Trailer axle u-bolt — u-bolt + nuts kit. Sized 3" × 6-1/2" with 1/2"-20 thread in a round bend. Designed to secure a 3" diameter round trailer axle tube to leaf springs on trailers in the 3,500-5,200 lb capacity range. Meets standard OEM dimensions used by Dexter, Lippert, TRP, Al-Ko, and other major trailer axle manufacturers.

⚠️ U-bolts are one-use fasteners. Once torqued and stretched during installation, they should NOT be reused. Always install with new u-bolts when replacing leaf springs, axles, or doing any suspension work. Torque spec: 45-70 ft·lbs (verify with your axle manufacturer).

⚙️ Key Features

• Raw steel construction — heat-treated for stretch and torque retention
• Rolled threads — stronger than cut threads, resist stripping
• Standard OEM dimensions — direct fit for major axle brands
• Round bend — matches round axle tube profile
• 1/2"-20 thread — standard fine thread for trailer suspension

📐 Specifications

• Inside Width (axle clearance): 3"
• Length (leg depth): 6-1/2"
• Thread Size: 1/2"-20
• Shape: Round
• Material: Raw carbon steel, heat-treated
• Fits Axle Tube: 3" diameter round
• Fits Axle Capacity: 3,500-5,200 lb

🔄 Cross-References

This is an OEM-spec u-bolt built to standard trailer axle dimensions. It directly replaces u-bolts on axles from all major trailer manufacturers where the size, thread, and shape match — including Dexter, Lippert (LCI), TRP, TruRyde, Al-Ko, Hayes, and Redline axles. Match the dimensions listed above to your existing u-bolt to confirm fit.

🔧 What's Included

• (1) U-bolt
• (2) Matching hex nuts

🛠 Compatible Axles

Fits standard trailer axles with 3" round tube profile, including:

• Dexter — sprung axle applications in 3,500-5,200 lb range
• Lippert — CP/standard axles in 3,500-5,200 lb range
• TRP / TruRyde — standard sprung axles
• Al-Ko, Hayes, Redline — equivalent capacity axles
• Generic aftermarket trailer axles matching this dimension

🔄 Related Parts

• Tie plates — axle spring plates that pair with this u-bolt (sold separately)
• Matching nuts / locknuts — see "What's Included" above
• Complete u-bolt kits — if you need u-bolts + nuts together, look for our -83xx kit SKUs
• Leaf springs — replace these along with u-bolts for best results

💡 Pro Tip: Always replace u-bolts whenever you remove them. Apply anti-seize to the threads before installation (not the u-bolt body). Torque evenly in a criss-cross pattern to spec. Re-torque after the first 50 miles of use.

Questions about axle hardware? Call or text AAA Trailer at 517-225-1991 — we stock the full trailer suspension lineup including u-bolts, nuts, tie plates, axles, and springs. Same-day shipping from Howell, Michigan.

📞 Call/Text: 517-225-1991   🌐 AAATrailer.com

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• Address: 4675 East Grand River Ave, Howell, MI 48843
• Phone: (517) 225-1991 (Call or text)
• Hours: Monday to Friday: 10:00 AM - 5:30 PM | Saturday: By appointment

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