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3/8 inch Diameter Square U-Bolt

(19 customer reviews)

3/8 inch (24 threads per inch, SAE) Diameter Square U-Bolt with Deep Nuts and Washers only. No tie plate is included, see below for options. Oil finish only, no plating/coatings available. Grade 5.

The corners of our Square U-Bolts are not perfectly square and are slightly rounded for strength. To see sample, click here.

Price shown is for each U-Bolt including Deep Nuts & Washers. You must order in multiples of 2.

$8.64$14.18 Each U-Bolt

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3/8 inch Diameter Square U-Bolt is Custom Bent from the choices you make here. Please read the directions carefully.

3/8 inch Diameter Square U-Bolt
  • Pricing includes Extra Deep Nuts and Hardened Thick U-bolt Washers
  • Custom bent U-bolts are non-returnable.

Measure your U-bolt using the image above to to get your pricing.

  • “C” = Inside Width    (measure inside width)
  • “L” = Inside Length   (measure from the highest point inside to the bottom of the leg of U-bolt)
    • Note that the “L” measurement (length) may be slightly longer and is not exact depending on total rod length. The reason the “L” measurement may be longer (up to 3/4 of an inch) is we add “C” and “L x 2” measurements to get the total material length which is made in even lengths, 22, 28, 38 etc. We do not want your U-bolt to be shorter than the length you ordered.
  • “T” = Approximate Thread Length is calculated by multiplying 2 X “L” plus “C” (which equals the overall length of rod material before bending)
    • Approximate thread lengths are predetermined and are listed below;
      • (Total rod length = Thread length on each leg)
        • 8″   to 20″ = 2″-3″
        • 22″ to 30″ = 4″
        • 32″ to 48″ = 6″

These 3/8 inch Diameter Square U-Bolts are for suspension, leaf spring and body mounting primarily, but have hundreds of other uses. We bend our own U-bolts on a hydraulic bender cold so the grain of the metal stays oriented in the right direction for maximum strength.

The only thread pitch we use are SAE (fine) and are manufactured by rolling a rod between dies creating threads for maximum strength. This makes the non-threaded part of the stock slightly smaller in diameter than the diameter of the threads and are not thread-able beyond the way they are.

Small diameter U-bolts (especially 1/2 diameter and smaller) are more susceptible to measuring slightly wider due to the spring-like nature of the steel, but U-bolts, when properly torqued will typically conform to the shape of the item it is fitting over.

This product is not for ornamental use and is designed to be torqued.

SKU: 3/8 inch dia U-Bolt Square Categories: , , , Tags: ,


Dsuban Spring Service Inc.

Dsuban Spring Service and Dsuban.com is a repair facility and distributor of all types of suspension manufacturers. Call on us for your truck and trailer needs.
Dsuban Spring Service Cincinnati Ohio www.dsuban.com,

Based on 19 reviews

5.0 overall

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  1. Chuck Klein (verified owner)

    Perfect fit. price is right. fast shipping

    Chuck Klein

  2. Tom DeJohn (verified owner)

    Nicely made. I only wish I could have specified the exact length for my application rather than the few selections available. No matter though, I simply trimmed to the size I needed. Thanks!

    Tom DeJohn

  3. Grieg latterner (verified owner)

    High quality professionally made u-bolts strong and fit nicely

    Grieg latterner

  4. Ken R.

    Great product, exactly as advertised! Perfect fit, fast shipping.

    Ken R.

  5. Raymond Thompson

    Order arrived promptly.. The specs were exact.. The problem was solved.. The people who helped me with ordering were very kind… If I need something again I know were to find it.. Thamks

    Raymond Thompson

  6. Tim k (verified owner)

    Size was perfect

    Tim k

  7. Tom Schnur (verified owner)

    Great product, fast production time, speedy delvery, and ease of ordering

    Tom Schnur

  8. Jerry Corgiat (verified owner)

    Very good quality. Great service and helpful phone support

    Jerry Corgiat

  9. Gene Krinn (verified owner)

    Easy order. Exact specs. Quick delivery. Wish only could have been zinc dipped.

    Gene Krinn

  10. Jack Jones (verified owner)

    They were exactly what I needed.

    Jack Jones

  11. rick (verified owner)

    exactly what i needed


  12. Dave

    Absolutely perfect for my old slipper bars! Super fast turn around and shipping.


  13. WILLIAM (verified owner)

    bolts were as requested and delivered within 2 days with standard shipping.


  14. Philip Huebbers, Sr. (verified owner)

    Very good product, good service !

    Philip Huebbers, Sr.

    • Rich (verified owner)

      Thank You for the review and you business!


  15. Ben Miron

    Exactly as advertised. Fast shipping.

    Ben Miron

  16. Frank Higgins (verified owner)

    Product exactly as I ordered and great quality. Very fast delivery

    Frank Higgins

  17. Dan Woods (verified owner)

    Got exactly what I ordered. Great quality and would have been fast shipping but UPS delayed it by a week. That’s the only advice I would give this company, switch to FedEx.

    Dan Woods

  18. Josh smith

    good quality bolts, fast shipping

    Josh smith

    • Rich (verified owner)

      Thank you, Josh!!


  19. E. Christian

    Items were shipped and delivered very, very quickly. Thanks, you saved my project!

    E. Christian

Free UPS Ground Shipping on orders of $99 or more!


U-Bolt Information

Custom U-Bolts are made to your specifications, so measure carefully!

Before ordering, please visit our U-Bolt Information Page.