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

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

Item # TRFA73Z916DLNZ
Our Price: $4.94
Trailer Leaf Spring Suspension
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Shipping Weight: 0.39 lbs
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9/16" Diameter spring-retainer bolt is used to mount double-eye spring in front or rear suspension hanger. Locknut included. Great Prices for the best trailer leaf spring suspension from TruRyde. Zinc Shackle Bolt with Locknut for Double-Eye Springs - 3" Long part number TRFA73Z916DLNZ can be ordered online at or call 1-800-940-8924 for expert service.
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TruRyde Trailer Leaf Spring Suspension - TRFA73Z916DLNZ

  • Boat Trailer
  • Snowmobile Trailer
  • Suspension Bolts
  • 3 Inch Long
  • 9/16 Inch Diameter
  • TruRyde

9/16" Diameter spring-retainer bolt is used to mount double-eye spring in front or rear suspension hanger. Locknut included.


  • Suspension bolt attaches leaf spring to front or rear hanger
  • Corrosion-resistant zinc finish
  • Included locknut secures bolt


  • Bolt diameter: 9/16"
  • Length under bolt head: 3"
  • Usable length: 2-3/8"
  • Thread length: 5/8"
  • Thread size: 9/16"-18 fine
  • Bolt head diameter: 13/16"
  • Quantity: 1 bolt and 1 nut

Dimensions on bolt

FA-7-3Z and FA-916DLNZ TruRyde Zinc Shackle Bolt and Lock Nut

Video of Zinc 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 TruRyde Trailer Suspension TRFA73Z916DLNZ Review

Today we're going to review part number TRFA73Z916DLNZ. This is the TruRyde zinc shackle bolt with the lock nut for double-eye springs. This shackle bolt is a 9/16" diameter, and it is used to mount your double-eye leaf springs in your front hanger or your rear-suspension hanger. The lock nut is included. The shackle bolt and nut is a corrosion-resistant zinc finish. It is a 9/16" diameter, I mentioned, and the length of it, this is for 3" long.

So basically the way you would measure that is if you measure from under the head of the bolt to the very end of the bolt. And you can see there that it's 3". One other little item we need to mention to you is, this is a lock nut. It may look like, just by looking at it, a standard nut that attaches to the bolt, but this is what is called a distorted lock nut. By the distorted they mean that if you look at this side of the lug nut, it is actually oval shaped.

If you look at the bottom, it's actually normal round shape. What they do is they crimp the very top of this, and you can tell that by if you look at the sides you'll see crimp marks right here, and then 180 degrees crimp marks on the other side. So they basically crimp this and squeeze it a little bit to distort the top of the bolt, and that will give it it's locking feature. So when this lock nut is installed onto your shackle bolt, what you want to make sure is that these crimp marks right here that are at the top are facing to the outside. So in other words, make sure the crimp marks are facing to the outside.

And you'll start it, and it will start about one thread. It won't start a whole lot. It will seem like the threads are cross threaded or something. but just go ahead and start that way. Actually, what you'll need to do is once you install your lead spring in your suspension, and then you're going to put the nut on there, just start it like that.

Make sure your suspension is all lined up, everything's ready to go before you tighten this down. Now once it's all ready to go, go ahead and tighten this down, and as you tighten this down, it will lock onto this bolt when it gets to this distorted part. So that is very critical. If you try to do it with the crimp marks facing inwards, it just won't start because it's distorted and the threads will not start. So a little tip there is to just make sure those crimp marks, that you can see right here, are facing out. It'll start maybe one thread, not a whole lot, and then you'll be ready to install the shackle bolt. Hope that helps you, and that should do it for review on part number TRFA73Z917DLNZ.

Customer Satisfaction Score:

Customer Reviews

Zinc Shackle Bolt with Locknut for Double-Eye Springs - 3" Long - TRFA73Z916DLNZ

Average Customer Rating:  4.8 out of 5 stars   (298 Customer Reviews)

9/16" Diameter spring-retainer bolt is used to mount double-eye spring in front or rear suspension hanger. Locknut included.


Ideally, the shoulder of the bolts should be long enough to extend all the way through the spring and shackle so that the threads are not subject to load or moving parts. The treads are the weakest portion of any bolt and should only be exposed to tension, not sheer loads. This being trailer hardware, I guess that design factor is not a high priority. Just seems like it could be done right with just a smidge more effort or consideration. That said, the original bolts I removed had only a slightly longer shoulder and one-half the shackle was riding on threads and it held up for years, although it was worn considerably more in the threads.


All good except one of the bolts was supplied with a nut that was too large, sourcing one locally with the proper thread was not possible, ended up purchasing a complete set of shackle bolts to get the job done. I did not make contact to have the issue resolved so I could complete the work but I am confident that the issue would have been resolved if I had asked for a replacement or refund


Bought these for a Big Tex 35SA 3500lb trailer. Arrived in 3 days and was a perfect fit, thank you.


I have not been able to use parts as UPS lost one entire shipment, damaged another shipment and etrailer left some parts out of the replacement shipment. I want to replace all the items on my trailer together in one day.

Anyways, your company has been good about fixing the issues.

I hope UPS pays for the damage and lost shipments.


Wth rusted out leaf springs on my trailer but with zero experience replacing them, I contacted etrailer and Shawn was very helpful in selecting the right parts and taking me through the process. She was patient in terms of helping me take the right measurements and suggesting the bolts and pieces I needed to do the job right.

Everything came well packaged and complete two days later. An hour after that the springs were in my trailer and now has a boat sitting on it.



What can I say they are bolts they are still bolted in!


Shackle bolts fit perfectly


Good quality delivered quick


First time I've purchased from etrailer. Will again if the need arises.


Seems to be really good. The part was back ordered and took an extra month to get here. But etrailer was up front with communication and tried to find a similar comparison.

I’ve got it now and happy.


Fast shipping and priced right.


Just as expected.


Great product at great prices!


Good product.


I never saw locknuts like the ones that came with the bolts. They are only slightly dented on the exterior/last thread of the nut. Looks home . Bottom line if the bolt is just big enough to fit the lock nut most likely will not fair well. I punched the bolt threads as a assurance.

After a year in use and 3,000 miles of high speed interstate and heavy load everything is GREAT.
Robert H - 10/21/2014


I am completely satisfied with service and the product that I purchased from The measurements and specifications on the web site were complete and accurate. Shipping was prompt and the parts were packed more carefully than anything that I have purchased online. Installation of my replacement leaf springs went seamlessly which I really appreciated as I had to leave my broken trailer at my hunt camp and had limited tools to do the repair.

I can't recommend highly enough. They are now my first choice in trailer parts.


These shackle bolts came with the lock nuts for less than other parts houses want for just the bolt.

Everything has worked great! Thanks for great parts, prices
Doug V - 08/18/2016


Great product and excellent customer se rvice.


Fit perfectly


The replacement trailer spring set was out of stock but Michelle watched for it with care and kept me informed. She let me know when it came in, shipped it quickly and made sure I had all the nuts and bolts needed to replace my broken springs. Have ordered from etrailer in the past and the quality and price can't be beat.


If you look closely, the bolt head is serrated; this area is thicker than the smooth diameter of the bolt, so you will have to hammer it into place. My trailer is older, so I had to take a round file to smooth out the eyeholes and then hammer in the bolt about a 1/4 inch so it sat flush. The plus is the serrations grab the eyehole of the steel so when you tighten the nut, the bolt won't spin.


After suffering a major incident on the highway where 3 of the 4 tires were destroyed along with the rims and some suspension parts, I needed parts fast and correct for my trailer. These wheels, along with the other suspension parts, where inexpensive, well built, accurately described, delivered quickly, and exactly what I needed to get my trailer back up and in operating condition again.


These parts were for a 1977 Citation Travel trailer frame that someone had cut the springs off because the electric brake drums were to tight to roll and quite rusty so adjustment was not practical in the field.The springs and assembly pieces arrived promptly. The installation was completed in one hour. All parts fit exactly as they should. The goal is to make a storage trailer unit 8 X 18 feet.


we plan on doing more business our trailer seem to be a hit see attached photo


I purchased these bolts and bushings to "tighten up" the suspension on a three rail Pacemaker motorcycle trailer I bought in 1974. Used a large welding clamp to press the bushings into the spring eyes, drilled the original shackle plates from a worn 1/2" hole to 9/16" and everything fit like new. Great service from etrailer.

Show More Reviews

See what our Experts say about this TruRyde Trailer Leaf Spring Suspension

  • Troubleshooting Trailer Suspension Bolts Splines that Aren't Seating
    Have you tried tapping the bolt in with a hammer? Hopefully not much force would be needed. Ideally you get the splines seated all the way but then you don't have to really torque the nuts down as the bolt needs to allow the suspension to move. You might open up the holes a bit more to allow the splines to fit through if they are being stubborn.
    view full answer...
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  • Gaps Between Shackle Bolt Heads and Shackles on Double-Eye Trailer Suspension
    For a 9/16 inch shackle bolt such as # TRFA73Z916DLNZ you will want 65 to 95 foot pounds of torque. Provided that you are within that range you won't over-torque the nuts. A little bit of play is expected but large gaps could be taken up using washers. The spring eye does need to be able to move though so it can't be sandwiched between the shackles too tightly.
    view full answer...
  • Is Lock Nut with Nylock Difficult to Thread Onto Bolt
    Nuts that have Nylock built into which is what prevents them from backing off over time. It's what makes them a "lock nut". The downside is they can be a bit difficult to thread on since it has to be super tight. You still might verify that the nuts is the correct size for the bolt and you aren't cross-threaded. If you remove the nut does the threads on the bolt looks damaged where the nut was? If so, it's not the right size or it's cross threaded.
    view full answer...
  • What Bolt Grade is the part # TRFA73Z916DLNZ
    The bolt part # TRFA73Z916DLNZ that you referenced is a Grade 5 bolt.
    view full answer...
  • Trailer Suspension U-Bolt and Shackle Bolt Torque Values
    The axle U-bolt torque spec will depend on the bolt diameter- • 5/16 inch- 65 ft/lbs • 1/2 inch- 45-70 ft/lbs • 9/16 inch- 65-90 ft/lbs • 5/8 inch-100-120 ft/lbs • 3/4 inch-160 ft/lbs Shackle bolts don't typically have a specific torque value. They're usually tightened until the knurled portion of the bolt pulls completely into the shackle strap and the bolt head is ran all the way down to the shackle strap and you have at least 2 threads extending past the face of the nut. I've linked...
    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...
  • 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.
    view full answer...
  • Are Other Parts Required When Replacing Trailer Equalizer With Equa-Flex Cushioned Equalizers
    I have attached a photo of the Equa-Flex Cushioned Equalizers, part # LC279688 you can check out. The dimensions are noted on the photo. As long as your axle is within the 6,000 to 8,000-lb capacity these will work for you. While you are changing out the equalizers you may want to consider new bolts and nuts. I recommend part # TRFA73Z916DLNZ. This is a Zinc shackle bolt with a locknut.
    view full answer...
    Image 1 for
  • Should Nuts and Bolts Be Replaced When Installing New Trailer Equalizers
    The bolts would have the same thread pitch as the nuts. The reason why you could only get the nut tightened a few threads is because the nuts that are used are lock nuts. It is recommended to use new hardware, nuts and bolts like the Zinc Shackle Bolt with Locknut, part # TRFA73Z916DLNZ, when replacing the equalizers. You would need to measure your old hardware to determine which replacement bolts you will need. I have linked all the suspension bolts we have available and a video of...
    view full answer...
  • Will Road Armor Shock Absorbing Equalizer Kit Help With Up and Down Movement Of Trailer
    It sounds like you have a lot of up and down movement in your travel trailer while going down the road. The Road Armor Shock Absorbing Kit part # LC696740 is a better option then the MORyde kit to help eliminate some of that movement because it provides about 3" more of suspension travel capability for a smoother ride. The cushioned Road Armor system will absorb the road shock to help eliminate the up and down movement you are experiencing. I have attached the dimensions of the equalizers...
    view full answer...
    Image 1 for Image 2 for
  • Will the Never Fail Bushings Work On a Grand Design Momentum
    The Never Fail Bushings part # LC279684 will work with pretty much any trailer with double eye leaf springs. The double eye leaf springs must also be 1-3/4" wide but this is pretty much standard for double-eye leaf spring so as long as you have double eye leaf springs then you should be just fine. Please note, it will be a good idea to replace the eye bolts when you are switching out the bushing so for this you can use part # TRFA73Z916DLNZ.
    view full answer...
  • Is There a Suspension Kit with 5-1/2" Long Straight Equalizers
    I do have an option for you though we don't really have all inclusive kits for this. The equalizer you need is the Straight Equalizer for 1-3/4" Double-Eye Springs part # TREQR2 which measures 5-1/2" long. Then for the shoulder bolts you can use the Zinc Shackle Bolt with Locknut for Double-Eye Springs part # TRFA73Z916DLNZ. I have attached our leaf spring and shackle strap selection below as well but I would need to know the length and capacity for the springs and the length for the shackles...
    view full answer...
  • Is Road Armor Equalizer Upgrade Better Than MORryde
    You will definitely want to go with the Road Armor Shock Absorbing Equalizer Kit # LC696740 over the MORryde as the Road Armor has more travel and will provide a smoother ride. Then, in regards to shackle straps I'm not sure what you mean by which would be more affected. You will want to go with shackle traps that are the same size if your current equalizer is the same dimensions as the Road Armor. As far as the leaf springs are concerned, they only need to be replaced if they are damaged...
    view full answer...
  • 9/16 inch Diameter Shackle/Spring Bolt Options for Boat Trailer
    9/16 inch diameter shackle and leaf spring bolts are the standard size for trailer suspension so that would be what you'd need for your boat trailer. The part # TRFA73Z916DLNZ that you referenced is this size like you will need and also is galvanized like you wanted which will help prevent corrosion. Another really great solution is the part # 126B2 which has a zerk fitting on the bolt head which allows you to easily grease the bolt and bushing to prevent corrosion as well.
    view full answer...
  • Recommended Trailer Leaf Spring Mounts
    You are on the right track here! I recommend welding them to the trailer this is the most common practice and will prove to be the most reliable. The 4-Leaf Double-Eye Spring for 3,500-lb Trailer Axles part # SP-212275 that you looked at are 1 3/4" wide with that said and looking at the photo I recommend going with the Front/Center/Rear Hanger for Double-Eye part # 115918 This has the width and bolt eye diameter you want. If you will need the bolt to connect the two together use the Zinc...
    view full answer...
  • Will Putting Axle In Backwards Cause Trailer Brakes To Not Function?
    The reason your brakes are no longer functioning, is that they are actually directional with the front and rear pads being different. Since the axle is backwards meaning the brakes are backwards the brakes will not function. To fix this you will need to remove the axle and turn it around. As long as the shackle bolts are not rusted, you will have no issues reusing them. If they have any damage though I would go ahead and replace them for peace of mind. If you need a replacement we have...
    view full answer...
  • Can I Re-Use My Wet Bolts without Grease in Them with the Never Fail Bushings
    Yes, technically if you already have something like the Wet Equalizer Bolt with Locknut and Grease Zerk for Double-Eye Springs - 3-5/16" Long # 126B2, and assuming you were able to get the grease out of the wet bolt and it was kept grease free, you could use them with the Never Fail Bushings. If you want to replace your old wet bolts with standard equalizer bolts, you can use the Zinc Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # TRFA73Z916DLNZ.
    view full answer...
  • Will Road Armor Equalizer Replace Equa Flex Equalizer # LC279687
    The Road Armor Shock Absorbing Equalizer Kit # LC696740 that you referenced is close enough dimensionally to the Equa-Flex equalizer # LC279687 that you have now so it will fit and work well. Bushing come with this already pre installed, for bolts you'd want the part # TRFA73Z916DLNZ but for shackles you'd need to let me know what length you have currently. I attached a link to a page that has all of the shackles we carry as well.
    view full answer...
    Image 1 for
  • Suspension Components For Tandem Axle Trailer
    We do have tandem axle suspension kits with equalizers, but the three items you mentioned are not available in one kit. You can order # TREQE34, part # 115208GALV , and # TRFA73Z916DLNZ separately. You will just need to change the quantity you need in the shopping cart when ordering.
    view full answer...
  • Never Fail Bushing Or Shock Installation On A Tandem Axle Trailer
    The correct Never Fail Bushings for your trailer are part # LC279684. The Never Fail Bushings are not compatible with wet bolts kits therefore, you will need to use the Zinc Shackle Bolt with Locknut for Double-Eye Springs part # TRFA73Z916DLNZ. Even with the Never Fail Bushings and Upgraded Equalizers, you will still see an improvement in your trailers handling and stability if you add shocks. The shocks will allow for a much greater distance of suspension travel and smoother ride. In...
    view full answer...
  • Do Suspension Bolts Need to be Replaced when Installing the Never Fail Bushings # LC279685
    Since you have a 2017 Forest River Wildwood 28 DBUD the bolts used in your suspension should not need to be replaced with the part # LC281285. Unless for some reason your bolts are damaged and need to be replaced you should be good to use just the Never Fail Bushings # LC279685. Please note that Never Fail Bushings are meant to be used with standard bolts like part # TRFA73Z916DLNZ as grease will destroy them. You can use the bushings with wet bolts but only if you clean them and make...
    view full answer...
  • Can I Use the Road Armor Equalizer on my 2018 Heartland Wilderness 2575RKS with 35" Axle Spacing
    Yes. You can use a Lippert Road Armor # LC696740 on your 35" spaced axles on your 2018 Heartand Wilderness 2575RKS. Depending on the dimensions of your existing equalizer, you may need longer shackle straps; typically this application requires using a 3-1/8 shackle link like the Shackle Strap - 3-1/8" Long # TRSL313 for axles that are 35" apart. If you want to replace the bolts in your system you can use the Zinc Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # TRFA73Z916DLNZ...
    view full answer...
  • Is Dexter Heavy Duty Suspension Upgrade Kit # K71-358-00 Zinc Coated
    The shackles of the Dexter Heavy Duty Suspension Upgrade Kit # K71-358-00 are zinc coated but the bolts are not. For zinc coated bolts as well you'd want the # TRFA73Z916DLNZ.
    view full answer...
  • 3-1/8 Inch Shackle Straps for Road Armor Equalizer
    You can use longer shackle straps, but there are no separate 3-1/8" x 1/2" thick shackle straps we offer for use with the Road Armor Shock Absorbing Equalizer Kit # LC696740. The shackle straps of that length we carry are 1/4" thick, the Shackle Strap - 3-1/8" Long # TRSL313. So for thicker shackle straps, you would have to source them elsewhere if available, but I don't foresee that thickness making any type of impact for you, and the Road Armor kit along with the 1/4" thick shackle...
    view full answer...

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