GESEXI Underbody Truck Box Brackets 18×18 Set of 2 — Bolted Channel-Steel, Black Coated Durable Support

GESEXI 18"×18" underbody truck box brackets are a pair of bolted structural steel mounting supports designed to securely attach an underbody or trailer tongue toolbox to your truck frame.

These brackets provide a durable, corrosion-resistant foundation for installing underbody toolboxes, built from channel steel with a protective black coating. Sold as a set of two, they feature welded construction for rigidity and are shaped to match common toolbox mounting requirements. They are intended for bolted installation so you can mount or remove the toolbox without cutting or permanent alteration to the vehicle.

How do these brackets attach to my truck and toolbox?

The GESEXI brackets are bolted structural mounts that fasten to the truck’s frame and the toolbox base. Their welded channel-steel form gives straight, stable contact surfaces for both frame and toolbox, simplifying alignment during installation.

• 18" long channel-steel body for stable support
• Pre-configured bolt points for through-frame attachment
• Sold in a matched pair to position both sides of the toolbox

Will these resist rust and hold up outdoors?

Yes—GESEXI brackets are fabricated from steel and finished with a black protective coating to slow corrosion and extend service life in outdoor conditions. Regular inspection and touch-up of worn areas will prolong lifespan, especially in salted-road or marine environments.

• Durable steel construction for structural strength
• Black coated surface for basic corrosion protection
• Welded joints reduce flex and maintain alignment under load

What sizes and configuration should I expect?

Each bracket measures 18" long by 3.15" wide and 18" tall, providing a tall, narrow profile suitable for many underbody and tongue toolbox styles. The dimensions give clearance and leverage to hold the box away from frame features and road debris.

• Overall dimensions: 18" (L) × 3.15" (W) × 18" (H)
• Sold as a set of two brackets for left and right mounting
• Channel-steel construction shaped for common box bases

Will I need welding or extra hardware to install them?

These are bolted structural brackets, so welding to the vehicle frame is not required for standard installations. You will need appropriate bolts, washers, and locking nuts sized for your vehicle’s frame thickness—select hardware that matches the bolt holes and vehicle specifications.

• Designed for bolted installation—no permanent frame welding required
• Installer supplies grade-appropriate bolts and locking hardware
• Follow vehicle manufacturer torque and safety guidelines during installation

Who is this for: The GESEXI 18"×18" underbody truck box brackets are aimed at tradespeople, contractors, fleet managers, and DIY truck owners who need a reliable, removable mounting solution for underbody or tongue-mounted toolboxes. Choose these brackets if you want heavy-duty steel supports with a coated finish, sold as a matched pair for a secure, aligned installation without permanent frame modification.