like you are in need a replacement shackle strap that is 3-1/2 inches in length. For that you would want the Shackle Strap # TRSL225. This strap is 3-1/2 inches long like what you have pictured with the hole measurements 2-1/4 inches on center. For a new shackle bolt you would want the Shackle Bolt part # 166081.
    view full answer...
  • Is There A Suspension Kit Which Contains 8" Long Straight Equalizers
    The Straight Equalizer 8" Long part # TREQR89 isn't offer in a kit but we do still have all the other parts you need, shackle straps part # TRSL313 (8) and eye bolts part # 166081 (14). If you want a kit, we have upgrade options like part # K71-358-00 (2) or part # LC281285
    view full answer...
  • Double Eye Spring Recommendation and Suspension Parts for 6,000 Lb Trailer Axle
    The leaf spring I recommend is 6-Leaf Double-Eye Spring for 6,000-lb Trailer Axles part # SP-053275. These leaf springs come with 9/16" diameter nylon bushings installed. The amount of leafs do not matter as much as long as the spring is rated for your axle capacity. I recommend TruRyde Shackle Link part # TRSL225. The shackle straps are 2-1/4" long. The bolts you need are part # 166081. I also recommend curved equalizers part # TREQ356 that measure 6-1/8" long. We do not carry an equalizer...
    view full answer...
  • Replacement Trailer Suspension Shackles, Equalizers and Bolts
    We can help you with replacement trailer suspension parts for your Keystone Cougar. Our main page for suspension components is linked for you; on this you can select items like shackle straps, spring bushings, bolts and equalizers. Shackle strap # 115052 has a hole spacing of 2-5/8-inches, the closest to yours that we have. Overall dimensions are 4-inches x 1-1/4-inches and the bolt hole diameter is 9/16-inch. With this you can use standard bolt/nut # 166081 or wet bolt # 126B2 which...
    view full answer...
  • Replacement Bushings, Eye Bolts, and Shackle Straps for a 1-3/4 Inch Wide Leaf Spring
    The prices are a reflection of factors such as demand, availability, cost, and several other variables. The nylon bushings are also the least cost effective component of the kit. Unfortunately, we do not offer the Never Fail Tandem Axle Suspension Upgrade Hardware Kit for Double Eye Springs part # LC281285 with 1-3/4" long bushings. If you have 1-3/4" wide leaf springs then you will want to piece your own kit together with the Never Fail Bushings part # LC279685, Shackle Bolt with Locknut...
    view full answer...
  • Can I Replace 4 Leaf Springs With 5 Leaf Springs For The Axle On My Trailer
    Yes, you can replace your 4 Leaf Springs like part # SP-221275 with 5 Leaf Springs like part # SP-111275 as long as you replace all of the springs at the same time. There really isn't any advantage if you want to go with 5 leaf springs over 4 leaf springs. Typically, you always want to try to get the same parts to replace what you already have, but 1/8 of an inch difference per leaf spring won't make much of a difference in how everything fits together. The 5 leaf springs will work just...
    view full answer...
  • Recommended Leaf Spring Bushings and Shackle Bolt with Locknut
    I recommend using the Never Fail Bushings - 9/16" Inner Diameter, 11/16" Outer Diameter - 1-3/4" - Qty 14 # LC279685. For 1-3/4 inch springs you will want the Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # 166081. There is no specific torque rating for shackle bolts, you simply want to ensure they are long enough so you have at least 2 thread protruding from the bolt. You want to tighten the bolt until the knurls go through the shackle link or hanger and the bolt head is...
    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...
  • 3,500 lb Leaf Springs and Hanger Kit Recommendation for a Mobile Home Trailer
    Mobile home axles/suspension are typically designed for one time use, so picking out components to work with mobile home components can be tricky. Your best bet is to do what you did with your axles and just start over with quality stuff that you will know will work. First let's start with a spring. For a 3,500 lb spring the part # SP-212275 would be a great choice. For a u-bolt kit you would want part # APUBR-1. For a tandem axle hanger kit you would want the part # APT3. The Never...
    view full answer...
  • Replacement Parts to Rebuild Trailer Suspension on 1976 EZTrail
    All of the products you listed will work together just fine. Keep in mind, if your current springs are not 26 inch springs, like the # SP-124275 you referenced, your hangers, # APS4, will not be in the exact same position as your current ones. When repositioning everything the most important factor is keeping the axle in the same location it currently is. The U-Bolt Kit # APUBR-10 is correct for a 2,000 pound axle and the Shackle Bolt # 166081 will work too. It's hard to tell by the...
    view full answer...
  • Trailer Suspension Kit and 6 Inch Long Equalizers for Tandem Axles and Double Eye Springs
    Suspension kit # APT4 for tandem axles with double eye springs has 6-1/4 inch long equalizers so it is a possible option for you. Kit # AP233-H248 uses 5-3/4 inch long equalizers. But if you have to have equalizer # TREQ310 then the individual parts will have to be pieced together since there isn't a kit with that equalizer. If you go that route then you would also need: 8 of # 18-11GALV 14 of # 166081 1 of # H248 (or other hangers, see link)
    view full answer...

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Info for this part was:

Expert Research:
Mike L
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
John H
Video Edited:
Zack K
Video Edited:
Joshua S
Installed by:
Jeff D
Test Fit:
Nicholas E
Video by:
Alan C

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