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  1. Boat Trailer Parts
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  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
Shipping Weight: 3 lbs
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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:

Exactly what I needed



by:

bolted right up. Could not be happier.



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:

Service and follow up was phenomenal.



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:

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:

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:

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



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:

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:

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:

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:

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:

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:

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:

The parts came quickly, all well packed. The coating on them seems very good. Love the way the nuts and washers are packaged and ty wrapped to the u bolts. They should work out well.


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Show More Reviews

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

  • Recommended Hardware to Lift Boat Bunks on Trailer
    I would also assume you're correct. If you have regular bunks on your trailer, you can just use taller bolster brackets and reattach the boards to raise them. For a 16 1/4" tall bracket, you can use the CE Smith Double U-Bolt Bolster and Swivel Bracket Assemblies # CE10196G-4, for a 13" tall bracket you can use # CE10002G-4, and for an 11" tall bracket you can use # CE10001G-4. From here, you can just reuse the u-bolts that you currently have, or you can use the CE Smith U-Bolts # CE15283GA-4.
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  • How To Install The CE Smith Roller Bunks for Boat Trailers # CE27710
    If you have adjustable brackets for the bunk boards then you could lower them down and mount the CE Smith Roller Bunks for Boat Trailers # CE27710 directly to them. If you don't have adjustable brackets then you would need to remove the bunk boards and install new brackets like the CE Smith Bolster and Swivel Bracket Assemblies for Roller Bunks # CE10003G-4. These brackets can be attached to the frame of the trailer with U-bolts like the CE Smith U-Bolts # CE15283GA-4. You'll want to measure...
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  • Replacement Bunk Boards and Brackets Needed for 1997 Esco Boat Trailer
    Typically yo'll use brackets like part # CE10000G-4 with U-Bolts like part # CE15283GA-4 and then a combination of bunk boards like the 3' long # CE27800, but since we don't have specs on what came with your 1997 Esco Boat Trailer you'll need to take some measurements of your trailer frame, your current hardware, and bunk boards to choose the correct replacement parts. Once you look at what is on your trailer you can either filter through the linked selection of boat trailer parts for...
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  • Which Replacement Bunk Brackets For Boat Trailer
    If you are wanting to use vertical bunk brackets like the CE Smith Heavy Duty, Vertical Bunk Brackets - 90 Degree - Galvanized Steel - 6" Tall - Qty 2 # CE10160GA-2, I recommend using them on the front and rear of the trailer. You will also need CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 2 # CE15283GA-2 to secure the brackets to your trailer frame. If you have a lighter boat and would rather have the bunk brackets that allow you to angle the bunk...
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  • Brackets for Adding Additional Bunk Boards to Magic Tilt Galvanized Kayak Trailer
    The problem is that your bunks need to face a different direction than what standard boat trailers have so it's hard to have a solution since your setup is unique. That said I don't see why you couldn't use CE Smith Bolster and Swivel Bracket Assemblies # CE10002G-4 attached to the rails front to back on your trailer so that could could mount the bunks. For a U-bolt kit you could then use the part # CE15283GA-4 to secure the brackets.
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  • Can I Install CE Smith Bolster Swivel Brackets On L Shaped Open Cross Member
    The CE Smith Bolster and Swivel Bracket part # CE10001G-4 attaches to the boat trailer frame with U-bolts. The brackets are designed to install on the inside of the cross member where the bunk boards would be on the frame. I recommend to use U-bolts part # CE15283GA-4 to install the brackets on the 3 inch channel cross member. I have attached a photo of what the install looks like on a trailer like yours.
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    Image 1 for
  • Recommended Bunk Boards and Brackets for Boat Trailer
    For your Calkins trailer, I recommend using the CE Smith Carpeted Bunk Boards for Boat Trailers - 6' Long - 1 Pair # CE27840. These bunk boards will install with the CE Smith Bolster and Swivel Bracket Assemblies # CE10001G-4 as well as CE Smith U-Bolts # CE15283GA-4.
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  • How Do CE Smith Heavy Duty, Vertical Bunk Brackets CE26233-34GA Get Installed?
    You are correct. You will want to mount the longer 95 degree bracket of the CE Smith Heavy Duty, Vertical Bunk Brackets - 85 and 95 Degree Set # CE26233-34GA on the lower section of the angled crossmember on your boat trailer, and the 85 degree bracket on the higher section of the crossmember. In addition you will need 1/2" diameter U-bolts to secure the brackets to the crossmember. If your crossmember is 3" x 3" then I recommend the CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16"...
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  • Recommended Placement of Bunk Boards on Bayliner Capri 1950
    After completing a very thorough image search online, it appears that the most common bunk placement is about 2/3 of the way between the keel and the ridge that runs along the side of the hull. Rather than on end, most of the bunks I saw had the board meeting the hull on the flat. This disperses more of the weight of the boat along the bunk. The # CE27820 bunk boards you mentioned would be perfect. I'd also recommend using # CE10001G-4 bunk brackets and # CE15283GA-4 Galvanized u-bolts.
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  • What is Needed to Mount Roller Bunks in Boat Trailer
    You'll just need brackets in order to mount the CE Smith Roller Bunks for Boat Trailers - 4' Long # CE27700 and 5' Long # CE27710. Use the CE Smith Bolster and Swivel Bracket Assemblies for Roller Bunks # CE10003G-4 with CE Smith U-Bolts # CE15283GA-4.
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  • Parts Needed To Convert Boat Trailer From Rollers To Bunk Boards
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  • U-Bolt Kit for Use with CE Smith Heavy Duty Vertical Bunk Brackets CE26233-34GA
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  • Parts Needed to Replace 12 x 2-1/2 Inch Rollers on Boat Trailer
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  • Bunk Boards and Brackets That Allow for Angle Adjustment
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  • Replacement Brackets And Hardware For Boat Trailer Bunk Boards
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  • Are There 7 Foot 2x4 Bunk Boards For Jet Ski Trailer
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  • Are U-Bolts Included With CE Smith Bolster and Swivel Bracket Assemblies
    The CE Smith Bolster and Swivel Bracket Assemblies # CE10000G-4 only come with the brackets, U-bolts are sold separately. For U-bolts you can use the CE Smith U-Bolts - Galvanized # CE15283GA-4.
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  • Availability of 7 Feet Long 2 x 4 Carpeted Bunk Boards for a Boat Trailer
    The longest carpeted bunk boards we currently offer is 6 feet in length. It's the CE Smith part # CE27840 and each 6-foot long 2x4 is covered in marine grade carpet. You can easily construct some bunks yourself. Go to your local lumberyard and get some yellow pine 2x4x10 boards. You can then purchase some of the marine-grade carpet we offer, like part # CE11372. You'll need one roll per bunk, which means you'll have some scrap left over, which you can utilize as needed for other projects....
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    It sounds like you are just wanting to switch to carpeted bunk boards. For that you can use the CE Smith Carpeted Bunk Boards for Boat Trailers, which come in a number of different lengths: 5 feet long # CE27820, 6 feet long # CE27840 or 7 feet long # CE27845. To install these you can mount them to brackets that are already on your trailer or use CE Smith Bolster and Swivel Bracket Assemblies; you would need two of these per bunk board. The assemblies are available in different lengths...
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    view full answer...


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Info for this part was:

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Written by:
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