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  1. Boat Trailer Parts
  2. CE Smith
  3. U-Bolts
  4. 1/2 Inch Diameter
  5. 3-13/16 Inch Long
  6. Galvanized Steel
CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 4

CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 4

Item # CE15283GA-4
Our Price: $56.36
Boat Trailer Parts
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These sturdy square U-bolts let you secure 2 double U-bolt bolster brackets or 4 standard bolster or bunk board brackets to your boat trailer's frame. Galvanized steel is durable and corrosion resistant. Hardware included. 1-800-940-8924 to order CE Smith boat trailer parts part number CE15283GA-4 or order online at etrailer.com. Free expert support on all CE Smith products. Great prices and Fastest Shipping for CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 4. Boat Trailer Parts reviews from real customers.
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  • Reviews (123)
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CE Smith Boat Trailer Parts - CE15283GA-4

  • U-Bolts
  • 1/2 Inch Diameter
  • 3-13/16 Inch Long
  • Galvanized Steel
  • 3-1/16 Inch Wide
  • CE Smith

These sturdy square U-bolts let you secure 2 double U-bolt bolster brackets or 4 standard bolster or bunk board brackets to your boat trailer's frame. Galvanized steel is durable and corrosion resistant. Hardware included.


Features:

  • 4 Heavy-duty square U-bolts let you secure brackets on your boat trailer
    • Works with 2 double U-bolt bolster brackets or 4 standard bolster or bunk board brackets
    • Designed for use with brackets that have 1/2" diameter mounting holes or 1/2" wide mounting slots
  • Galvanized steel resists rust and corrosion
    • Suitable for saltwater exposure
  • Includes mounting hardware
  • Made in the USA


Specs:

  • Quantity: 4 U-bolts
  • Inner width: 3-1/16"
  • Length: 3-13/16"
  • Bolt size: 1/2"-13
  • Thread length: 1-1/2"
  • Overall length: 4-5/16"


dimensions

Galvanized Steel

Galvanized steel parts are hot-dipped in zinc after being stamped. This creates a coating that is typically 3 mil to 5 mil thick. This thick, all-around coating allows galvanized steel products to provide years of use without rusting or corroding.



15283GA C. E. Smith Galvanized Square U-Bolts for Boat Trailer Brackets - Quantity 4




California residents: click here


Customer Satisfaction Score:


Customer Reviews

CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 4 - CE15283GA-4

Average Customer Rating:  4.7 out of 5 stars   (123 Customer Reviews)

These sturdy square U-bolts let you secure 2 double U-bolt bolster brackets or 4 standard bolster or bunk board brackets to your boat trailer's frame. Galvanized steel is durable and corrosion resistant. Hardware included.

by:

Thanks to Trevor, who understood my Malone Microsport trailer better than I did. Need ubolts to attach boat bunk risers to the frame. When I got the ubolts I checked them on the side rails - and they were too small. I was ready to send them back when I figured I’d check them on the cross members, which go INSIDE the side rails and Voila! Perfect fit. One would think that, having assembled the trailer, I would have remembered that. The risers go on the cross members, not the side rails. Guess that’s why I called to make the order - etailer staff know their stuff! Thanks, Trevor!



by:

High quality hardware, buy with confide nce.



by:

Excellent galvanized coating. Quality hardware, i tightened down a good bit on them and no problems. Good stuff!



by:

Exactly what I wanted and They gave me all the help I needed

Daniel

3/3/2024

Everything is still working just like its supposed to! Thanks you guys

Etrailer Expert

Jerred H.

3/4/2024

@Daniel You're welcome!


by:

Used these as part of a full boat trailer rebuild. They were sized perfectly and of very high quality. After a year of use these are performing excellently.



by:

They where easy to install... Heavy duty ... Worth every penny big to Etrailer...



by:

Good quality product. Unfortunately, I need a shorter u-bolt length to fit the frame on my trailer, so will be returning.



by:

My jetski trailer needed new bunks and hardware, I called these guys to verify what I needed. They hooked my up with good quality parts. I do wish however they would have included the lag screws needed for the bunks.

Eric

5/29/2017

Still great



by:

Very impressed with e trailer everything I ordered was received the way I wanted it everything works great rebuilt a boat trailer From the ground up very happy still tows down the highway no problems

Eric V.

8/22/2017

The product is still working great !



by:

bolted right up. Could not be happier.



by:

Exactly what I needed



by:

Ordering was smooth and shipped out from ETRAILER was lightning fast.
U Bolt and Bolster bracket are heavy duty enough. They should screw down the swivel on bolster bracket a lot more because it was pretty annoying moving around while mounting it.
The guide rail bracket holes were a bit too close to the frame, making it difficult to use a ratchet
end wrench placement and removal difficult. Without using ratchet, it will take you several minutes to put a nut on just one.
Quality is good!



by:

Service and follow up was phenomenal.



by:

Good quality U-bolts and swivel bracket assemblies. They are not a direct fit for my Caulkins trailer. I will have to devise a tapered shim for the bolsters so that they will run parallel to the outside rails. I had not counted on a custom installation.



by:

Completely updated the axle, suspension, and added roller bunks to my waverunner trailer. Have taken the waverunner in for the winter and back out for the summer one time. All components were great and the trailer rides really well!



by:

The U-bolts need to be threaded further up the bolt. It may work ok for larger sized boat trailers that have thicker rails. I have a 16 foot jon boat that has a trailer with rails that are thinner in depth. So matter which way I placed the bracket, the u-bolt would not tighten all the way down. I had to create a spacer to be able to tighten the bracket with the u-bolt. Threading the bolt further would solve the problem.



by:

All the parts came as ordered,very pleased with everything. Got the bunk boards mounted and my boat seems to sit on them as i expected. I purchased stainless steel lag bolts to attach the bunks to the brackets. Parts arrived UPS all packaged in a large box with lots of packing paper,loose items all wrapped nice so nothing got lost.



by:

Shipping box half open. More tape?? bolt package open not all lock washers included. Nothing major. I’ll get another one at Lowes

Etrailer Expert

Jenny N.

4/7/2022

I will have our Customer Service team reach out to you.



by:

Exactly what I needed. Easy checkout and Very fast shipping.



by:

GREAT Customer Service!! Seth worked with me to get the exact size and type of bolts needed for the job. Prompt delivery and up to date tracking. This is how a business should handle their customers. Bolts are heady duty galvanized. Will easily replace the rusted bolts that hold the bunk board brackets.



by:

Good quality product. Seems to be well constructed. All parts were included. The best part was not having to hunt down individual components when you can buy a complete set. Packaging was good. This will make installation of bolster brackets for my boat trailer a breeze. I would definitely buy from etrailer in the future.



by:

The products purchased were solid and of good quality. I'm impressed.
We purchased a used Jon boat and are upgrading the trailer and boat to for our satisfaction. We would not hesitate to purchase other products for etrailer. The videos were very helpful and informative. If I can I will add photos of before and after, soon.



by:

all expected parts arrived in excellent condition and as promised.
dimensional diagrams for the CE Smith Bolster & Swivel bracket would be helpful for choosing an accurate size.

Otherwise, I'm very satisfied with my order.



by:

Bought several parts from eTrailer to complete this restoration and transformation of a 1958 trailer to suit my needs today. Couldn't have done it in only 4 days without the help from this great company with quality products!



by:

Sturdy with a good galvanized coating. Its holding up well in our coastal environment.


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Show More Reviews

See what our Experts say about this CE Smith Boat Trailer Parts

  • Parts Needed to Convert a Boat Trailer to Bunk Boards
    It sounds like you are wanting to convert a boat trailer to bunk boards. There is not a kit for this because each trailer/boat varies. To do the conversion you will need the bunk boards, brackets and u-bolts. It is recommended to have bunk boards that are at least 50% of the length of your boat. You can have longer boards if you would like, but you want at minimum 50% of the length. I have included the length of bunk boards that we carry below. You can piece the lengths together as needed...
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  • Keel Roller for 1975 Wellcraft V20 Boat Trailer
    For the crossmembers the CE Smith Deep V Keel Roller Assembly part # CE10403G would work really well. It's pretty common to use one of these on each crossmember so it would work pretty well. Then for U-bolts you'd want the part # CE15283GA-4.
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  • Parts Needed to Add Bunk Boards to a Utility Trailer
    To add bunks, you will need the bunks, brackets, and u-bolts. Bunks - CE Smith Carpeted Bunk Boards # CE27845 Brackets - CE Smith Bolster and Swivel Bracket Assemblies # CE10000G-4 U-bolts - CE Smith U-Bolts # CE15283GA-4 This is typically done on boat trailers, that already have the proper crossbars in place. Since you are converting a utility trailer, you may need to make some modifications to add crossbars, if there are not any already in place.
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    This can absolutely be done. While there are not "kits" for doing the conversion, we do have the parts that you will need. These are not kitted together because each boat/trailer combination is different, so it is easier to not kit them. It is recommended to have bunk boards that are at least 50% of the length of your boat. You can have longer boards if you would like, but you want at minimum 50% of the length. Since your boat is 21', you will want bunks that are at least 10.5' long. I...
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  • Parts Needed to go From Roller Bunks to Bunk Boards
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  • Replacement Carpeted Bunks For Boat Trailer Recommendation
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    For bunk brackets we have CE Smith Bolster and Swivel Bracket Assemblies # CE10000G-4 as well as others at different lengths. To attach the brackets to the trailer frame you can use U-bolts such as # CE15283GA-2 which are 3-13/16 inches long, 3-1/16 inches wide, and have a 1/2 inch diameter. Or you could use # CE15283GA-4 which is the same thing only it comes with 4 U-bolts instead of 2. These mounting slots, are a length of 2-3/4 of an inch. There is a width of a 1/2 inch spacing in...
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Info for this part was:

Employee Lindsey S
Written by:
Lindsey S
Employee Jameson C
Expert Research:
Jameson C
Employee Joshua S
Video Edited:
Joshua S
Employee Cole B
Installed by:
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Updated by:
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