Product Description
Mounting Brackets: Secure Your Rack Box to the Truck Frame with a Complete U-Bolt Kit. Made in the USA by AMERICAN TRUCKBOXES ATB®️.
This U-bolt mount kit is built for contractors and fleet operators installing an I-shape rack box on a C-frame truck chassis. Four U-bolts with matching U-clamp brackets clamp the box directly to the frame rail, so it stays put over rough job sites and highway miles. American Truckboxes LLC manufactures every mount kit in Blanchard, North Dakota, to the same standard as its truckbox.com toolbox line. The kit is available in two center-to-center spacings to match your rack box footprint, and custom sizing is available for fleet orders.
- Complete mounting hardware: four U-bolts, four U-clamp brackets, washers, nuts, and a mounting cross included in every kit
- Frame-ready fit: sized for a 20 inch inner depth (ID) rack box, with 5/8 inch or 3/4 inch bolt diameter options
- Two center-to-center spacings: 4-5/8 inch CC (5/8 inch bolt) or 4-3/4 inch CC (3/4 inch bolt) to match your box
- Vibration protection: rubber isolators cushion the mount point and reduce metal-on-metal wear during transport
- C-frame installation: designed specifically for mounting rack and toolbox units to a truck's C-frame rail
- Guided setup: installation sheet included, with the full installation catalog also posted on truckbox.com
- Corrosion-resistant hardware built to hold up under daily work-truck use
Specifications
Bolt Size: 5/8 in or 3/4 in | Center-to-Center: 4-5/8 in or 4-3/4 in | Inner Depth (ID): 20 in | Mounting: C-frame rack box installation | Weight: 24 to 28 lb | Warranty: 60-month limited (standard)
American Truckboxes LLC has manufactured mounting hardware and truck toolboxes in the USA for over 25 years. Call (888) 996-0376 or visit truckbox.com for custom sizing, fleet orders, or help matching a kit to your rack box.
Frequently Asked Questions
Q: Where is this mount kit made?
A: This U-bolt mount kit is made in the USA by American Truckboxes LLC in Blanchard, North Dakota. American Truckboxes has manufactured truck toolboxes and mounting hardware for over 25 years. See the full lineup at truckbox.com.
Q: What warranty comes with this mount kit?
A: Standard mount kits carry a 60-month (5-year) limited warranty. Custom or modified kits and auxiliary fuel tank hardware carry a 12-month limited warranty. Coverage applies to the original purchaser only and is non-transferable. Call (888) 996-0376 or visit truckbox.com for full warranty details.
Q: Can I order a custom size?
A: Yes, custom sizing is available for this mount kit. Custom and modified kits carry a 12-month warranty. Contact truckbox.com or call (888) 996-0376 to discuss your rack box dimensions.
Q: How do I know which bolt size I need?
A: Match the bolt size and center-to-center spacing to your rack box mounting holes. This kit is offered in a 5/8 inch bolt with 4-5/8 inch center-to-center spacing, and a 3/4 inch bolt with 4-3/4 inch center-to-center spacing, both sized for a 20 inch inner depth box. Check your box's mounting specs or call (888) 996-0376 before ordering.
Q: What is included in the kit?
A: Each kit includes four U-bolts, four U-clamp brackets, washers, nuts, a mounting cross, and rubber isolators, plus an installation sheet. The full installation catalog is also posted on truckbox.com.
Q: What is this mount kit used for?
A: This kit is designed to mount an I-shape rack box to a truck's C-frame rail using U-bolts and U-clamp brackets, so the box stays secured to the frame during daily work-truck use. It is not intended for flatbed or underbody mounting styles.
Q: Does the mount kit include installation instructions?
A: Yes, every kit ships with a printed installation sheet, and the complete installation catalog is available on truckbox.com for reference during setup.