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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: $4.48
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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 suspension parts 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 (444)
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TruRyde Trailer Suspension Parts - 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   (443 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


Delivered on time, excellent customer phone support, worked as I expected.


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.


Good fit / worked well


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.


Good quality shackle bolts. Would buy a gain!


Great price and quality


Great product.


exactly what i needed


Parts looked good.


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


Perfect fit for the leaf spring install ation.


Worked for what I needed. No issues so far.


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.


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.



High quality. Fit perfectly.


Can't ask for anything else


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


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!

Show More Reviews

See what our Experts say about this TruRyde Trailer Suspension Parts

  • Cushioned Equalizer with Bolts and Shackle Straps for 2018 Diamond Cargo Enclosed Trailer
    For the Equa-Flex Cushioned Equalizers # LC279688, the manufacturer lists the Lippert Components Tandem Axle Equa-Flex AP Kit - Wet Bolts - 3-1/8" Long Shackles # LC64FR as a related kit and that would be my recommendation. This is a great option, but you can alternatively use regular bolts like # TRFA73Z916DLNZ or wet bolts # 126B2 which will work better than the regular bolts. Then use regular shackle straps # TRSL313.
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  • 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.
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  • Recommended Trailer Leaf Spring Mounts
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    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...
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  • 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.
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  • 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.
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  • 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.
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  • 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.
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  • Heavy Duty Suspension Kit for 3-1/4 Inch Shackle Straps
    Having a 1 inch difference in the length of the shackle straps would be a pretty drastic change to the amount of articulation you get out of your suspension, so going with that kit wouldn't be advisable. We don't have a kit that uses longer heavy duty shackles, so you'd need to assemble the parts separately. • You'd need two of part # K71-358-00 • Two # TREQ104 equalizers • Two of # TRFA73Z916DLNZ shoulder bolts with nuts This will provide you the same kit, but with longer shackle straps....
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  • What Should the Bolt Diameter be on the Center Hanger to Use with the Curved Equalizer # TREQE34
    If by "perch" you mean center hanger, then you would want the center hole to have a 3/4" diameter like what you find on the hanger part # 115919. This will allow you to use the Shackle Bolt # TRFA73Z916DLNZ or Wet Equalizer Bolt # 126A1 with the Curved Equalizer # TREQE34 and keep the movement at a minimum.
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  • Replacement Leaf Springs for 3500 Pound Axle
    For a double-eye leaf spring supporting at least a 3500 pound axle, the closest leaf springs I have to what you have requested is the, # e59SR spring, 23-1/8" - 3500 pound, # e54SR spring, 25-1/8", 3500 pound, Dexter # 072-017-00 spring, 21" - 2000 pound. One option may be to cut the hangars from the current location and move them to fit an available spring size. If that is the case, you could use the Leaf Spring # e59SR spring measuring 23-1/8" eye center to eye center. (A longer...
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    The # SP-210275 you were looking at is for a 3500lb axle and is 27" long measured from center of spring eye to center of spring eye. This is the correct spring for your trailer based on the measurements you provided. The next shortest spring would be 2" shorter which would be much too short. For replacement equalizers we have the # TREQR89 which is 8" long and has a center hole of 9/16", or the # TREQR83 which is 9" long and has a 3/4" center hole. For replacement hardware you can use...
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    The 6-Leaf Double-Eye Spring for 6,000-lb Trailer Axles # e94SR that you referenced will work great on your trailer as it matches the capacity you need. The overall thickness of the spring pack is 2-1/4 inches which might be thicker than what you current have and could affect the height of the trailer. For a U-bolt kit you would need the part # APUBR-8 which is for the 6k axles like you have. The equalizers you have now are Equa Flex Cushioned equalizers so for a replacement set you'd...
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  • Installation Bolts for Equa-Flex Cushioned Equalizers
    You will need at least 10 bolts for the Equa-Flex Cushioned Equalizers # LC279687, and those bolts are the Zinc Shackle Bolt with Locknut for Double-Eye Springs # TRFA73Z916DLNZ. The reason I say "at least" 10 is because you would need additional bolts if you wanted to replace the bolts that attach your leaf springs to your hangers. What I recommend is getting all of the necessary bolts, shackle straps and nuts with one kit that is designed to work with the Equa-Flex, the Lippert Components...
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  • Recommended Shackle Bolt for 2,000 lb Utility Trailer Leaf Spring Suspension System
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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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  • U-Bolt Kit For Double-Eye Leaf Spring e48SR
    Here is what you need for a rust-resistant U-bolt kit and shackle bolts to go with the 4-Leaf Double-Eye Spring # e48SR: - CE Smith U-Bolt Kit for Mounting 3,500-lb, Round Trailer Axles - 5-1/2" Long U-Bolts - Zinc # CE23002 - Zinc Shackle Bolt with Locknut for Double-Eye Springs - 3" Long # TRFA73Z916DLNZ
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