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

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

Part Number: 166081
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166081 - 3 Inch Long ABS Fasteners Suspension Bolts
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9/16" Diameter spring-retainer bolt is used to mount double-eye spring inside front or rear hanger. Includes locknut. Great Prices for the best trailer suspension parts from ABS Fasteners. Shackle Bolt with Locknut for Double-Eye Springs - 3" Long part number 166081 can be ordered online at or call 1-800-940-8924 for expert service.
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ABS Fasteners Trailer Suspension Parts - 166081

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

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


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


  • Diameter: 9/16"
  • Length: 3"

166081 Shackle Bolt with Nut

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (788 Customer Reviews)

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


When I ordered my kit from etrailer to replace the double-eye leaf springs on my 1970 Shasta Trailer, I decided to save a few bucks and get the bolts at my local hardware store. Big mistake! You wouldn't think a simple 3 inch bolt would be hard to find in your local hardware store. But in fact, i checked five hardware stores and none of them had this particular bolt. What a waste of time! I should have learned my lesson by now, and just give all my parts business to I have probably spent more than $1000 in the past several months refurbishing our 1970 Shasta. Totally satisfied with the selection at etrailer, and the service is second to none!


Your shipping time went wrong, but Kelsey’s way of handling
My order with problems, made my respect level go up.
Also, on your website, you have a picture of equalizers that look American made, with your name on it. What I received was stamped China and looks cheap…..


These are the exact bolts used by the manufacturer of my trailer. I had a spring break after 10yrs use, so am replacing the springs and all the bolts at the same time, thank you to etrailer for the springs (ordered earlier) and now the bolts/nuts, all arrived quickly and accurately, you are my first choice for all trailer parts for my 7 trailers, thank you and keep up the good work!


The bolts look good as well as the leaf spring. I realized I needed to order some h brackets to hold everything together so I'll have to order more. Good service thank you


I needed it quickly because on stripped on my trailer and we were getting ready to leave the state in our Wold Pup.

I paid for the extra shipping and they got out and to me in 2 days. Thank you.


We have had nothing but wonderful experiences with the Products from etailer. They have always been very professional and courteous on the phone and very knowledgeable. As a business owner myself, I would highly recommend etrailer.


Melissa T Provided excellent customer service. I Would recommend to everyone use etrailer.


I payed to have items delivered on Friday and they weren't delivered until Monday, I was told that extra charge would be reimbursed to my cc, waiting to see if that happens. All products were excellent though. Will do business with again.


Appears to be what the website states but I received several wrong items in my order so I have no idea.

Etrailer Expert

Jenny N.


I will be in contact with you to have the correct parts shipped out. Please keep an eye out for an email.


Had a leaf spring break on my off-road trailer in Mexico. Left it at a boat yard until I received the parts from trailer & returned to replace. Only took 2 hrs to replace both leafsprinhs, shackles, bolts etc. And we were back on the road.


The package was poorly shipped and the package came to me split open losing the nuts for bolts. these are special nuts and i can't just go to hardware store to buy some. When I called for replacement nuts they seemed to want to do things right. and said they would be expedited to me
Got a message the next day saying it is going to take 6 days to receive. That does sound like expedited to me. If it was packaged better I would have finished my project, now it is on delay .


I think etrailer is Great. I think their customer service is fantastic. My wife and I were in Arkansas, 1200 miles from our home in Ft. Myers Florida. I replaced the original springs on our trailer with new heavy duty springs, but never changed the hangers or bolts. Our trailer was riding very poorly, we needed new hangers and bolts badly because we were headed on a very long 9000-mile trip with many stops all the way to the Monterey CA. etrailer found us a UPS Store along our route to send us the parts that we needed. Many thanks to etrailer for great parts and Fantastic customer service and for helping us with our most Wonderful Adventure!


It worked great for my trailer.


We have had great experience with eTrailer, These parts came in as described.


I bought springs, shackle bolts, and u-bolts and plates. Everything was great and fit perfectly. Only issue were the u bolts which were not galvanized. However, at a local trailer store, I bought galvanized U bolts for $4.50 each.
For the DYIers, taking the old ones off took more than 4 hours for each side. My existing shackle bolts were so heavily rusted that I had to cut three off with a hack saw. Difficulty was confined space to operate hack saw with boat still on trailer. However, reassembling the new springs was less than 45 minutes each side.
Must have tools are large diameter 3/4-13/16-7/8 deep sockets (6 point), 2 2 foot long breaker bars and a can of PB blaster.
For safety: Good quality jack stands, minimum of 3--don't rely on the front trailer jack as it may roll.
By the way, I did these myself and I am 64 years old.


Other than the parts taking a month to process, once they were gathered and packaged, they were delivered within 2 days! I replaced both sides with new 3-leaf double eye springs, 4 shackle straps, 6 shackle bolts, 2 Dexter U-bolt plates, and 2 U-bolts. They were really easy to replace and I did it quickly. Looks great, gonna take her out soon.


I purchased the 3000# axle springs and all mounting hardware to replace the old ones on my 1963 travel trailer. My trailer no longer leans to the left and goes down the road better than new. I should have done it many year ago. I received my package on time and installation was easy and fit perfect. Thanks Bridget


Fit perfectly.


I bought a used Jon Boat trailer and first time out the shackle bolt gave out. Perfect fit for my application and I really like the way the nut was made so that it locked on the bolt. I used these with the Never Fail Bushings. I had to drill out the shackle to accommodate this beefy bolts but that wasnt a big deal. I ended up doing both sides that had standard bolts instead of wet bolts. Not sure why only 2 were regular 3/8 inch bolts.


I think you guys do a great job and deliver items on time and accurate.


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

Ron A.


The equilizers worked great I havent blown a tire yet thanks for all your help Ron


I am very pleased with the quality and obvious necessary strength of these shackle bolts and the locknuts. I do wish the free shipping incentive was "Orders Over $50" vs $99 as well as a quicker turnaround for delivery. I ended up having my local trailer guy providing the 3 shackle bolts I needed but I will use these to replace the other 3 eventually and have one to spare. Overall though, I am pleased with this order and appreciate having the selection of components I needed.



My trailer is still going strong and the last periodic maint check of my shackles, bolts, and nuts is A-OK.


I replaced my leaf springs and shackles on my trailer and these bolts fit perfect. They come with lock nuts and they definately won't be coming loose. If I had to do it again I would have bought an impact wrench to make the job go quicker.


Great product, great service, can't say enough good things about trailer...



Still going strong!!! I dont really beat on my stuff. I was given a trailer that had seen better days, I rebuilt most of the mechanicals on it & its still serving me well…Thanks for the follow up though…


worked perfect

Show More Reviews

See what our Experts say about this ABS Fasteners Trailer Suspension Parts

  • Replacement 7,000 lb Leaf Spring & Mounting Hardware
    The 7,000 lb double-eye leaf spring we have that is closest to 26" is the 24-7/8" long 6-Leaf Double-Eye Spring for 7,000-lb Trailer Axles # e64SR. Assuming yours have flattened a good amount (which will definitely be true if the trailer is older), these will work out as a good replacement. You mentioned hardware, and I'm assuming you were referring to U-bolts, shackle bolts and straps. You'll need to measure your shackle straps but you can use the following: - U-Bolt Kit # APUBR-9 -...
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  • Replacement For 25-1/2 Inch Leaf Springs on Boat Trailer
    Leaf springs flatten out over time, so since yours are 25-1/2" center to center, you'll want to go with ones a little shorter than that: - 3-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 25-1/4" Long - Dacromet # e93SR The # e93SR says for "4,000 lb" axles but that is just their capacity; you said you have 2-3/8" axles, which is a 3,500 lb axle, so this will give you a bit of added strength. You mentioned 3" shackle bolts as well, and for those use # 166081. Then for the U-bolts,...
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  • Can Trailer With 1-3/4 Inch, 2,000 lb Slipper Springs Change to Double Eye Springs
    Yes, you can change from 1-3/4 inch slipper springs to double eye springs on your trailer. You will need to have the slipper end hanger removed and have a new hanger welded on which allows the leaf spring to sit at the same height. Or you could replace all of your hangers with a brand new kit if you like, and I have added a link below to our entire selection of hangers and hanger kits for you. Then you just need the leaf spring and bolts, and for your 26-1/4 inch springs I recommend a...
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  • Replacement Nylon Bushings And Wet Bolts For Leaf Springs On A 2000 Pequea 1018 Deckover Trailer
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  • Could Shackle Bolt # 166081 be Used with CE Smith Suspension Hanger # CE14016G
    The 3 inch shackle bolt part # 166081 would be a great option to use with the CE Smith suspension hanger part # CE14016G. This would be a better fitting size than going with the longer 3.5 inch bolt you mentioned.
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  • Replacement Leaf Springs And Hardware On A 2013 Pace American White Out Snowmobile Trailer
    The 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles # e54SR sounds exactly like what you need for your 2013 Pace American White Out Snowmobile trailer. When choosing a replacement leaf spring, you'll want to focus on matching the new leaf springs capacity with the old leaf spring, and have it be slightly shorter (about 1/2-1 inch) because the old leaf springs will eventually flatten or stretch over time. For a U-bolt kit, we have the U-Bolt Kit for Mounting 3,500-lb, Round Trailer...
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  • 26 Inch 4-Leaf Springs For Bot Trailer & Replacement 13-104 Equalizer
    First, I do appreciate the specific info, and we can get you the leaf springs, equalizer and bolts. For the leaf springs, since they flatten out over time, sand yours are 26-1/4 inch now, go with 26 inch springs. You didn't mention the weight capacity you need but we have a pair of options: - 2,000 lb Axle: 4-Leaf Double-Eye Spring for 2,000-lb Trailer Axles - 26" Long # e77SR - 4,000 lb Axle: 4-Leaf Double-Eye Spring for 4,000-lb Trailer Axles - 26" Long # e22YR Then for the 13-104...
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  • Could Spring Eye-Bolt 166081 be Used with Leaf Spring SP-040275
    The spring eye-bolt part # 166081 is 1/2 inch shorter than the part # 166079 at 3 inches and would work well with the slipper spring part # SP-040275 that you referenced.
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  • Leaf Spring Options About 25 Inches in Length For 6,000 lb Axle
    You said "about" 25 inches in length so I'll give you a couple options for what might work depending on the exact length you have, and if you want to go to a higher-rated, 7k leaf spring. Also, you'll want your replacement springs to be a bit shorter because leaf springs stretch over time. If you happen to have leaf springs a bit longer than 25 inches (say 25-1/2 inches) you can use the 5-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 25-1/4" Long # e78SR. Those are dacromet coated...
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  • Parts Needed to Replace 2000 lb Axle and Suspension
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  • Replacement For 25-1/2 Inch Long, 5-Leaf Double-Eye Leaf Springs With 6,000 lb Rating
    Appreciate that info, and to since leaf springs elongate a bit over time with use, you'll want to go with springs slightly shorter than 25-1/2 inches. And for a 20,000 lb tandem axle dump truck, I recommend 6,000 lb rated springs. So for the springs as well as mounting bolts what you'll need are the following: - 5-Leaf Double-Eye Spring for 6,000-lb Trailer Axles - 25-1/4" Long # e34SR - Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # 166081
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  • Corrosion Resistant Shackle Bolt
    Because of its Zinc finish, the # TRFA73Z916DLNZ shackle bolt would definitely do a better job resisting corrosion than the # 166081 bolt with its raw steel finish.
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  • Does Lippert Tandem Axle Equa-Flex AP Kit Have Extra Wet Bolts
    There are not extra wet bolts with the Lippert Tandem Axle Equa-Flex AP Kit # LC64FR. Three are for hanging the leaf springs and equalizer one one side, and the other three will be for the other side. If your leaf springs don't attach to hangers with wet bolts you can replace the nylon bushings in the springs with Bronze Bushings # K71-291-00 and use the wet bolts that come with this kit, or you can not use those wet bolts and just use standard Shackle Bolt # 166081.
    view full answer...

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