Heavy-duty trailer axle u-bolt sized 4" × 8-1/8" with 5/8"-11 thread in a round bend. Fits 4" diameter round trailer axle tubes on trailers in the 9,000 lb capacity range. Direct-fit replacement for OEM Dexter, Lippert, TRP, CP, and Al-Ko axles. Sold individually — need a pair or complete kit with nuts? See our U-bolt 2-pack, 4-pack, and kit listings.

⚠️ U-bolts are one-use fasteners. Once stretched during install, they should NOT be reused. Always install with new u-bolts when replacing springs, axles, or doing any suspension work. Torque spec: 85-100 ft·lbs for 5/8" thread (verify with your axle manufacturer).

⚙️ Key Features

• Heat-treated raw steel — engineered for stretch and torque retention
• Rolled threads — stronger than cut threads, resist stripping under high torque
• OEM-spec dimensions — direct fit for major heavy-duty trailer axle brands
• Round bend profile — matches round axle tube

📐 Specifications

• Inside Width (axle clearance): 4"
• Length (leg depth): 8-1/8"
• Thread Size: 5/8"-11
• Shape: Round
• Material: Heat-treated carbon steel
• Fits Axle Tube: 4" diameter round
• Fits Axle Capacity: 9,000 lb

🔄 Cross-References

This u-bolt is interchangeable with the following manufacturer part numbers (OEM replacement):

• Dexter: 011-064-00
• Also Fits: 9K Dexter / Al-Ko / Hayes 4" tube axles

🔧 What's Included

• (1) U-bolt (nuts sold separately — see part 854-6038)

🛠 Compatible Axles

Heavy-duty trailer axles with 4" round tube profile in the 9,000 lb range:

• Dexter 9K / 10K GD / 10K HD / 12K / 15K sprung axles (as applicable)
• Lippert / LCI equivalent capacity axles
• TRP / TruRyde heavy-duty sprung axles
• Al-Ko, Hayes, Redline equivalent capacity axles
• Most OEM commercial / equipment / gooseneck / deckover trailer axles in this range

📦 Buy in Pairs or as a Kit

U-bolts typically install in pairs (one per side of axle). For convenience, we offer:

• 854-1064-2PK — 2 U-bolts (one axle side)
• 854-1064-KIT — 2 U-bolts + 4 matching locknuts (complete one-side kit)
• 854-1064-4PK — 4 U-bolts (tandem axle or both sides)
• 854-1064-4PK-KIT — 4 U-bolts + 8 matching locknuts (complete tandem kit)

🔄 Related Parts

• Locknuts (854-6038) — 5/8"-11 matching locknuts
• Tie plates — axle spring plates for this tube diameter
• Leaf springs — always replace with new u-bolts

💡 Pro Tip: For heavy-duty applications always torque in a criss-cross pattern in 2-3 passes. Re-torque after the first 50 miles and again at 500 miles to compensate for initial settling.

Questions about heavy-duty axle hardware? Call or text AAA Trailer at 517-225-1991 — we stock u-bolts, nuts, tie plates, and axle hardware for trailers from 2,000 lb utility up through 15,000 lb commercial. Same-day shipping from Howell, Michigan.

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

What sets us apart is our dedicated team of knowledgeable professionals who are always ready to assist. Great customer service isn't just a promise—it's the foundation of our success. We invite you to visit our showroom or reach out for personalized advice. Whether you're purchasing online or stopping by, we're here to make your trailer journey seamless. Visit Us Today

• 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

Thank you for considering AAA Trailer. We're excited to help you hit the road with confidence! If you have any questions, don't hesitate to contact us.

To deliver your favorite products, we have partnered with the UPS & FEDEX . We are ready to entrust them with your orders and are always on your side if something goes wrong.

 We will be happy to assist you with eligible returns, the return instructions, and the shipping address. If you need a return or exchange, send us an email so we can discuss a replacement.