1. Boat Trailer Parts
  2. CE Smith
  3. Roller and Bunk Parts
  4. U-Bolts
  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 8

CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 8

Item # CE15283GA-8
lowest price pledge
Our Price: $93.97
Boat Trailer Parts
Orders above $99 qualify for Free Shipping
Shipping Weight: 5 lbs
In Stock
CE15283GA-8 - 3-1/16 Inch Wide CE Smith Roller and Bunk Parts
zoom in icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

These sturdy square U-bolts let you secure 4 double U-bolt bolster brackets to your boat trailer's frame. Multipurpose U-bolts can be used for a variety of other applications. Galvanized steel is durable and rust resistant. Hardware included. Call 800-298-8924 to order CE Smith boat trailer parts part number CE15283GA-8 or order online at etrailer.com. Free expert support on all CE Smith products. Guaranteed Lowest Price and Fastest Shipping for CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 8. Boat Trailer Parts reviews from real customers.
  • All Info
  • Reviews (18)
  • Q & A (7)
  • Videos (2)
  • Photos
  • Why etrailer?

CE Smith Boat Trailer Parts - CE15283GA-8

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

These sturdy square U-bolts let you secure 4 double U-bolt bolster brackets to your boat trailer's frame. Multipurpose U-bolts can be used for a variety of other applications. Galvanized steel is durable and rust resistant. Hardware included.


  • 8 Heavy-duty square U-bolts let you secure 4 double U-bolt bolster brackets on your boat trailer
    • 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


  • Quantity: 8 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"


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 8

California residents: click here

Video of CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 8

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for CE Smith Galvanized U-Bolts Review

Today, we're going to take a look at the CE Smith u-bolt for the bolster bracket, part number C-E-1-5-2-8-3-G-A-dash-4. Note, these u-bolts are available in a quantity of one, part number C-E-1-5-2-8-3-G-A. A quantity of two, part number C-E-1-5-2-8-3-G-A-dash-2. Or eight, part number C-E-1-5-2-8-3-G-A-dash-8. Our u-bolt is 3 and 1/16th wide by 3 and 13/16th long. The bolt itself is galvanized, which after it's stamped and molded, it's dipped, giving it three to five millimeters thick coating around the steel. With the galvanized protection on our bolt, it's suitable for use even in salt water.

It's a square design, so it's designed for the square frame. Secure your bracket to your trailer. Supplied with the u-bolt will be a split-lock washer and nut for each leg of the u-bolt, making this the perfect heavy-duty u-bolt to secure your bracket to your trailer. Now let's go ahead and show you how to install it. To begin our install, we're going to remove the old or manufacturer's boards and brackets. Since we're removing the bunk boards and brackets, we're just going to take the u-bolts off the frame.

Quick tech tip: Before you remove your boards, take a tape measure and get the height of your board. That way, when you install your new brackets and rollers, you can set it back to the same height. Now as we have the boards loose, we'll go ahead and just take them off the trailer and set them aside as they will not be re-installed. Next, we're going to install the new CE Smith bracket, part number C-E-1-0-0-0-3-G. Our bracket will replace the old or manufactured bracket that we removed. The u-bolt will go around the frame into the bracket and they get secure with a split-lock washer and nut.

Let's go ahead and put them in place now. As we install our fasteners, we're just going to install them finger tight this time. Keep in mind, when you tighten your u-bolt, make sure you tighten down both sides evenly. Once we have our bracket installed, we'll go ahead and tighten it down. All right. Now here on our rear support, or rear portion of our frame, we're going to go ahead and install our bracket and u-bolt.

Our bracket and u-bolt are going to sit in the exact same position as the old or manufacturer's bracket. Then again to secure it, we'll use a split-lock washer and hex nut on each side of our u-bolt. Remember when tightening down your u-bolt, make sure you tighten down both sides evenly. Now, we'll go ahead and repeat the same process for the remaining brackets. We'll now go ahead and take the roller bunk, set it onto our brackets, and secure the bunk to the brackets. Now when securing your bunk to the brackets, the hardware is not supplied. I'm going to use a bolt and flat washer. It's going to go down through the roller bunk, then through the bracket, and underneath I'm going to add another washer and a nylon lock nut. Now once we have all our hardware in place, we can tighten it down. And there you have it for our review and install of the CE Smith u-bolt for bolster brackets, part number C-E-1-5-2-8-3-G-A-dash-4.

Customer Reviews

CE Smith U-Bolts - Galvanized - 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter - Qty 8 - CE15283GA-8

Average Customer Rating:  4.9 out of 5 stars   (18 Customer Reviews)

These sturdy square U-bolts let you secure 4 double U-bolt bolster brackets to your boat trailer's frame. Multipurpose U-bolts can be used for a variety of other applications. Galvanized steel is durable and rust resistant. Hardware included.

- CE15283GA-8

perfect fit matches the original The U bolts were a little long but made them work as well could have used a couple more. 789798

- CE15283GA-8

What I loved: VERY solid construction. Never have to worry about this part giving out. Recommended u-bolts were a perfect match. Installation was relatively quick (counting removal of old roller parts and installation of new bunk hardware and bunks: just under two hours). Adjustable height of bracket and ability to change angle of bunk made it easy to match the fit of the new bunks to the hull. Absolutely, would use this part and company again. 690342

- CE15283GA-8

I bought a 2007 16' Carolina Skiff for $3500 back in December. The dealer said there was nothing at all wrong with it and he went over it and winterized it. I finally got around to putting it in the water and saw that the bunk boards were in terrible shape, with one side rail guide-on falling off. I took it to a marina repair shop and was told it would be cheaper to buy a new trailer instead of replacing the bunk boards. I contacted Ashley at etrailer about buying a set of bunk boards and all of the brackets and hardware for it. $370.00 later I had a full set of bunk boards and guide-ons being shipped to me. I don't think I could find a new trailer for that price. It took longer to remove the old ones than it did to put the new ones on. About 3 hrs later I had a new trailer. These bunk boards and guide-ons fit my boat and trailer perfectly. Thank you Ashley and etrailer for great customer service and a very good product at a really decent price. 671942

- CE15283GA-8

I highly recommend 644672

- CE15283GA-8

Fit perfectly. Good quality. 607875

- CE15283GA-8

Just received all of the brackets needed to rebuild my trailer bunks. Cost half of what the local marine shop charges for same parts. This is second order for boat trailer parts. Allways correct and shipped quickly. 596633

- CE15283GA-8

Always great service dealing with you guys, not a problem with any of my multiple orders. Keep up the good work. George J. always follows up with me to see if everything is good. Am using these u-bolts to mount motorcycle ramp to jet ski trailer, to allow more versatility. 453198

- CE15283GA-8

Heavy duty, great fit. Thanks. 432013

- CE15283GA-8

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. 412324

- CE15283GA-8

Great customer service and pricing 398670

- CE15283GA-8

Very heavy duty u bolts would recommend to anyone thanks 383323

- CE15283GA-8

This product was as advertised and worked great with the bunk brackets I ordered. I could not have ask for a better fit. 362488

- CE15283GA-8

Thank you for getting the product to me in a very timely manner. It was pakaged the best I have ever seen. I was very impressed by the way it was shipped. Thank you again, it's always great to do business with you. Bob j 347522

- CE15283GA-8


every thing has been great on all that i ordered from you and your service was fantastic thank you for everything.
bob o - 02/07/2018


- CE15283GA-8

Well made 295290

- CE15283GA-8

Bunk board brackets, were made of quality and fit trailer frame well. Service and shipping was extremely good and fast, very happy with the customer service. 290354

- CE15283GA-8

These are good quality U-Bolts however I missed the fact they only have about 1.25 inches of thread. Trailer rails 1.5" and you have a whole lot of space to make up when mounting bunk rails. 5-flat washers and a lock washer bridged the gap. Just plan on an additional $3/bracket for the flat washers. 218307

- CE15283GA-8

Etrailer had by far the best prices when delivery was factored in. The entire order was packed well arrived quickly. I haven't installed any of the items but they look like great quality parts & will be a direct fit. I highly recommend Etrailer. 162930


Ask the Experts about this CE Smith Boat Trailer Parts

  • Torque for Installing Nuts of U-Bolt Kit # CE15283GA-8
    The correct torque spec for trailer suspension u-bolts will depend on the the diameter of the bolt. You will want to use the following depending on bolt size: 1/2" bolts: 45 ft/lbs - 70 ft/lbs 9/16" bolts: 65 ft/lbs - 95 ft/lbs 5/8" bolts: 100 ft/lbs - 120 ft/lbs 3/4" bolts: 140 ft/lbs - 160 ft/lbs Since the # CE15283GA-8 is a 1/2 inch diameter you'd want to go with 45-70 and you'd be good.
    view full answer...
  • Can Bunk Brackets Work as Replacements for Welded On Supports
    Yes, the CE Smith Double U-Bolt Bolster and Swivel Bracket Assemblies # CE10192GA-4 will work as replacements, and you're definitely doing the right thing in replacing them due to the corrosion. You will need to use the CE Smith U-Bolts # CE15283GA-8 to install these assemblies and both the brackets and bolts are galvanized for future protection from corrosion. If you are also looking to replace the bunk board carpeting we have a number of lengths available, such as the CE Smith...
    view full answer...
  • What are Benefits of Bracket Assemblies on Boat Trailer?
    Even if the boards can bear the weight of the boat, by concentrating the weight on a smaller, 3 inch surface, there is a greater risk to denting or deforming the hull of your boat compared to having the boat's weight spread out over a larger surface. To install your bunk boards, the assemblies you mentioned, the Bolster and Swivel Bracket Assemblies # CE10190GA-4 are the best overall option. They attach with a pair of U-bolts # CE15283GA-8 each for connection security, and both the...
    view full answer...
  • Replacement Bunk Brackets for Older Grady White Seafarer Boat Trailer
    Thank for the photos of your boat trailer! The CE Smith Double U-Bolt Bolster and Swivel Bracket Assemblies # CE10196G-4 that you referenced are a great option to replace the existing bunk system on your boat trailer. These bolster brackets and swivel bracket are both made from 7-Gauge, galvanized steel. The # CE10196G-4 have an overall height of 16-1/4 inches. These brackets are available in different heights options to help accommodate the shape of the boat's hull. The four bracket...
    view full answer...
  • What Does the Diameter of the U-Bolts Need to be for the CE Smith Bracket Assemblies # CE10190GA-4
    The diameter of the U-bolts that need to be used with the CE Smith Double U-Bolt Bolster and Swivel Bracket Assemblies # CE10190GA-4 is 1/2 an inch. If you do not have enough U-bolts, you can purchase 8 of them with the washers and nuts included with part # CE15283GA-8.
    view full answer...
  • U bolts Recommendation for Use with the CE Smith U-Bolt Bolster # CE10192GA-4
    The recommended U-bolts to use with the CE Smith Double U-Bolt Bolster and Swivel Bracket Assemblies # CE10192GA-4 are the CE Smith U-Bolts # CE15283GA-8 which are 3-13/16" Long x 3-1/16" Wide x 1/2" Diameter.
    view full answer...
  • Tallest Bunk Bolster Brackets to Clear Trailer Tires on a Boat Trailer
    Your best option is going to be bolster bracket set # CE10196G-4 which is a quantity of 4 so if you wanted 6 you would need 2 sets and you would have a couple of spares should they be needed. These are 16-1/4 inches long with some adjustability due to the slotted holes. For u-bolts use # CE15283GA-8 (which is a set of 8 because each needs 2 u-bolts).
    view full answer...

Do you have a question about this Boat Trailer Part?

  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality boat trailer parts for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate boat trailer part information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Written by:
Lindsey S
Expert Research:
Jameson C
Video Edited:
Joshua S
Installed by:
Cole B
Updated by:
Sarah W
Updated by:
Alexander C
Updated by:
Jenny M

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.