3/8 inch Diameter Square U-Bolt

Rated 4.90 out of 5 based on 10 customer ratings
(10 customer reviews)


3/8 inch Diameter Square U-Bolt with Deep Nuts and Washers only. No tie plate is included or available.

Please note the inside corners of a Square Custom U-Bolt are slightly rounded and are not perfectly square as pictured.



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)
  • “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″
SKU: 3/8 inch dia U-Bolt Square Categories: , Tags: ,


John Dsuban Spring Service Inc.

Weight 0.35 lbs
Dimensions N/A
Inside Width

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Inside Length

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ITEM: is usually in stock. If u-bolt is for suspension use, re-tighten after the first 500-1000 miles. As new or repaired springs wear in, some settling of the spring pack will occur. Even a minor amount of this settling can cause a dramatic reduction in clamping force.


  • .375 (3/8) inch threads with a SAE thread pitch of 24 TPI
  • U-bolts up to 9/16 are Grade 5, while 5/8 and above are Grade 8.

We do not stock any form of stainless steel material. We do not offer any type of plating or galvanizing. All u-bolts we make are oil finish.

Physical properties:

150,000 PSI Minimum Tensile Strength; 130,000 PSI Minimum Yield Strength; 120,000 PSI Proof Load; 35% Reduction of Area; 10% Elongation. U-Bolts produced to SAE-J429 specification. This material is a cold drawn, stress relieved, micro-alloyed, 1541 modified steel. Please note that not all bending widths can be ordered on our web site.

For other information on our U-Bolts, please visit our U-Bolt information page.

Based on 10 reviews

4.9 overall

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  1. Rated 5 out of 5

    Chuck Klein (verified owner)

    Perfect fit. price is right. fast shipping

    Chuck Klein

  2. Rated 4 out of 5

    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. Rated 5 out of 5

    Grieg latterner (verified owner)

    High quality professionally made u-bolts strong and fit nicely

    Grieg latterner

  4. Rated 5 out of 5

    Ken R.

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

    Ken R.

  5. Rated 5 out of 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. Rated 5 out of 5

    Tim k (verified owner)

    Size was perfect

    Tim k

  7. Rated 5 out of 5

    Tom Schnur (verified owner)

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

    Tom Schnur

  8. Rated 5 out of 5

    Jerry Corgiat (verified owner)

    Very good quality. Great service and helpful phone support

    Jerry Corgiat

  9. Rated 5 out of 5

    Gene Krinn (verified owner)

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

    Gene Krinn

  10. Rated 5 out of 5

    Jack Jones (verified owner)

    They were exactly what I needed.

    Jack Jones

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