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  1. Trailer Leaf Spring Suspension
  2. Redline
  3. Boat Trailer
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  5. U-Bolts
  6. Square Axle - 2 Inch
Replacement U-Bolt for 2" Wide, Square Axles - 7/16" Diameter - Zinc Plated

Replacement U-Bolt for 2" Wide, Square Axles - 7/16" Diameter - Zinc Plated

Item # UBZC716X212X400
Our Price: $6.40
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Trailer Leaf Spring Suspension
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Shipping Weight: 0.36 lbs
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This 4" long U-bolt works with a U-bolt plate and another U-bolt to help secure your 2" wide, square trailer axle to its leaf springs. Sturdy, zinc-plated steel resists corrosion. Lowest Prices for the best trailer leaf spring suspension from Redline. Replacement U-Bolt for 2" Wide, Square Axles - 7/16" Diameter - Zinc Plated part number UBZC716X212X400 can be ordered online at or call 1-636-306-4830 for expert service.
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  • Reviews (41)
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Redline Trailer Leaf Spring Suspension - UBZC716X212X400

  • Boat Trailer
  • Snow Trailer
  • U-Bolts
  • Square Axle - 2 Inch
  • 4 Inch Long
  • 3500 lbs
  • 7/16 Inch Diameter
  • Redline

This 4" long U-bolt works with a U-bolt plate and another U-bolt to help secure your 2" wide, square trailer axle to its leaf springs. Sturdy, zinc-plated steel resists corrosion.


  • Replacement U-bolt acts as part of a trailer suspension system
    • Used with another U-bolt (sold separately) and a U-bolt plate (not included) to secure one side of your axle to a leaf spring, which is mounted to your trailer's frame
  • Square bolt fits square axle beams
  • Zinc-plated steel construction is heavy duty and corrosion resistant
    • Ideal for use on boat or snowmobile trailers
  • 1 U-bolt included


  • Application: 2" wide axles
  • Inner width: 2-1/8"
  • Length: 4"
  • Bolt size: 7/16"-14

U-Bolt Diagram

UBZC716X212X400 Redline Zinc Plated U-Bolt for 2" Square Trailer Axles - 2-1/8" Inner Width - 7/16" Diameter - 4" Long

Video of Replacement U-Bolt for 2" Wide, Square Axles - 7/16" Diameter - Zinc Plated

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

Video Transcript for Redline Trailer Suspension UBZC716X212X400 Review

Speaker 1: Today we're taking a look at the replacement U bolt for two inch wide square axles. This replacement U bolt acts as a part of a trailer suspension system. It's used with another U bolt, and a U bolt plate to secure one side of your axle to the leaf spring, which is mounted to your trailer's frame. Another U bolt and U bolt plate are sold separately and available at if needed. This square bolt fits square axle beams. It's a zinc plated steel construction, it's heavy duty and corrosion resist, so it's great on boat or snowmobile trailers and with this part number you get one U bolt.

It is designed for two inch wide axles. We can tell that by taking a measure from inside edge to inside edge. So if we take that, that measures around 2 1/8 inches, so it's perfect for a two inch wide axle. The length measurement is taken from the bottom of the U to the end of the threads and that measures four inches long and the bolt size, start with the diameter is 7/16 of an inch, that's the diameter of each post right here. So the bolt size is 7/16 by 14.

That's going to do it for today's look at the replacement U bolt for 2 inch wide square axles.

Customer Satisfaction Score:

Customer Reviews

Replacement U-Bolt for 2" Wide, Square Axles - 7/16" Diameter - Zinc Plated - UBZC716X212X400

Average Customer Rating:  4.7 out of 5 stars   (41 Customer Reviews)

This 4" long U-bolt works with a U-bolt plate and another U-bolt to help secure your 2" wide, square trailer axle to its leaf springs. Sturdy, zinc-plated steel resists corrosion.


Great hardware just slightly larger than 2” square. It will work for what I need just may require some bending.


I was looking for a pair of very special size U-bolts for a restoration project. I was having no luck at hardware stores or other sources on-line. I thought I was going to have to fabricate them from scratch until I came upon They had what I needed. The thread pitch-size and overall dimensions were exactly to the original factory specifications. . The person on the phone was very pleasant and ordering was easy and fast. The U-bolts arrived at my door a day and a half later! The quality was as good as the original bolts from the Ford factory. A perfect fit and the accessory bumper guards were completed. Glad I found the right parts and at a price that was very reasonable. Etrailer has a great selection and offers more choices than their competition. Check it out! Sincerely, Jerry L. ,Lancaster, Pa.


The products etrailer supplies are superior. The only confusing part is when I tried to track it provided a UPS tracking number, however, when it was delivered it came via Post Office so the tracking number never completed its routing foremat. No worries and no problem we got the items fine, but things got shifted in transit for some reason. thanks again!


i've made a steel Frame trailer with a wheel base the same as my golf cart. I needed u-bolts to hold the wooden box to the frame and Etrailer had the right size. They will work great holding it all together.


right part very satisfied fast delevery


I used the roller to bolster a keel of a trailerable boat, using a crossbeam of only 2"x2". I ended up using it differently than it was intended, lying on top of the crossbeam instead of on its side, because it fit and because it will be more sturdy in that direction. The U-bolts look OK, but not heavily galvanized, hopefully they will be OK in saltwater. There were no nuts or washers with the U-bolt, my fault, but a surprise.


Beefy. Bolt only. 7/16” hex nuts harder to find. SS nuts available, though.


Completely restored our 1987 8x 10 trailer, turned out great. I found all the required parts from etrailer. Shipping was fast. etrailer was excellent to deal with. Thanks etrailer, best regards


I needed a u bolt for 2 inch square tubing. My local trailer supply did not carry what I needed. etrailer did and it was shipped promptly and as advertised.


Works well to hold trailer bunks


I've ordered a few times from e-trailer and every time have been impressed with the speed of service. They've always had what I needed when I need it.


I had an unusual need for a U Bolt for a bracket on an old vacuum sweeper attachment for an older Deere mower. This was exactly what I needed and it was shipped very promptly. The description was very accurate and exact and part fit perfectly! Thank You!


This was a great Buy !


Product was exactly as advertised. Will order from etrailer in the future.


This component is made with high precision in that the bend angles are exact and the threads are of high quality allowing for finger tightening of nuts etc.


Iwas glad to find these, I'm planning on using them to hold the main tubes on my snowmobile trailer to the cross members.


Identical replacement for the rusted u-bolts I broke while repositioning bunk.


Very pleased with products and ease of ordering. Everthing arrived packed very well in sturdy boxes. Your web page is one of the best I've seen in a while, keep up the great service. I will be back to shop again and will be telling freinds about you. Thanks for being so detailed oriented.


Quality parts for great prices. Everything was just as described.


This was a good replacement part.


Wow! Fast shipping! Thanks etrailer


Products were as describe and delivered faster than I expected!


Exactly what I wanted and matched the specs as listed.


I received exactly what I ordered quickly. Perfect thanks.


nice info and nuts

Show More Reviews

See what our Experts say about this Redline Trailer Leaf Spring Suspension

  • Threaded Dimensions of U-Bolt part # UBZC716X212X400
    The threaded portion of the Replacement U-Bolt # UBZC716X212X400 measures 1-31/32 inches. I went out into our warehouse to determine this.
    view full answer...
    Image 1 for
  • Availability of U-Bolts that are 2 inches Wide and 4 inches Long
    The u-bolts we offer with the most similar dimensions to what you need is the part # UBZC716X212X400 which is 4 inches long and has an inner width of 2-1/8 inches. Normally this is used to secure 2 inch square trailer axles. I attached a review video for this for you to check out as well.
    view full answer...
  • 5 Inch Long U-Bolt Recommendation for Square Trailer Axles
    The closest thing we have that would potentially work for you would be the # UBZC716X212X400 but it's an inch too short. A better option would be the part # UBZC12X212X525 but it has a 1/2 inch diameter. See picture. I am assuming you are looking for axle u-bolts.
    view full answer...
    Image 1 for
  • Does the Replacement U-Bolt for 2 Wide, Square Axles Come With Nuts
    The Replacement U-Bolt for 2" Wide, Square Axles part # UBZC716X212X400 does not come with nuts. The bolts are 7/16"-14 so you can pick up nuts for them at any local hardware store. We do however offer a similar u-bolt in a kit which does come with nuts, the 2" Square Trailer U-Bolt Kit part # SP01-160. These u-bolts are slightly longer.
    view full answer...
  • Availability of 3 x 4 Inch Axle U-bolts
    Are you speaking of an axle U-bolt that joins the leaf springs to the axle? Is the width you mention the overall width of the U-bolt, or the inside width? We do offer a U-bolt kit similar to the # CE23102 kit you'd looked at. The # CE23103 includes 1/2 inch diameter U-bolts that are 4-1/2 inches long that have an inside span of 2-1/8 inches and an outside width of 3-1/8 inches as shown in the provided photo. CE Smith doesn't offer the U-bolts as a separate item, they're only available...
    view full answer...
  • Availability of 7/16 Nuts to Fit Redline Replacment U-Bolt UBZC716X212X400
    The reason why you couldn't find the matching 7/16"-14 nuts to go with the Replacement U-Bolt for 2" Wide, Square Axles - 7/16" Diameter # UBZC716X212X400 is because we do not carry them. We carry U-Bolt kits that include the matching nuts and washers, like part # CE15251A, which are the same grade (GR 5) and share the same dimensions (4" long x 2-1/8" wide x 7/16" diameter). Or, part # CE23103, which includes the more common 4-1/2" long x 1/2" diameter U-bolts for 2" square axles, hardware...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Adele M
Updated by:
Adele M
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Cole B
Installed by:
Cole B
Employee Lisa S
Written by:
Lisa S

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