Trailer U Bolt Kit for 5200-7000lbs 3in Round Axle - Heavy Duty 7in

In this review the Trailer U Bolt Kit for 5200-7000lbs is examined for owners who need a dependable replacement set for a 3in round axle. The bottom line: this 7in, 1/2in diameter U-bolt kit is best for trailer builders and owners looking for a strong, corrosion-resistant way to secure axle and leaf spring connections without overpaying. The kit's heavy alloy steel construction and included plates, nuts and washers make installation straightforward, so the reviewer finds it particularly useful for routine trailer maintenance and axle rebuilds.

Key Features

• Fitment: Designed for 5200-7000 lb trailers with a 3in round axle, giving a direct replacement option for common medium-duty trailer applications.
• Durable material: Made from alloy steel to withstand heavy load and vibration, helping maintain integrity under towing stress.
• Corrosion protection: Each U bolt is coated to resist rust and exposure to environmental elements, extending service life.
• Complete hardware: The kit includes tie plates, 1/2in-20 nuts and washers so users have everything needed for a full axle clamp installation.
• Adjustability: The U-bolt structure allows for suspension customization and secure clamping to match trailer load and setup.
• Value pack: Eight 7in U-bolts per pack provide spares or the ability to service multiple mounting points without additional purchases.

Who It's For

This kit is aimed at DIY trailer owners, repair shops and trailer fabricators who need a reliable set of U bolts for medium-duty trailers. It suits people who perform suspension work, axle replacements or routine maintenance and want a ready-to-install package that includes plates, nuts and washers.

Those who should look elsewhere include owners of very light utility trailers with smaller axles or heavy commercial trailers exceeding the 7000 lb range; this kit is specified for 5200-7000 lb axles and 3in round shafts, so fitment and capacity must match the trailer specifications.

Pros & Cons

Pros

• Robust alloy steel construction provides strong clamping force for trailer axles and suspension.
• Complete hardware package reduces trips to the parts store by including plates, nuts and washers.
• Corrosion-resistant coating improves longevity in wet and salty environments.
• Eight U-bolts per pack give spares or allow servicing multiple mounting points in one purchase.

Cons

• Specified for 3in round axles and 5200-7000 lb trailers, so it is not suitable for smaller or much heavier axles.
• The finish may show surface marks from shipping or storage, though performance is unaffected.

Specifications

Product name	Trailer U bolt kits
Fitment	5200-7000 lb trailer axle
Axle diameter	3in round axle
U-bolt length	7in
Thread size	1/2in-20
Material	Alloy steel with corrosion-resistant coating
Package contents	8 U-bolts, 4 plates, 16 nuts and 16 washers

Our Verdict

The Trailer U Bolt Kit is a practical, value-minded choice for anyone maintaining or rebuilding a medium-duty trailer with a 3in round axle. With alloy steel construction, corrosion protection and a full complement of plates, nuts and washers, it covers common repair needs reliably and at a reasonable cost. Recommend it for DIYers and small shops who need a dependable replacement kit that reduces downtime and extra parts sourcing.

Frequently Asked Questions

Will these U-bolts fit my axle?
They fit 3in round axles specified for 5200-7000 lb trailers; confirm your axle diameter and trailer rating before purchase.

Is installation hardware included?
Yes, the kit includes tie plates, 16 nuts and 16 washers so no extra mounting hardware is required for a standard installation.

Are the U-bolts corrosion resistant?
Each U-bolt has a corrosion-resistant coating to help prevent rust from road and weather exposure.