Weather Guard 121 Aluminum Crossover Truck Tool Box, Full-Size Low-Profile, Matte Black (121-52-04)

$1,340.00 Regular price $1,504.99 Save $164.99
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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 121-52-04 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.

Will the matte black finish fade or stain in the weather?

No. The textured matte black ARMOR TUF coating is built to resist UV fading and corrosion, and the full-perimeter D-shaped weather seal keeps rain and dust out. Its low-sheen texture also helps hide water spots and road grime between washes.

Is the matte black finish good at hiding marks?

Yes. The textured matte black ARMOR TUF coating is designed to diffuse light, so fingerprints, dust and minor scuffs are far less visible than on a bright or gloss finish. It gives the box a durable, low-maintenance stealth look.

What is it made of and how big is it?

It is built from welded aluminum diamond plate with a textured matte 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
C Booher Verified
08/28/2026

Awesome!!!

Love this toolbox, compliments on it everywhere i go

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.

Dons Verified
06/06/2026

Soldier box

Excellent tool box, it's not as "low profile" as I was expecting. The top lid of the box has weird water drain ports for the weather seals that feed right into the side trays inside the box which hasn't been a problem, only time I noticed it was during washing of the vehicle with pressure.

Joel
06/10/2024

Damaged

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

James Dugener Verified
04/14/2026

Good truck box

Excellent construction fit perfect, and looks nice

HomeDepotCustomer Verified
03/08/2026

Great tool box. Shipped as advertised and arrives on...

Great tool box. Shipped as advertised and arrives on time in good condition

RJ Thomas Verified
08/22/2025

Good, solid tool box

This is a good looking, well-built tool box with excellent latches. I have no complaints with the construction or the finish. I did not like the J-latches provided and used proper bolts through drilled holes to secure the box. The tool tray is free to move and will swap sides when rounding corners. A bungie cord stops that, at least for now.

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.

Tom Northern Michigan Verified
05/29/2025

Weather Guard the only truck box to buy

Thanks again TSC for letting me return the other truck tool box, I picked up my new Weather Guard cross bed tool and immediately noticed the difference in quality, overall the box is much heavier, the lid is rigid so it doesn’t flex when closing it from one side of the truck. The latches catch every time and stay latched even on the worst wash board roads. I’ve always had Weather Guard boxes but bulked at the cost and bought a cheaper one first, what a mistake. It’s true you get what you pay for.

Dr Hackenbush
11/06/2025

Third time was a charm

After 2 attempts from big box dealers, Finally WW Grainger came through with a perfect box. This box is more than expected in quality. Will last my lifetime.

Mark Verified
12/20/2024

Wonderful product sturdy and easy to use. Keep...

Wonderful product sturdy and easy to use. Keep stools rust free safe and dry Not an easy toolbox to dent or scratch.

Drewbee Verified
11/29/2024

Great tool box.

I bought this aluminum weather guard a little while ago. Super easy install. For how light weight it is, it is really strong. It sits on my 2016 tundra. Looks great.

HomeDepotCustomer Verified
11/27/2024

This is a solid, well-constructed truck toolbox that should last a very long time.

Charles Verified
11/02/2024

Very happy with this truck tool box. Seems to be...

Very happy with this truck tool box. Seems to be well constructed and very secure.

JUNIOR -SA
09/14/2024

Great feature especially the new locking mechanism

Very pleased with product and craftsmanship quality, easy install.

Local Shopper Verified
09/16/2024

great tool box and great price

great tool box and great price

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

Syd H Verified
07/27/2024

Tool box

Best tool box I have ever owned. A little pricey but worth every dime.

Satisfied TSC Customer Verified
06/24/2024

Nice Box

Really nice box. I really like how this box sits on my bed. Not too big. My junk fits in there snug. I'd buy it again.

Grace Pogue Verified
06/17/2024

Nice Truck Box

This truck box was a good price. It fit my truck well and was easy to install. Lots of room for tools, etc.

Tberry05
07/11/2024

Best tool box on the market

I bought this tool box expecting the same thin construction as the previous aluminum tool boxes that I've purchased in the past. I was pleasantly surprised that this tool box is much heavier and built very well. It may be a little more that the typical truck tool box but it is very much worth it. I am very happy with this purchase.

WILLIAM Verified
04/16/2024

These are well built and last a long time. Just wish they were a little cheaper. Thanks,

Greg Verified
02/17/2024

A box worth installing

Sturdy, easy to install, high quality!

Well duh huh Verified
06/18/2026

Locks

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

Brad Verified
08/31/2024

This is an excellent product. Mine however showed up...

This is an excellent product. Mine however showed up with 2 dents from a forklift, which I didn't notice until after install (evening install).

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…

RON Verified
01/17/2024

This is my third set of Weather guard boxes, I’d say they hold up better than others. Are they worth the money? I would say so if you’re planning on keeping them for a while.

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.

Nate Verified
08/22/2026

Way better than by backseat floor board!

Convenient storage

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.

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

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.

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

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.

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

B fuller Verified
08/04/2026

Weatherguard

Fits well on 2500 ram truck

RW fisher Verified
07/31/2026

Sharp toolbox , heavy duty / with nice features

Great toolbox with nice space

Jose Verified
07/13/2026

Toolbox for work

Also, experience employees are excellent with service

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.

HomeDepotCustomer Verified
07/13/2026

Love it. Will never buy a cheap toolbox again!

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.

Anonymous
08/13/2025

Weather Guard

Worth the extra money compared to cheaper truck boxes!!

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.

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

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.

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

Aaron Verified
08/21/2026

Good product

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