Arrives before Christmas 
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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.
Features:
Specs:
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.
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Average Customer Rating: 4.8 out of 5 stars (322 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.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!
High quality hardware, buy with confide nce.
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.
Excellent galvanized coating. Quality hardware, i tightened down a good bit on them and no problems. Good stuff!
Exactly what I wanted and They gave me all the help I needed
They where easy to install... Heavy duty ... Worth every penny big to Etrailer...
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
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 !
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!
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!
Shipping box half open. More tape?? bolt package open not all lock washers included. Nothing major. I’ll get another one at Lowes
Jenny N.
4/7/2022
I will have our Customer Service team reach out to you.
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.
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.
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.
Good quality product. Unfortunately, I need a shorter u-bolt length to fit the frame on my trailer, so will be returning.
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!
Exactly what I needed
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.
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.
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.
Exactly what I needed. Easy checkout and Very fast shipping.
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.
Excellent quality and great price. Was thinking the U-bolts were a little high and I could save at walmart but I bought the recommended one from etrailer and I'm glade I did. Much higher quality and did not realize how heavy duty they needed to be. Great job etrailer!
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Daniel
3/3/2024
Everything is still working just like its supposed to! Thanks you guys