Weather Guard 121 Aluminum Crossover Truck Tool Box, Full-Size Low-Profile, Gloss Black (121-5-04)

$1,340.00 Regular price $1,845.99 Save $505.99
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Weather Guard Truck Box Hardware Installation Guide

Weather Guard's official hardware video zooms in on the clamp and bolt kit that secures its truck boxes to the bed rails without drilling. It is a helpful close-up companion to the full box install and shows how the mounting brackets hook under the rail lip and tighten down. Use it alongside the printed instructions that ship with the box.

How the 1Key UltraLock System Works

A step-by-step look from Weather Guard at what the 1Key UltraLock actually does: how the cylinder accepts a new code, why the red push button retracts when the box is locked, and how the latch pulls the lid down against the seal. Worth two minutes before you set the box up.

How to Code Your 1Key UltraLock Lock

Weather Guard's official walkthrough for coding the lock so this box opens with the same key as the rest of your Weather Guard boxes. Follow it once when the box arrives and you can stop carrying a separate key for every lid on the truck.

Weather Guard Truck Box Hardware Installation Guide

Weather Guard's official hardware video zooms in on the clamp and bolt kit that secures its truck boxes to the bed rails without drilling. It is a helpful close-up companion to the full box install and shows how the mounting brackets hook under the rail lip and tighten down. Use it alongside the printed instructions that ship with the box.

How the 1Key UltraLock System Works

A step-by-step look from Weather Guard at what the 1Key UltraLock actually does: how the cylinder accepts a new code, why the red push button retracts when the box is locked, and how the latch pulls the lid down against the seal. Worth two minutes before you set the box up.

How to Code Your 1Key UltraLock Lock

Weather Guard's official walkthrough for coding the lock so this box opens with the same key as the rest of your Weather Guard boxes. Follow it once when the box arrives and you can stop carrying a separate key for every lid on the truck.

Frequently Asked Questions

Straight answers on specs, fit and support

Will the 121-5-04 fit my truck?

It is a full-size low-profile crossover, or saddle, box that mounts across the top bed rails behind the cab, so it fits full-size pickups such as the F-150, Silverado and Sierra 1500 through 3500, Ram 1500 through 3500, Tundra and Titan. It needs about 72" of rail-to-rail width. Measure your bed rails and check clearance behind the cab first, and note it is not designed for compact or mid-size trucks.

Does it require drilling to install?

No. The box ships with under-rail clamps and hardware, so it mounts without drilling into your truck. Most installs take about 20 to 30 minutes and go easiest with two people to lift and hold the box while you clamp it down.

How secure is this Weather Guard box?

It uses the Weather Guard 1Key UltraLock system with tamper-resistant push-button locks that sit recessed when locked, so you get a quick visual cue your gear is secured. The 1Key design also lets you code multiple boxes on a truck or a whole fleet to a single key.

Does the gloss black finish hold up to sun and weather?

Yes. The gloss black ARMOR TUF powder coat is a hard, UV-stable and corrosion-resistant coating, and the full-perimeter D-shaped weather seal keeps the contents dry. It resists chips and fading through seasons of loading and road spray.

Will the gloss black finish scratch or show dust easily?

The gloss black ARMOR TUF powder coat is a hard, chip-resistant coating built for work trucks, so normal loading and unloading will not mar it easily. Like any glossy surface it can show fine dust, which wipes off with a quick pass of a microfiber cloth.

What is it made of and how big is it?

It is built from welded aluminum diamond plate with a gloss black ARMOR TUF powder coat. The exterior measures 72"L x 20"W x 18"H with 11.0ft³ of storage, and it ships at about 81.5 lb, so it is strong yet lighter than a comparable steel box.

What our customers say

4.8 · 144 reviews

Photos from owners

+4
Rzr Verified
06/09/2025

Easy to install. Fits and looks great. Built strong enough to keep everything secure. Ship

Easy to install. Fits and looks great. Built strong enough to keep everything secure. Shipping was fast and no damage.

HomeDepotCustomer Verified
11/10/2024

Easy to install and top-quality manufacturing, Thicker gauge metal is superior to other br

Easy to install and top-quality manufacturing, Thicker gauge metal is superior to other brands I looked at. I considered lower quality brand to save money and so glad that I chose Weather Guard brand! It operates perfectly and we have had 4 major rain/wind storms and not a sign of moisture/dust on the interior. Locks on both sides and can unlock with just using one side, nice feature. Shipped to store and was in perfect condition, Excellent protection and palletized perfectly to avoid damages.

B fuller Verified
08/04/2026

Weatherguard

Fits well on 2500 ram truck

Jose Verified
07/13/2026

Toolbox for work

Also, experience employees are excellent with service

Dko3030
03/05/2026

Quality control, new locks, Huge key...

The first box i got was hot garbage. Horrible welds, not square at all, lid not centered terrible. I returned and got another and its fine. I'm not a fan of the new locks, they dont stay recessed when they are locked like they used to. Wish i had locks the old style locks and the new key is huge. It is by far the largest key on my ring.

Jim Shurling Verified
06/19/2026

Awesome product.

Great product. Looks great. Build well.

1MDP Verified
04/28/2026

does this fit in my truck?

this toolbox fits a crew cab silverado, am disappointed that no one seemed to know what trucks their toolboxes fit in. the difference between the standard and low profile is the distance from overhang and bottom of toolbox, standard is around 11 inches and the low profile is 13 inches.

bob app Verified
04/01/2026

Great box, well made

Great box, I had researched this for awhile, and finally found it at Trator Supply. Even better than the box was th customer service I got at the Belfast Maine store when I ordered it on line.

RonM
06/23/2025

Initial Review

Product arrived damage free. Finishes were as expected. The install could be better due to the tie down thread difficulty. The include tray has 4 slots for dividers, only 3 dividers included. Tray has pads on it that facilitate it sliding back & forth while driving which is annoying & damaging.

Goofy question Verified
02/02/2026

Great quality

Not a cheap toolbox (in quality or price). Having several toolboxes on different tricks over the years, this is easily the best built box I’ve had yet. Very sturdy.

Hoppy
11/19/2024

Easy installation, only took a few minuets. This Saddle Box is by far the highest quality

Easy installation, only took a few minuets. This Saddle Box is by far the highest quality tool box of it's type on the market today. I bought a new truck recently and had deceived since I was retired I didn't need a truck box any longer. Wrong! I had bought an under the seat storage compartment for the rear set of the crew cab. Another joke unless all you need is a place to store a winter jacket. So I decided to buy a tool box and so I began to look around and I'm telling you 95% of the boxes on the market today are cheap! and I don't mean price wise. I like my money's worth when I buy. And for my money there's no better box for a 1/2 ton pick-up than the weather guard 121-0-01. You can buy one or a dozen +1 friends you do get what you pay for.

Mandy Verified
01/29/2026

Looks awesome on my rig and is very sturdy, room...

Looks awesome on my rig and is very sturdy, room for everything I need.

AB33437 Verified
01/08/2026

Great Box

Works well for me small but does the job.

John Verified
09/17/2025

Great box after I put shims on the latch catch...

Great box after I put shims on the latch catch so the lid would shut

Mace Verified
04/07/2025

I have had a number of Weatherguard tool boxes over the years, and this one lives up to th

I have had a number of Weatherguard tool boxes over the years, and this one lives up to the standards I’ve come to expect from them. Installation requires no drilling on your truck, which is a big plus. I prefer the matt black finish because it keeps the box from becoming a large reflecting mirror in bright sunlight. I would like to see a system to keep the tool tray from sliding around, but that’s a minor detail that’s easy enough correct yourself. The locking system is also very secure and the aluminum construction, is very lightweight.

austinbldr
10/18/2024

Good Quality Box

I am a superintendent for a home builder, so it was important to me to buy a secure box that would protect my tools from theft and the elements. Riding around with all your tools in the box seat becomes a burden when you actually want to use the seats for passengers. I keep all of my hand tools, power tools, and supplies in the weatherguard box. Sure the Husky and Colbalt boxes have a nice price, but they certainly are not secure and typically have latching issues. You get what you pay for. Weatherguard does an excellent job.

Damian Verified
01/08/2025

Fits great looks fantastic well made the only problem with...

Fits great looks fantastic well made the only problem with the anchor bolts didn’t sit quite flush due to the bed angle. Just have to see how well it lasts but looks fantastic thank you very much

Ihook716
10/01/2025

Doesn’t latch

I recently bought this low profile box. I opted to spend the extra money and get the best quality box. Unfortunately I can’t get it to close and latch properly unless I get in the bed and put all my weight on it. I have yet to find a way to adjust this. It also came with a small dent on the front face. Please help

Greg937 Verified
12/31/2024

Nice Box

I'm very satisfied with the product. I bought a few weeks back and put this on my 2018 Ford F150. I like the size, works well and looks great

Dnye Verified
10/26/2024

Solid box and easy mount

Solid box. Lower profile makes rear truck window easier to see out. The new lock system is a step up from my other boxes.

JRMTZ Verified
07/02/2024

A quality product at the right price

I'm very satisfied with the product. It has all the features I was looking for.

Mh123
09/26/2024

Very Good Tool Box

Well made. The quality is worth the money. I would buy again.

Trouble Verified
06/01/2024

Best Built Box

This is the best built toolbox I have ever owned. Lid opens and closes smoothly and locks securely.

Dale Verified
01/14/2024

Great toolbox

Well built toolbox but worth ever penny keeps tools dry and safe

Aaron Verified
08/21/2026

Good product

Good product. Door feels a little loose when opened all the way. Solid box

WILL Verified
06/24/2026

Updated toolbox from a TSC brand, to accommodate use of a tonneau cover made for truck toolboxes on a 2017 F350 SRW LB. So far, great quality and space. Ordered/delivered to store for pick up - packaging was intact (no dents). Read reviews ahead, and have some thoughts of the provided steel, sliding tray. Does not fit snug, but very loose. If Weatherguard provided a rugged plastic tray - would be a much better accessory.

1up1
08/20/2024

Always a great product from weatherguard

.......... ....

HomeDepotCustomer Verified
02/07/2024

The top seal was not consent in measurements on one of the corners

HomeDepotCustomer Verified
07/10/2025

Perfect tool box and great size for my truck

Perfect tool box and great size for my truck

Kevin57
11/13/2024

Poor quality for the price paid

I bought this toolbox 2 weeks ago. Have opened and closed the box maybe a dozen times. The sheet metal screws holding the latch on the lid all came loose and fell off! I would think for the amount I paid for this product , I would expect a higher level of quality. This is not the first weatherguard I have owned and have always been very satisfied with the quality. It’s sad I had to repair this box after only owning it for 2 weeks. I will add photos of my repairs . I feel this should have been done from the manufacturer, or something more than sheet metal screws.

C Booher Verified
08/28/2026

Awesome!!!

Love this toolbox, compliments on it everywhere i go

Nate Verified
08/22/2026

Way better than by backseat floor board!

Convenient storage

Rob
12/16/2024

Weather guard truck box

Solid box with excellent latches and locks. Struts are strong. Always have problems with other top box struts getting weak. I will see if these hold up, but if they don’t, lifetime warranty! One thing i don’t like, the box lid is difficult to get patched. I have to close the lid and then push with a fair amount of pressure to get it to latch and then the other side doesn’t completely latch. Hoping the seal will lighten up over time.

Garrett Verified
08/20/2026

Waited a long time...

I have waited years before buying a quality toolbox. Difference is amazing, wish I would have spent the money a long time ago. Ended up buying two so I could have one in both work trucks.

Clrcut Verified
08/19/2026

Best box ever

Well built box. Excellent fit

Jman Verified
08/16/2026

Tool box

Love this tool box. Very well built

chas24 Verified
08/12/2026

Truck box

Truck box. Is great. Just had a little issue with it not opening from one side because the rod that worked the latch was too short. I fixed it myself and it works great now

RANDY
08/06/2024

Mounting

The tool box is excellent in quality and craftsmanship. It is just what I wanted. The issue that I had was with the mounting hardware though. The clips did not adequately fit the bed on my GMC

RW fisher Verified
07/31/2026

Sharp toolbox , heavy duty / with nice features

Great toolbox with nice space

Water Tech Verified
07/30/2026

Excellent

Sturdy, closes tight and locks easily. This is the best box and worth every penny.

Jason Verified
07/19/2026

Perfect

Perfect fit. Perfect space. Super easy to install. Very happy.

HomeDepotCustomer Verified
07/13/2026

Love it. Will never buy a cheap toolbox again!

Anonymous
07/14/2026

Matt Black Toolbox

My husband absolutely loves it. He loves the way it appears, locks, is sturdy, and extremely well built.

Scott Verified
07/07/2026

Superb box!

Went to TC to purchase a truck box. So many models out there in the 400+ range, but this one's reputation and quality was obvious. Well built, perfect powder coating and looks awesome on my 3/4 ton truck.

Jonathan Verified
07/07/2026

Tool box

Perfect fit, allows my 5th wheel to go over it when I turn sharply

HomeDepotCustomer Verified
06/27/2026

One of the best truck boxes . Great locking mechanism.

JRK1997 Verified
06/20/2026

Weather Guard Tool Box

This is the best toolbox I have ever owned nice and very sturdy. I also love that it is low profile and the locks and keys are second to none. This has sold me from now on I will only be buying Weather Guard toolboxes for life!

JEFF T
05/28/2026

There's a reason I buy Weather Guard

This is my third Weather Guard toolbox and I can say without a doubt they just keep getting better and better. The construction, the finish, and the locks are the best yet. But the real reason I buy Weather Guard is the phenomenal service I count on and received from Susan in customer care. I called last Thursday with a concern about the anchor points and label on my box, and today (Tuesday) I came home to this package waiting for me just as promised. She was knowledgeable, professional, pleasant and resolved my concern completely and quickly. There's a reason I buy Weather Guard - and her name is Susan. Thank you.

Anonymous
08/13/2025

Weather Guard

Worth the extra money compared to cheaper truck boxes!!

Joel
06/10/2024

Damaged

Product came damaged, otherwise no issues. Not a fan of the new locks. Feel cheap

DANMAN
05/31/2026

Low pro saddle box

Had high hopes for this box and while it isn't terrible, not quite what I expected. For the price point I was expecting a box built like a tank, and this one isn't. Saw other reviewers talk about the welds and, the welds on my box are decent but not spectactular. The lid on the box is different than most, not simetrical, kind of a weird gap in the back, not astheticaly pleasing. Have to set the locks with the key on first use which was unusual. Locks seems to be okay, not the smoothest operating. Release button on driver side seems to be a little glitchy, sometimes works good and other times hesitates, passenger side works fine. The keys are HUGE also, as long as the key fob for my ram and just about as wide. Don't really see the need for the key to be that large when it only inserts in the lock about 1". Thought the box was supposed to have the easy close feature but mine still has to…

Aaron J
04/09/2026

Changed locking mechanism

I bought this box today, I hope it lasts as long as my last one. I bought a dual lid in 2011 and has been awesome, the locking mechanism was what drew me to the product. I'm highly disappointed that Weather Guard changed there lock system. I really hopeful that the new system performs as a deterant like the old system.

Work every day
02/11/2026

It works

Good box not great if you’re looking for old school weather guard this isn’t it but works well just miss old style and quality

steve
09/12/2025

Great tool box

I chose this Weatherguard tool box for the low profile and storage, it is weather tight and great, knocked off a star because the stickers were all of center on the box

Well duh huh Verified
06/18/2026

Locks

The locks our not as good as the ones on my older box weather guard