The UWS 48" truck side tool box sits low along the inside wall of the bed, which is the version to buy if you care about the view out the back window or you run a tonneau. The bed stays clear for sheet goods, a pallet or a dirt bike, and the box is still there when you need a 3/8" drive. It measures 48.75" long, 14.5" wide and 11.75" tall overall over a 48" x 9.25" x 8.75" tub, giving 3ft³ of lockable, weather-sealed storage. The tub is formed from a single piece of 0.058" aluminum and the lid carries the patented RigidCore foam-filled core, so a lid this long does not flex when you lean on it or bind after a couple of winters. It is secured by a keyed stainless steel push button, sealed with the MicroSeal gasket and finished in gloss black powder coat. Two mounting legs and two keys are in the carton; the bolts are not.
What's Included:
UWS 48" truck side tool box
2 mounting legs
2 keys
Features
3ft³ That Does Not Cost You the Bed Floor The tub measures 48" x 9.25" x 8.75", which is enough for cordless tools, a couple of impact sets and the consumables you do not want loose in the bed. Mounted on the bed wall it leaves the floor clear, so you can still drop a pallet in or lay a sheet of plywood flat.
Patented RigidCore Foam-Filled Lid The lid is filled with a solid foam core rather than left as a hollow aluminum shell. That is what stops a long lid from flexing when someone stands on it and what keeps it from twisting out of shape and binding against the tub, which is the way most truck boxes eventually fail.
One-Piece 0.058" Aluminum Tub The tub is formed from a single sheet of extra-thick aluminum, so there is no welded seam along the bottom of the box for water to find. Aluminum also means it does not rust where the finish gets chipped by a dropped wrench.
Lockable Stainless Steel Push Button The push-button latch is stainless steel and keyed, and it sits close to flush with the lid so there is nothing to snag a strap on. Two keys are included.
MicroSeal Gasket A full-perimeter gasket seals the lid to the tub to keep rain, road spray, dust and grit out. It is the part that decides whether your tools are dry after a highway run in the rain, and it is a cataloged replacement part when it eventually takes a set.
Designed, Fabricated and Welded in Florida UWS builds this box in its own Florida plant rather than assembling imported panels, and backs it with a limited lifetime warranty on workmanship and materials, one year on the finish and one year on parts.
Fitment & Compatibility
Application
Fit
Full-size pickups, 6'6" and 8' beds
✓ Yes, the 48.75" box fits along the bed wall with room to spare
✓ Yes, anywhere there is a flat vertical wall or rail to bolt to
Mounted across the bed rails as a crossover
✗ No, this is a side box, choose a UWS crossover box instead
Fit guidance: This is a universal-fit box, not a vehicle-specific kit, so what matters is the tape measure and not the year and model. Check three things before you order. First, the bed wall needs a clear straight run of at least 48.75". Second, the box hangs 14.5" into the bed and stands 11.75" tall, so confirm that clears your wheel well and anything else already mounted. Third, if you run a tonneau or a cap, check its rail and bow height against the 11.75" box height. Mounting hardware is not included and the legs mount on either side, so the same box works on the driver or passenger side.
Specifications
Model: 48" Truck Side Tool Box with Low Profile
UWS Part Number: TBSM-48-LP-BLK
Type: Truck side box, mounts inside the bed wall
Material: Aluminum, 0.058" one-piece tub
Finish: Gloss black powder coat
Capacity: 3ft³
Overall Length: 48.75"
Overall Width: 14.5"
Overall Height: 11.75"
Tub Length: 48"
Tub Width: 9.25"
Tub Height: 8.75"
Lid: Single lid, RigidCore foam-filled, self-opening
Type: Bolts to the inside wall of the truck bed using the two included legs · Time: About 45 minutes to 1 hour · Tools: Drill and bit set, ratchet and socket set, tape measure, level, marker · Difficulty: Easy, DIY-friendly
The two legs ship with the box, but UWS does not include the bolts, because the right fastener depends on whether you are going through the bed wall, into a stake pocket or into a flatbed rail. Plan on buying your own hardware. Set the box on the rail, level it, mark through the legs, and check underneath before you drill: bed walls have wiring and fuel lines behind them in places. UWS is explicit that a tool box is not a place for flammables or hazardous material, so no fuel cans, solvents, propane or cutting torches. Never load past the vehicle manufacturer's rated capacity.
Resources
Everything you need for your UWS 48" Low Profile Truck Side Tool Box, Gloss Black Aluminum, in one place.
Warranty. Limited Lifetime Warranty (One-Year Finish, One-Year Parts) from UWS, covering workmanship and materials. Normal wear, damage from overloading, and damage from improper installation are not covered. UWS stocks handles, locks, gas struts, gaskets, cables and keys as individual service parts.
Free shipping. This item ships free to the lower 48 states. Because it is an oversized item, it ships by freight and typically arrives in 3 to 7 business days.
Inspect on delivery. Please inspect the packaging before signing. If you see any damage, note it on the delivery receipt and contact us right away, and we will make it right.
About UWS
UWS is short for United Welding Services, and the name is the point. The aluminum boxes in this line are designed, fabricated and welded in Florida rather than assembled from imported panels, and the tub is formed from one piece of extra-thick aluminum so there is no seam along the floor of the box for water to work its way into. UWS is part of the CURT Group, a Lippert company, which is what puts a national warranty and a real replacement-parts program behind a box that is still built in a single plant. Handles, gas struts, lid gaskets, striker brackets and keys are all cataloged parts you can buy years later, which is the practical difference between a box you repair and a box you replace.
A side box earns its place by not costing you the bed. This one gives up 14.5" of width along one wall and leaves the floor and the rest of the bed completely open, which is why service techs, welders and framers often run a pair instead of a crossover. The low-profile lid keeps the box down near the top of the bed rail so it does not fill the rear window, and the push button sits close to flush so there is nothing proud for a strap to catch on. UWS backs it with a limited lifetime warranty on workmanship and materials.
Prestige Truck is an authorized UWS dealer. Every box we ship is new and in the factory carton, covered by the full UWS factory warranty, and backed by the UWS replacement-parts program if a handle, strut, gasket or key ever needs renewing.
Compare The Range
How this compares to similar models
The closest alternatives side by side, so you do not have to keep tabs open.
Model
This OneUWS 48" Low Profile Truck Side Tool Box, Gloss Black Aluminum (TBSM-48-LP-BLK)
UWS on how it sizes its boxes to real truck beds rather than to a generic template.
Useful background if you are cross-shopping and wondering why UWS lists so many lengths.
UWS Tough. Reliable
A short brand film from UWS covering how and where the aluminum boxes are built.
Context rather than product detail.
Frequently Asked Questions
Straight answers on specs, fit and support
Will the 48" box fit my truck?
It is universal-fit, so measure rather than match a model. You need 48.75" of clear, straight bed wall, 14.5" of clearance into the bed and 11.75" of height. On a full-size 6'6" or 8' bed that is easy. On a 5'8" short bed or a mid-size truck, measure the wall between the bulkhead and the wheel well before ordering.
Are the mounting legs and hardware included?
The two legs and two keys are in the carton. The bolts are not. UWS leaves the fasteners out because the correct one depends on what you are bolting to, so budget for hardware. If you would rather have a pivoting leg that adjusts from 0 to 55 degrees and comes with its own hardware and rivet nut tool, the UWS TBSM-MK2 adjustable leg kit is sold separately.
Can I mount it on either side of the truck?
Yes. The box is symmetrical and the legs bolt on either way round, so the same part number works on the driver or the passenger side. Many trades run one on each wall.
How weatherproof is it?
The lid seals to the tub with the MicroSeal full-perimeter gasket, which is designed to keep out rain, road spray, dust and dirt. It is a weather-sealed box rather than a submersible case, so treat it as rainproof, not waterproof, and it will keep tools dry through the weather a work truck actually sees.
What is the lid made of, and can I stand on it?
The lid uses the patented RigidCore design: a foam core filling the aluminum shell. That is specifically there to resist bending and warping, which is what causes a lid to stop lining up with the latch. UWS does not publish a stand-on load rating, so treat incidental standing as within design intent and do not make it a step.
What does the warranty cover?
A limited lifetime warranty on workmanship and materials, with one year on the finish and one year on parts. Wear items and damage from overloading or improper installation are not covered. Handles, gas struts, gaskets, cables and keys are all cataloged UWS service parts if you need one later.
Mark K.
Look is great. 100 lbs
Look is great. 100 lbs lighter than my 2nd pick. Lid lock and opening are smooth. Only minor knock I give is the the tie down hooks are hard to install - thinking I should have done them before installing.
DECKED Tool Box, Full-Size Truck Crossbed, 71.7" x 25.5" x 16", 300 lb Lid / 800 lb Tub, Black (DTB2-BLK)
Mark
A must have
I really like this mat. I was apprehensive at first but, the mat does a great job of keeping things from sliding around without having to secure it. perfect fit. But i think i will be adding some short screws to secure the mat to the DECKED system.
DECKED Battle Mat, Full-Size Long Drawer System 6'4" to 6'9" Bed, Recycled Nyracord Rubber, Black (A0075-BMXL-BLK)
Roy L.
I never knew how much I needed this
As with all BAK covers, the quality is amazing. What I didnt fully appreciate until installing was the ease of opening - especially in a lifted truck. No more need to find the right handhold. Just roll it back with a single hand. Its also great to see out of my rear window when fully open - something you lose with the fold back covers. Customer service is awesome. I has an installation question and the representative stayed on the line as I adjusted an alignment to ensure I did it properly.
BAK Revolver X4s Hard Roll-Up Tonneau Cover for 2022-2026 Toyota Tundra (6'7" Bed)
Jeffrey P.
Better then expected.
Searched for about 6 months to find the tonneau cover. I really wanted the security of a hard top without sticking above the bed rails it checked those boxes. I also did not want to drill my truck bed. The install was super simple my wife and I had it on the truck in about a half an hour.
BAKFlip MX4 Hard Folding Tonneau Cover for 2003-2025 Ram 1500 / 2500 / 3500 (8' Bed)
Joseph A.
The toolbox is nice. I
The toolbox is nice. I think Ill get a lot of years of service out of it. I like how the lid opens and the tie downs are a nice touch. It seems to be well built. And tough. Im pleased with my purchase and would buy another one.
DECKED Tool Box, Full-Size Truck Crossbed, 71.7" x 25.5" x 16", 300 lb Lid / 800 lb Tub, Fender Dirt (DTB2-TAN)
UWS 48" Low Profile Truck Side Tool Box, Gloss Black Aluminum (TBSM-48-LP-BLK)
UWS 48" Truck Side Tool Box, Gloss Black, Low Profile (EC30202)
UWS 69" Low-Profile Crossover Truck Tool Box with Pull Handles, Bright Aluminum (EC10481)
Weather Guard 530 Underbed Truck Tool Box, 30 in Black Steel, 5.6 cu ft (530-5-02)
