The Weather Guard 648-5-02 is a long 48 inch aluminum underbed box with a rugged gloss black finish and 8.6 cubic feet of locking storage. The 18 inch deep welded diamond-plate body is rust-proof and light, a workhorse for longer tools, chains and a full service kit under a flatbed, platform or dump body, and the gloss black ARMOR TUF coat hides grime while resisting salt. A weathertight drop-down door keeps gear dry, and the 48 inch length needs a long clear run of rail. Mounting hardware is not included, so match it to your frame and its length.
What's Included:
- 648 Underbed aluminum diamond plate truck tool box, gloss black
- Drop-down door with stainless steel locking compression latch
- Three-point latching system with a drill-resistant lock core
- Two door support chains that hold the door as a work shelf
- Full-perimeter weather seal with rain gutter, pre-installed
- Weather Guard installation instructions
- Note: mounting brackets and hardware are not included, choose hardware to suit your frame or body
Features
Lightweight Aluminum Diamond Plate
The 648-5-02 is formed from welded aluminum diamond plate, so it adds locking underbody storage without the weight of steel. Aluminum naturally resists rust and corrosion, which matters for a box that lives down near the road spray and salt.
Black ARMOR TUF Diamond Plate
A gloss black ARMOR TUF powder coat covers the aluminum diamond plate to fight corrosion, chips and fading and give the box a blacked-out diamond-plate look. ARMOR TUF is Weather Guard's toughest coating, made to survive the salt, chemicals and weather an underbody box faces.
Weathertight Drop-Down Door
A full drop-down door drops open on two support chains that hold it level as a handy work shelf, then closes against a rain gutter and full-perimeter weather seal. Your tools stay dry and protected from road spray, dust and debris in the 8.6 cu ft interior.
Stainless Locking Latch, Three-Point Latching
A stainless steel locking compression latch drives a three-point latching system with a drill-resistant lock core, so gear stays secure and the door pulls tight against the seal. The latch is easy to work even with gloves on.
Tool-Less QuickClip Door
The drop door adjusts from 90 to 180 degrees and pops off with QuickClips, no tools required, so you can drop it flat, use it as a loading shelf, or remove it entirely for full access and clip it back on in seconds.
Mounts Under the Deck, Frees Your Truck
The standard 18 in deep body mounts on the frame rail below a flatbed, platform, service or dump body, so heavy tools and equipment ride secure and out of the way while your deck or bed stays open. It is the way to add locking storage to a truck with no usable bed floor. Mounting hardware is not included so you can match it to your frame.
Fitment & Compatibility
| Application |
Fit |
| Flatbed, platform, stake and dump truck bodies |
Yes, mounts under the deck on the frame rail |
| Service and utility body trucks, enclosed trailers |
Yes, where frame-rail space and door clearance allow |
| Under a full-size pickup bed on the frame rail |
Yes, if there is room on the frame and clearance for the door to drop |
| Standard use inside a pickup bed |
No, this box mounts below the bed on the frame, not on the bed floor |
Underbed boxes mount on the truck frame rail below the deck of a flatbed, platform, service or dump body, or under a pickup bed where there is frame space. Fit is by available space and mounting, not by year, make and model. This box is 48 in long and 18 in deep, and the drop door needs room to swing down below it. Always measure the clear length along your frame rail and the drop clearance before ordering. Mounting brackets and hardware are not included, so plan to supply frame-appropriate mounting hardware.
Fitment checked before shipping: we confirm your truck and bed fit this truck tool box before it leaves the warehouse, so you get the right fit the first time.
Specifications
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Series: 648 Series Underbed
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Style: Underbed frame-mount box, single drop-down door
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Storage Capacity: 8.6 cu ft
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Exterior Dimensions: 48 in L x 18 in W x 18 in H
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Material: Welded aluminum diamond plate
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Finish: Gloss black ARMOR TUF powder coat
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Door: Single drop-down door, tool-less QuickClip hinges, 90 to 180 degrees, two support chains
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Latching: Stainless steel locking compression latch, three-point latching, drill-resistant lock core
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Weather Seal: Rain gutter with full-perimeter weather seal
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Mounting: Frame-rail mount below a flatbed, platform, service or dump body; mounting hardware not included
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Weight: About 56 lb (shipping)
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Warranty: Limited Lifetime
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Made In: USA
Installation
Type: Frame-rail mount below the deck, bolt-through (hardware not included) · Time: About 1 to 2 hours · Tools: Drill and bits, wrench or socket set, tape measure, marker, plus frame-appropriate mounting brackets and hardware (not included) · Difficulty: Moderate, plan the mounting points and support the box while you bolt it up
Choose a clear spot on the frame rail below the deck with room for the door to drop open, then mount the box to the frame using brackets and hardware rated for the load (not included). Support the box while you fasten it, and seal any drilled holes with zinc-rich primer to prevent rust. Follow the Weather Guard Aluminum and Steel Underbed Boxes installation manual for hole layout and best practices. Because the box hangs below the deck, use hardware and brackets sized for the weight of the box plus its contents.
Resources
Everything you need for your Weather Guard 648 Underbed Truck Tool Box, 48 in Black Aluminum, 8.6 cu ft, in one place.
Warranty, Shipping & Returns
Warranty. Limited Lifetime Warranty from Weather Guard against defects in materials and workmanship.
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.
Compliance. Mounting brackets and hardware are not included with this underbed box. Because the box mounts on the vehicle frame and carries load below the deck, use mounting hardware and brackets rated for the combined weight of the box and its contents, and confirm clearance so the drop-down door can open safely.
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