Buyers Products UB623518 18 Inch Square Bend U-Bolt Kit - Complete

In this review the Buyers Products UB623518 18 in Square Bend U-Bolt Kit is evaluated for installers who need a straightforward, robust mounting solution for truck boxes and body-to-chassis connections. The single biggest reason to consider this kit is that it bundles forged 1/2 in tie bars with Grade 5 equivalent hardware, delivering a balance of strength and convenience for most light and medium duty truck mounting tasks. It is a practical kit for fleets and DIY mechanics who want a ready set of parts to secure boxes without sourcing individual components.

Key Features

• Complete kit: Four 5/8 in square bend U-bolts, eight hex nuts, and split lock washers are included to simplify installation without missing parts in most cases.
• Forged tie bars: The 1/2 in thick forged steel tie bars provide increased durability and resist bending under load when mounting truck boxes.
• Grade 5 equivalent hardware: Grade 5 equivalent bolts and nuts deliver reliable tensile strength suited to many body-to-chassis connections.
• Versatile lengths available: The kit is offered in various lengths to accommodate different truck chassis and mounting depths.
• Easy installation: The included nuts and split lock washers make assembly straightforward for a single installer or small crew.

Who It's For

This kit is aimed at truck owners, fleet managers, and professional installers who need a dependable, ready-made set of U-bolts and tie bars to mount service boxes or secure bodies to frames. It is especially useful when a quick replacement or a complete hardware refresh is required for medium duty trucks.

Those who need specialty corrosion-resistant finishes, nonstandard thread sizes, or higher grade hardware for extreme heavy duty towing should look elsewhere, as this kit focuses on standard Grade 5 equivalent strength and common sizes rather than specialty alloys or coatings.

Pros & Cons

Pros

• Well matched components provide a convenient, ready-to-install package for common truck mounting jobs.
• Forged 1/2 in tie bars add tangible strength and reduce the risk of deformation under load.
• Multiple length options increase compatibility across different chassis and box mounts.
• Customers report good value for money and generally easy installation.

Cons

• Some buyers have reported missing nuts or lock washers in rare cases, so inspect contents before installation.
• Not specified for specialty corrosion protection or applications requiring higher than Grade 5 strength.

Specifications

Kit contents	Four 5/8 in square bend U-bolts, eight 5/8 in hex nuts, split lock washers
Tie bar thickness	1/2 in forged steel
Bolt size	5/8 in diameter
Hardware grade	Grade 5 equivalent
U-bolt shape	Square bend
Intended use	Mounting truck boxes and connecting bodies to chassis

Our Verdict

The Buyers Products UB623518 18 in Square Bend U-Bolt Kit is a practical, cost-effective choice for most truck box mounting jobs, combining forged tie bars and Grade 5 equivalent hardware in one box. It is recommended for fleet maintenance and DIY installers who want a reliable, easy-to-install kit, but buyers should check the kit contents on receipt to avoid occasional missing small parts.

Frequently Asked Questions

Are all necessary fasteners included?
Yes, the kit ships with four U-bolts, eight hex nuts, and split lock washers, though some buyers have occasionally reported missing washers or nuts so inspect the package on arrival.

Will these fit my truck chassis?
The kit is available in various lengths to suit different chassis; confirm the required U-bolt length for your frame before ordering.

Are the tie bars strong enough for heavy loads?
The 1/2 in forged steel tie bars provide solid strength for mounting boxes and standard body connections, but for extreme heavy duty towing or specialized uses consider higher grade hardware.