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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: $4.97
Trailer Leaf Spring Suspension
Shipping Weight: 0.32 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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  • Reviews (427)
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  • Videos (1)
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TruRyde Trailer Leaf Spring Suspension - TRFA73Z916DLNZ

  • Suspension Bolts
  • Boat Trailer
  • Snowmobile Trailer
  • 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 Review of TruRyde Trailer Leaf Spring Suspension - Suspension Bolt and Locknut - TRFA73Z916DLNZ

Hello everybody, this is Jeff at Today we're gonna take a look at the three inch long, 9/16 diameter Zinc Shackle Bolt with the locknut for your trailer leaf springs. Now, this 9/16 diameter shackle bolt is used to mount your leaf spring to your trailer's front or rear suspension hanger, and this part will include the locknut that secures the bolt to the hanger. Both these parts are a corrosion resistant zinc finish. This is for a quantity of one bolt and one locknut. Now, few dimensions, we'll start with the bolt itself, we mentioned the diameter on this, it's gonna be right at 9/16 of an inch.

The bolt head size or the socket size you would use on this, it's gonna be 13/16 of an inch. Now, the length under the bolt head to the very end of the bolt is gonna be right at three inches, the usable length, which would be from under the bolt head to where the thread starts, is 2 3/8 inches, and just the thread length is about 5/8 of an inch. Now, the thread size on this is 9/16 by 18 threads per inch, and the lock nut, which will install right on here, when you go to install it, that's gonna have a diameter or head size of 7/8 of an inch. But that should do it for the review on this three inch long, 9/16 diameter Zinc Shackle Bolt with the locknut for your trailer leaf springs.

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   (427 Customer Reviews)

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


Parts are a 5, delivery options questionable.Can't delivery 10 pounds of metal in a paper mailer. Was tore open on the bottom. I run a mailing business and I can tell you its not that much more expensive to use a box.


New bolts made replacement of springs e asy


Good quality shackle bolts. Would buy a gain!


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.


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



Haven’t had any issues, they are on a small utility trailer. They work fine.


Great product.


Just what I needed! Thanks for the great customer service and the expedient shipping.


Worked for what I needed. No issues so far.


Perfect fit for the leaf spring install ation.


Perfect fit, self locking good quality.


Good price and they fit perfectly.


Great bolts, fit as expected. After one year, they are holding up great.


Quick delivery and exactly what i ordered. Thank you.


Good setvice. Just what I ordered.


They seem good. These and shackles need to be checked every season or two.


High quality. Fit perfectly.


Can't ask for anything else


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.



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.


We appreciate your great service!


Serrations did not get a good bite into bracket.


The non threaded (solid) part was slightly longer than my original bolt. Bolt length is correct.
But I was able to make it work.


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.


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


It’s a bolt and fit properly

Show More Reviews

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

  • Replacement Suspension Bolts For A 3,500lb Axle
    Hey Corey, Bolt grades for leaf spring suspensions can range from grade 5 to grade 8, with the consensus being that grade 8 is the most preferred. For a 3,500lb axle the Zinc Shackle Bolt with Locknut # TRFA73Z916DLNZ would be a compatible replacement. When removing the old bolt and installing the new bolt I recommend using a second wrench to make sure the head of the bolt doesn't spin as these have splines to help grip the bolt hole.
    view full answer...
  • 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...
  • 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...
  • 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...
  • 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...
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  • 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...
  • 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
  • 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...
  • 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...
  • 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...
  • Shackle Bolt Recommendation to Use with Leaf Spring e68SR on Boat Trailer
    The shackle bolt to use with spring # e68SR that you ordered is the part # TRFA73Z916DLNZ which is the correct size for this leaf spring.
    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...
  • 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...
  • Switching From Wet Bolts to Standard Shackle Bolts
    I'm not really sure why you would want to switch from wet bolts to standard shackle bolts as they will prolong the life of the bushing but we do have what you need, the Zinc Shackle Bolt with Locknut part # TRFA73Z916DLNZ which is 9/16" diameter x 3" wide. If you are switching to standard shackle bolts, I recommend bronze bushings like the Dexter Bronze Bushings part # K71-291-00.
    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...
  • 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...
  • 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...
  • 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...

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Info for this part was:

Employee Mike L
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Mike L
Employee Michael H
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Employee Jameson C
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Jameson C
Employee Jeffrey L
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Employee Lindsey S
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Employee Jeff D
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