Product Description
Aluminum Semi Underbody Toolbox: Heavy-Duty Underframe Storage for Semi Trucks and Trailers. Made in the USA by AMERICAN TRUCKBOXES ATB®
The A-SG52 is a heavy-gauge aluminum underbody toolbox built for owner-operators and fleet managers who need secure, weather-tight storage beneath a semi trailer or truck frame. A full-perimeter automotive bulb gasket and concealed rain gutters keep chains, binders, and hand tools dry on every haul. American Truckboxes LLC manufactures each box at its plant in Blanchard, North Dakota. Custom sizes are available for non-standard frames and fleet orders.
- Weather-tight seal: automotive bulb gasket with concealed rain gutters blocks rain, snow, and road spray from the interior
- Tamper-resistant locking: DT-T-Handle locks resist prying and break-in attempts at every truck stop
- Heavy-gauge aluminum body: corrosion-resistant alloy holds up to road salt and chemical exposure without rusting
- Eight finish options: All Diamond TP, Diamond TP, Mirror, Mirror+Powder Black, Powder Black, Powder White, Smooth, or Raw/No Finish
- Drop door with HD cables: stainless-steel coated cables support the door to prevent hinge sag over years of daily use
- 93 standard sizes: H 14"–30", D 12"–60", W 20"–120" to match most semi and trailer underframe openings
- Mounting hardware sold separately: kits for C-frame, I-frame, under-deck, and top-mount configurations
- USA-manufactured: built and quality-inspected at the Blanchard, ND facility before shipping
Specifications
Material: Heavy-gauge aluminum | H 14"–30" × D 12"–60" × W 20"–120" | Finish: 8 options | Mounting: Underbody / underframe | Warranty: 60-month limited (standard); 12-month (custom or modified)
American Truckboxes LLC has built truck storage in the USA for over 25 years. Reach us at truckbox.com or (888) 996-0376 for custom sizing, fleet orders, or mounting kit selection.
Frequently Asked Questions
Q: Where is this toolbox made?
A: The A-SG52 Aluminum Semi Underbody Box is made in the USA by American Truckboxes LLC at our manufacturing plant in Blanchard, North Dakota. We have built heavy-duty truck and trailer storage for over 25 years. Learn more at truckbox.com.
Q: What warranty comes with this toolbox?
A: Standard A-SG52 boxes carry a 60-month (5-year) limited warranty for the original purchaser. Custom or modified boxes and auxiliary fuel tanks carry a 12-month limited warranty. The warranty is non-transferable. Visit truckbox.com or call (888) 996-0376 for full warranty terms.
Q: Can I order a custom size?
A: Yes. American Truckboxes builds custom-dimension underbody boxes for non-standard frame openings, specialty trailers, and fleet specs. Custom and modified boxes carry a 12-month limited warranty. Contact us at truckbox.com or (888) 996-0376 to discuss your requirements.
Q: Is this underbody toolbox weatherproof?
A: Yes. Each A-SG52 uses a full-perimeter automotive bulb-type door gasket with concealed rain gutters to seal the interior against rain, road spray, and snow. The door closes positively against the gasket around the entire opening.
Q: How does the lock system work?
A: The A-SG52 uses a DT-T-Handle tamper-resistant locking system. The T-handle mechanism resists prying, making it suitable for unattended parking where tool and chain theft is a concern.
Q: What finish and color options are available?
A: Eight finishes are available: All Diamond TP, Diamond TP, Mirror, Mirror+Powder Black, Powder Black, Powder White, Raw/No Finish, and Smooth. Use the finish selector on this page, or call (888) 996-0376 if you need a finish not listed.
Q: Does this box come with a mounting kit?
A: Mounting hardware is sold separately for C-frame, I-frame, under-deck, and top-mount configurations. Visit truckbox.com or call (888) 996-0376 to confirm the correct kit for your frame type.