Looking for the best fit U-bolt kits for your trailer setup? We offer a guide to the top 10 U-bolt kits, ensuring a secure and durable fit for your trailer’s leaf springs and axles.
Finding the perfect U-bolt kit is key for a strong trailer setup. These kits keep leaf springs and axles locked in place. Secure fits mean safer, smoother rides.
Our top picks handle 5,200lb to 7,000lb axles with ease. From 3″ round axles to 2-3/8″ sizes, we’ve got specs covered. Kits include U-bolts, plates, nuts, and washers for quick installs.
Real users rave about easy upgrades and rock-solid durability. Confidence starts here—trust our guide to pick the right kit. Your trailer deserves the best fit, guaranteed.
List of Top 10 Fit U-Bolt Kits
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LONFFERY U Bolts Kit Fit for 3″ 5200lb-7000lb Round Axle, 7″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 9/16″-18 Hex Nuts |
This U-bolts kit is perfect for trailer owners or mechanics needing sturdy parts to attach leaf springs to a 3″ round axle. It fits 5,200lb-7,000lb axles with 1-3/4″ or 2″ springs and includes all needed hardware for quick setup. |
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LONFFERY U Bolts Kit Fit for 2-3/8″ 3500lb Round Axle, 5-1/2″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 1/2-20 Hex Nuts |
This U-bolts kit is perfect for trailer owners who need a reliable and easy-to-install solution for mounting leaf springs to a 2-3/8″ round axle. It’s ideal for 3,500lb axles and works with 1-3/4″ or 2″ spring widths. |
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Aupar Heavy Duty Trailer U Bolt Kit – Fits 3″ Round Axles (5200-7000lbs) – 7″ Long(2pcs) |
This Aupar Heavy Duty Trailer U Bolt Kit is perfect for trailer owners who need a reliable and durable solution for their 3″ round axles. It’s ideal for those hauling heavy loads and wanting peace of mind during trailer use. |
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TRAILER SUPPLIES Grade 5 U-Bolt Kit –7” U-Bolts for 5,200–7,000 lb Axles, Fits 3″ Round Axle, 9/16″-18 Thread – Full Kit with Plates, Nuts, and Washers |
This Grade 5 U-Bolt Kit is perfect for trailer owners and DIY mechanics needing strong, reliable axle support. It’s ideal for utility trailers, horse trailers, or cargo haulers with 3-inch round axles rated 5,200–7,000 lbs. The complete kit includes all parts for quick, secure installation—no extra buys needed. |
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Camotokiit 1900-2-1600 Replacement Safety Chain U-Bolt Kit Fits B&W Gooseneck Hitches |
This product is perfect for RV owners and truck drivers needing to replace lost or damaged U-bolts on B&W gooseneck hitches. It includes all parts for quick installation and is built with durable alloy steel to handle harsh daily use. |
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LONFFERY U Bolts Kit Fit for 3″ 5200lb-7000lb Round Axle, 7″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 1/2″-20 Hex Nuts |
This U-bolts kit is perfect for trailer owners who need a reliable and easy-to-install solution for mounting leaf springs to a 3″ round axle. It’s ideal for DIY repairs or upgrades, ensuring a secure fit for your trailer. |
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Buyers Products UB623516 16 Inch Square Bend U‑Bolt Kit with Tie Bars, 4 Complete Kits, 5/8 Inch Bolts, Durable Strength, Grade 5 Equivalent Hardware for Securing Truck Boxes to Chassis Frames |
This product is perfect for fleet maintenance teams, truck body installers, and commercial vehicle upfitters needing a durable, reliable solution to secure truck boxes to chassis frames. Grade 5 hardware and forged steel tie bars ensure long-lasting strength for heavy-duty applications. |
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Heavy Duty Rear Suspension Leaf Spring U-Bolt Kit with Plates Compatible with 1988-1998 Chevy GMC C/K1500, Tahoe, Yukon, Fits 8.75″ Length for 2.5″ Wide Leaf Springs, Replace# 15592585 15592586 |
This product is perfect for truck owners with 1988-1999 Chevy or GMC pickups, SUVs, or Suburbans needing heavy-duty suspension upgrades. It offers a direct fit for 2.5″ leaf springs, durable zinc-plated construction, and includes all hardware for easy rear suspension installation. |
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Trailer U Bolt Kit for 5200-7000lbs 3″ Round Axle, Heavy Duty Trailer Axle U Bolts 7″ Long, 1/2” Diameter, 2” Thread Pitch by MCCKLE |
This Trailer U Bolt Kit is perfect for anyone who owns a 5,200-7,000 lb trailer and wants a safe, reliable, and easy-to-install solution. It’s ideal for DIY enthusiasts and trailer owners looking to upgrade or maintain their suspension system with durable, rust-resistant parts. |
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LONFFERY 312 Trailer Alex Shackle with U Bolts Kit Fit for 3″ 5200lb-7000lb Round Axle, 7″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 1/2″-20 Hex Nuts |
This LONFFERY 312 Trailer Alex Shackle with U Bolts Kit is perfect for trailer owners who need a reliable and easy-to-install solution for mounting leaf springs to a 3″ round axle. It’s ideal for axles rated 5,200lb to 7,000lb and works with 1-3/4″ or 2″ springs. |
Detailed Reviews
Discover the best U-bolt kits designed for your needs. Our curated list features top picks for secure and reliable trailer setups. Find the perfect fit with our expert guide. Get ready to upgrade your trailer with confidence.
1. LONFFERY U Bolts Kit Fit for 3″ 5200lb-7000lb Round Axle, 7″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 9/16″-18 Hex Nuts
The LONFFERY U Bolts Kit is perfect for mounting your trailer’s leaf springs to a 3″ round axle. It includes everything you need for a secure fit.
This kit has four 7″ long U-bolts, two U-bolt plates, and eight hex nuts. It fits axles with a capacity of 5,200lb to 7,000lb. The spring width options are 1-3/4″ or 2″.
Installation is easy and straightforward. This kit is designed to make your trailer setup simple and efficient.
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Perfect For:
This U-bolts kit is perfect for trailer owners or mechanics needing sturdy parts to attach leaf springs to a 3″ round axle. It fits 5,200lb-7,000lb axles with 1-3/4″ or 2″ springs and includes all needed hardware for quick setup.
Ready to Purchase?
2. LONFFERY U Bolts Kit Fit for 2-3/8″ 3500lb Round Axle, 5-1/2″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 1/2-20 Hex Nuts
Secure your trailer with the LONFFERY U Bolts Kit. This kit is perfect for 2-3/8″ round axles. It makes mounting leaf springs a breeze.
You’ll get four 5-1/2″ long U-bolts. Also included are two U-bolt plates and eight 1/2-20 hex nuts. Everything you need for a solid connection is in this package.
This kit is designed for easy installation. It’s a great choice for your trailer.
| Pros | Cons |
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Perfect For:
This U-bolts kit is perfect for trailer owners who need a reliable and easy-to-install solution for mounting leaf springs to a 2-3/8″ round axle. It’s ideal for 3,500lb axles and works with 1-3/4″ or 2″ spring widths.
Ready to Purchase?
3. Aupar Heavy Duty Trailer U Bolt Kit – Fits 3″ Round Axles (5200-7000lbs) – 7″ Long(2pcs)
Aupar Heavy Duty Trailer U Bolt Kit is built for 3″ round axles. It includes 7″ long bolts and tie plates for leaf springs.
Strong and secure. Made from high-quality steel for long use. Improved plates spread force better. Upgraded washers keep nuts tight.
Designed for trailers only. Works with major axle brands. Keeps your trailer safe and stable.
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Perfect For:
This Aupar Heavy Duty Trailer U Bolt Kit is perfect for trailer owners who need a reliable and durable solution for their 3″ round axles. It’s ideal for those hauling heavy loads and wanting peace of mind during trailer use.
Ready to Purchase?
4. TRAILER SUPPLIES Grade 5 U-Bolt Kit –7” U-Bolts for 5,200–7,000 lb Axles, Fits 3″ Round Axle, 9/16″-18 Thread – Full Kit with Plates, Nuts, and Washers
Upgrade your trailer with this robust U-bolt kit. It’s perfect for axles weighing between 5,200 and 7,000 lbs. Get a secure and reliable fit for your 3-inch round axles.
This kit features heavy-duty Grade 5 construction for lasting durability. You’ll receive everything you need for a complete installation. This includes four U-bolts, mounting plates, nuts, and washers.
Installation is a breeze. Simply replace your old parts for a safer ride.
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Perfect For:
This Grade 5 U-Bolt Kit is perfect for trailer owners and DIY mechanics needing strong, reliable axle support. It’s ideal for utility trailers, horse trailers, or cargo haulers with 3-inch round axles rated 5,200–7,000 lbs. The complete kit includes all parts for quick, secure installation—no extra buys needed.
Ready to Purchase?
5. Camotokiit 1900-2-1600 Replacement Safety Chain U-Bolt Kit Fits B&W Gooseneck Hitches
The Camotokiit 1900-2-1600 Replacement Safety Chain U-Bolt Kit is designed for B&W gooseneck hitches. It helps replace lost or damaged U-bolts quickly and easily.
This kit includes all necessary parts made from alloy steel. It can handle tough daily conditions, making it perfect for RV and truck use.
It comes with U-bolts, lock nuts, and springs. The kit also includes carriage bolts and flange nuts. This product is reliable and easy to install.
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Perfect For:
This product is perfect for RV owners and truck drivers needing to replace lost or damaged U-bolts on B&W gooseneck hitches. It includes all parts for quick installation and is built with durable alloy steel to handle harsh daily use.
Ready to Purchase?
6. LONFFERY U Bolts Kit Fit for 3″ 5200lb-7000lb Round Axle, 7″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 1/2″-20 Hex Nuts
Secure your trailer with the LONFFERY U Bolts Kit! This kit is your perfect solution for attaching leaf springs to your trailer’s round axle. It’s designed for strength and durability.
This kit fits 3″ round axles. It includes everything you need. Get ready for easy installation.
With 7″ long U-bolts and all the necessary hardware, this kit ensures a reliable and stable connection. Your trailer will be ready for the road in no time!
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Perfect For:
This U-bolts kit is perfect for trailer owners who need a reliable and easy-to-install solution for mounting leaf springs to a 3″ round axle. It’s ideal for DIY repairs or upgrades, ensuring a secure fit for your trailer.
Ready to Purchase?
7. Buyers Products UB623516 16 Inch Square Bend U‑Bolt Kit with Tie Bars, 4 Complete Kits, 5/8 Inch Bolts, Durable Strength, Grade 5 Equivalent Hardware for Securing Truck Boxes to Chassis Frames
The Buyers Products UB623516 is a complete mounting kit for truck boxes. It includes four sets of square bend U-bolts, nuts, washers, and tie bars. This kit is perfect for securing truck bodies to chassis frames.
Grade 5 hardware ensures durability and reliable clamping force. The forged steel tie bars provide even load distribution and stability.
This kit is ideal for commercial trucks, offering long-term strength and easy installation. Each kit is individually boxed for convenient handling and storage.
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Perfect For:
This product is perfect for fleet maintenance teams, truck body installers, and commercial vehicle upfitters needing a durable, reliable solution to secure truck boxes to chassis frames. Grade 5 hardware and forged steel tie bars ensure long-lasting strength for heavy-duty applications.
Ready to Purchase?
8. Heavy Duty Rear Suspension Leaf Spring U-Bolt Kit with Plates Compatible with 1988-1998 Chevy GMC C/K1500, Tahoe, Yukon, Fits 8.75″ Length for 2.5″ Wide Leaf Springs, Replace# 15592585 15592586
Upgrade your truck’s rear suspension with this Heavy Duty U-Bolt Kit. It’s made for a perfect fit on your 1988-1998 Chevy GMC C/K1500, Tahoe, and Yukon.
This kit is built to last, featuring a heavy-duty square U-bolt design and trusted corrosion defense with zinc plating. It’s designed for easy installation on 2.5″ wide leaf springs.
Get 4 zinc-plated u-bolts. It includes 1 left and 1 right U-Bolt Plate. All mounting hardware is included for a complete setup.
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Perfect For:
This product is perfect for truck owners with 1988-1999 Chevy or GMC pickups, SUVs, or Suburbans needing heavy-duty suspension upgrades. It offers a direct fit for 2.5″ leaf springs, durable zinc-plated construction, and includes all hardware for easy rear suspension installation.
Ready to Purchase?
9. Trailer U Bolt Kit for 5200-7000lbs 3″ Round Axle, Heavy Duty Trailer Axle U Bolts 7″ Long, 1/2” Diameter, 2” Thread Pitch by MCCKLE
Secure your trailer with the MCCKLE Trailer U Bolt Kit! This heavy-duty kit is designed for 5,200-7,000 lb trailer axles, ensuring a strong and dependable connection for your trailer’s suspension.
Crafted from premium, durable steel, these 7-inch long U-bolts are built to last. They feature a corrosion-resistant coating to stand up to tough conditions, keeping your trailer safe and stable on any journey.
Installation is a breeze. Get your trailer back on the road quickly. Enjoy peace of mind with this reliable kit.
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Perfect For:
This Trailer U Bolt Kit is perfect for anyone who owns a 5,200-7,000 lb trailer and wants a safe, reliable, and easy-to-install solution. It’s ideal for DIY enthusiasts and trailer owners looking to upgrade or maintain their suspension system with durable, rust-resistant parts.
Ready to Purchase?
10. LONFFERY 312 Trailer Alex Shackle with U Bolts Kit Fit for 3″ 5200lb-7000lb Round Axle, 7″ Long U-Bolts, U-Bolt Plates for 1-3/4″ or 2″, 1/2″-20 Hex Nuts
Upgrade your trailer’s suspension with the LONFFERY 312 Trailer Alex Shackle with U Bolts Kit. This kit is designed to securely attach your trailer’s leaf springs to a 3″ round axle, ensuring a stable and reliable ride.
The comprehensive package includes everything you need for a successful installation: four 7″ U-bolts, two U-bolt plates, eight hex nuts, four shackle straps, four bushings, and six bolts with nuts. This kit is perfect for axles ranging from 5,200lb to 7,000lb and fits springs that are 1-3/4″ or 2″ wide.
Installation is a breeze. Get back on the road quickly. Enjoy a smoother haul.
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Perfect For:
This LONFFERY 312 Trailer Alex Shackle with U Bolts Kit is perfect for trailer owners who need a reliable and easy-to-install solution for mounting leaf springs to a 3″ round axle. It’s ideal for axles rated 5,200lb to 7,000lb and works with 1-3/4″ or 2″ springs.
Ready to Purchase?
Buying Guide
Finding the right U-bolt kit? Secure fits make trailer setups safer. Real users trust these picks for smooth rides.
- Axle Size & Load Capacity: Match the kit to your axle’s size and weight limit. Kits fit 2-3/8″ to 3″ axles with 3,500lb-7,000lb ranges.
- Material Quality: Choose Grade 5 or alloy steel for strength. These resist bending under heavy loads.
- Included Hardware: Check kits for nuts, plates, and washers. Some add extras like shackles for easier installs.
- Installation Ease: Look for pre-matched parts and clear guides. Kits with all hardware save time.
- Compatibility: Confirm fit for your trailer or truck model. Some kits work with specific brands or years.
- Corrosion Resistance: Opt for zinc-plated or coated bolts. These last longer in wet or rusty environments.
- Price vs. Value: Balance cost with durability. More expensive kits often offer longer life and better parts.
- Warranty & Brand Trust: Pick brands with solid warranties. Trusted names often mean better support.
Confident trailer upgrades start here. Safe rides begin with the right U-bolt kit.