Weather Guard 121 Aluminum Crossover Truck Tool Box, Full-Size Low-Profile, Bright Aluminum (121-0-04)

$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 121-0-04 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.

How does the bright aluminum hold up outdoors?

Very well. The aluminum body will not rust like steel, and the clear ARMOR TUF coating plus the full-perimeter D-shaped weather seal keep water, salt and dust out while protecting the finish. A rinse and a wipe keep the diamond plate bright.

Does the clear aluminum finish need much upkeep?

Not really. The clear ARMOR TUF powder coat seals the aluminum, so it will not rust like bare steel and it wipes clean with mild soap and water. The bright diamond plate hides light scuffs well and keeps its look with basic care.

What is it made of and how big is it?

It is built from welded aluminum diamond plate with a clear ARMOR TUF powder coat over bright aluminum diamond plate. 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
Nate Verified
08/22/2026

Way better than by backseat floor board!

Convenient storage

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

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.

WAYNE
04/23/2026

Excellent box, well worth the price!...

Excellent box, well worth the price!

HomeDepotCustomer Verified
06/27/2026

One of the best truck boxes . Great locking mechanism.

James BC Verified
01/26/2026

What can I say, #1 it's a Weather Guard.

Weather Guard is the best box out there. This light gray box fits and looks great on my truck. The locking system opens on each side. Actually, my truck is a GMC AT4 metallic gray with the red hooks on the front. So you know this Weather Guard saddle box looks great.

James Verified
10/21/2025

The entire process was trouble free....

The entire process was trouble free.

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 Verified
09/02/2025

Tool box came quickly. It was packaged well, and fit like it should.

B2Garcia
08/10/2024

Happy Happy Happy!!!

This truck box is awesome and the glossy black powder coat finish is top of the line! Fit perfect on my 14' F150 King Ranch, easy install took about 30 minutes all hardware was included! The dual gas shocks inside help pop the lid open a full 90°, comes with 2 keys, a sliding tray and 2 hooks to hold a 4' level. Very sturdy for an aluminum box. All my stuff fit very well, It's definitely worth the money! I get nothing but good compliments over it!

J South Verified
07/28/2025

Weather Guard toolbox

Very well made, a quality product. The textured black matte finish matches the spray in liner in my truck.

Eric Verified
05/11/2025

Great toolbox

I've had this box almost a month and use it often. It locks and unlocks easily, opens and closes easily, and has plenty of room. The tie down on the back of the box allows me to secure my pack-out boxes for secure transport.

Robeert Verified
05/08/2025

Nice box, heavy duty....

Nice box, heavy duty.

Nb Verified
04/26/2025

Great product would purchase again

Great product would purchase again

Frogdog1947
07/08/2024

Weather guard

This is a great looking box and I love it functions, my opinion is that it the best tuck Box in the world and it rate as a(5) star.

HomeDepotCustomer Verified
04/19/2025

Box was actually gloss black not matte. But the gloss...

Box was actually gloss black not matte. But the gloss is what the weather guard product number indicated. Great box!

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

JohnnieD Verified
01/18/2025

Looks and works great!

Bought this box a few weeks ago and it looks and works great! Quality construction and simple to install.

tganglin Verified
12/26/2024

Awesome

Fantastic tool box!

Hoss Verified
09/07/2024

Truck tool box for F250

Great assistance and help

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.

MjMof Verified
09/04/2024

Weather guard toolbox--amazing!

I recently purchased this toolbox to have a more secure and tougher box for my tools, and all I can say is wow. Best tool box hands down I've seen/purchased. Extremely pleased with weather guard and their product! Would highly recommend this box. Pricey, but you get what you pay for and these are built to last.

Hoofing4P2 Verified
07/14/2024

Tool box

Great box for my F150

Roger Verified
06/02/2024

Good Solid Toolbox

Solid toolbox best that i have had.

LEWIS Verified
04/17/2024

Fit fine. Great quality

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.

BobG Verified
01/25/2024

Nice truck box

Great truck box. I can fit a ton of stuff in it. Looks good too!

Consumer 1000pp Verified
05/16/2026

Weather or not

Price point is definitely of premium quality. Box is not poorly made but at that price I expect more

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.

HomeDepotCustomer Verified
03/28/2026

Good toolbox, but not as well made as they used...

Good toolbox, but not as well made as they used to be. Thinner metal, no dividers for tray, no rubber piece to put between the toolbox and bedrails.

Anonymous Hippopotamus Verified
02/28/2026

Weather Guard toolbox

The locks are different. Not properly functioning when purchased. Not bad, just not Weather Guard standard that I’m used to.

Anonymous
08/13/2025

Weather Guard

Worth the extra money compared to cheaper truck boxes!!

DANIEL Verified
02/28/2024

Would have given a 5 star but, the driver side lock had to be replaced. Great box other than that. Sturdy

C Booher Verified
08/28/2026

Awesome!!!

Love this toolbox, compliments on it everywhere i go

HomeDepotCustomer Verified
07/10/2025

Perfect tool box and great size for my truck

Perfect tool box and great size for my truck

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.

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.

Jman Verified
08/16/2026

Tool box

Love this tool box. Very well built

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.

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

Dhoff
12/16/2025

Great tool box

I have owned 6 weather gaurd boxes over the years, the quality is always great. Sure they are expensive but you get what you pay for. Everything else is a cheap toy that constantly has issues. I don’t get paid to screw with my tool box all day. Pay the money and it hurts for a day, get a cheap toy and pay every day!

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.

Jose Verified
07/13/2026

Toolbox for work

Also, experience employees are excellent with service

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

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