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  1. Boat Trailer Parts
  2. Redline
  3. U-Bolts
  4. Square U-Bolt
  5. 3 Inch Long
  6. 7/16 Inch Diameter
Trailer Square U-Bolts (Qty 2), 4-1/8" x 3" x 7/16"
Redline

Trailer Square U-Bolts (Qty 2), 4-1/8" x 3" x 7/16"

Part Number: 7164183UB
In Stock
$22.67
Boat Trailer Parts
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Trailer U-bolts ideal for boat, snowmobile, and standard utility trailers. Zinc Plated to resist corrosion. Square bend simplifies attachment of hardware to square trailer frames. 1-800-940-8924 to order Redline boat trailer parts part number 7164183UB or order online at etrailer.com. Free expert support on all Redline products. Great prices and Fastest Shipping for Trailer Square U-Bolts (Qty 2), 4-1/8" x 3" x 7/16". Boat Trailer Parts reviews from real customers.
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  • Reviews (705)
  • Q & A (0)
  • Videos (1)
  • Photos

Redline Boat Trailer Parts - 7164183UB

  • U-Bolts
  • Square U-Bolt
  • 3 Inch Long
  • 7/16 Inch Diameter
  • Zinc-Plated Steel
  • Redline

Trailer U-bolts ideal for boat, snowmobile, and standard utility trailers. Zinc Plated to resist corrosion. Square bend simplifies attachment of hardware to square trailer frames.


Features:

  • Trailer U-bolts ideal for boat, snowmobile, and standard utility trailers.
  • Zinc Plated to resist corrosion
  • Square bend simplifies attachment of hardware to square trailer frames
  • Length of threaded portions: 2"


  • Dimensions:
    • A: 4-1/8"
    • D: 7/16"
    • L: 3"
    drawing of ubolt


  • 7164183UB Trailer Square U-Bolts (Qty 2), 4-1/8" x 3" x 7/16"





    Video of Trailer Square U-Bolts (Qty 2), 4-1/8" x 3" x 7/16"
    Video Thumbnail Video Player Dialog

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




    Video Transcript for Hands-On with the Trailer Square U-Bolts (Qty 2), 4-1/8" x 3" x 7/16"

    Today we're going to be taking a look at part number 7164183UB. These are the trailer square U-bolts. Trailer U-bolts are going to be ideal for your boat, snowmobile, and standard utility trailers. They're going to be great for many different applications when it comes to attaching items to your square trailer frame. These U-bolts are going to be made with a metal construction. They're going to have a nice zinc plating on them, so they're going to stand up well against rust and corrosion.

    They offer the nice square bin that simplifies attachment of your hardware to your square trailer frame. The unit's going to come with two U-bolts, four flat washers, and four lock nuts. We're just going to go over some of the dimensions real quick of the U-bolts. Each one's going to be identical. The distance that we have between the actual bolts, so from this point here to this point here, that looks like it's going to give us a measurement of about four and one-eighth of an inch. The diameter of the bolt itself, that's going to give us a measurement of seven-sixteenths of an inch.

    Measuring from the inside bottom edge to the end of the threaded portion is going to give us a measurement of three inches. Then the length of just the threaded portion, that's going to give us a measurement of about two and one-sixteenth of an inch. The distance that we have between the bolts on center, that's going to give us a measurement of four and five-eighths of an inch. That's going to do it for today's review of part number 7164183UB.

    Customer Satisfaction Score:

    Ratings & Reviews

    4.8

    705 reviews
    5 Stars
    (605)
    4 Stars
    (66)
    3 Stars
    (19)
    2 Stars
    (5)
    1 Star
    (10)
    Review Sort Icon
    by:
    Though I have not had the opportunity to tow much distance since replacing the trailer parts, everything went together well and and is of good quality.
    by:
    Exactly what I needed to secure my cart hitch. Great item, great service. Have purchased several solid item from etrailer.
    by:
    I had a hard time finding just the right u-bolts to replace my old rollers, and these were the closest I could find to the right size. Would have been better if they were galvanized, but I can't fault eTrailer.com for that ... nobody else seemed to have them either.
    by:
    I ordered replacement u bolts, leaf springs and keel roller. Everything was an exact replacement part. This makes repairs/upgrade easy direct parts replacement. No modifying at all.
    by:
    on an old trailer where even soaking the old bolts in PB Blaster for a week didn't help. Now I can adjust the bunk rails easily like they should operate. Good quality and price.
    by:
    everything I expected. quality products and great customer service. thank you etrailer
    by:
    My order was shipped quickly and was in hand in three days. Exactly what I needed to repair my trailer. Great service.
    by:
    The product worked as expected, and customer service was great. Communication was timely and issues were resolved successfully.
    by:
    Products still holding up great and gets used daily in saltwater.
    by:
    Thanks guys part was shipped on time I got it installed okay and it works great.
    by:
    Good Part. No issues.
    Satisfied custome
    r.
    by:
    Fast Shipping .... Nice products, Excellent Service.
    I will purchase more from etrailer in the future.

    I will send pictures when I finish the boat trailer

    Thanks James C
    by:
    product is fine . but if I had non it was going take that long I would have maid my own u bolt
    by:
    Products arrived timely and well packaged. Thanks
    by:
    Product shipped quickly, and it was exactly what I needed!
    I would definitely recommend this company.
    by:
    Good price for a hard to find item.
    by:
    Very good delivery time Good quality products
    by:
    Very Strong and durable
    by:
    Excellent quality and exactly what I ordered.
    by:
    by:
    by:
    by:
    The distance between the holes do not match the U-Bolts.. only a couple mm off... but off.. I am underwhelmed as I specifically asked if they would work.
    I had to drill out the holes to make them bigger as the U-Bolt doesn't fit correctly as-is. Hard to show in pictures but I think you can see the issue.
    I tried to upload the pictures but they would not upload so I am emailing them separately.
    Fortunately, drilling the holes bigger seems to have solved the issue, but that really should not have been necessary, especially as I double checked that this plate would work with these u-bolts.
    by:
    Worked for upgrading the leaf springs on my boat trailer to 3,500lbs. Needed longer bolts. Standard size was long enough since the new spring have more plates.
    by:
    Strong hardware and good quality of hardware.
    Joshua profile picture

    Joshua

    6/3/2026

    Good travels straight down road better balanced than oem design in 1978

    25
    705
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    Info for this part was:

    Employee Laura H
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    Employee Noah M
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