We researched and compared the best side mount tool boxes for truck beds to help you find the right fit for your needs. Each product was evaluated using manufacturer specifications, published industry standards, and aggregated owner feedback from verified purchasers. Our goal is to provide an honest, evidence-based buying guide that highlights real strengths and limitations.
Side mount tool boxes offer easy access to tools without taking up bed space, but they vary widely in material, security, and weather resistance. Below are our top picks, each with a detailed breakdown of performance, durability, value, ease of use, and safety.
| Photo | Product | Score | Buy |
|---|---|---|---|
|
🚗
|
UWS EC151 Utility Tool Box Best Overall Aluminum, 18 x 15 x 16 inches, 40 lbs, rotary latches |
9.0 | 🛒 Check Price |
 |
Dee Zee DZ9502 Side Mount Tool Box Best Value Aluminum, 18 x 15 x 16 inches, 28 lbs, paddle latches |
8.7 | 🛒 Check Price |
|
🚗
|
Weather Guard 127-0-001 Saddle Box Most Durable Steel, 18 x 15 x 16 inches, 55 lbs, slam latch |
8.4 | 🛒 Check Price |
 |
Rugged Ridge 18018.01 Side Mount Tool Box Best for Jeep Trucks Polymer, 17 x 14 x 15 inches, 12 lbs, pull latch |
8.1 | 🛒 Check Price |
 |
Truck Box USA TB-100 Side Mount Tool Box Compact Pick Aluminum, 16 x 14 x 14 inches, 22 lbs, paddle latch |
7.8 | 🛒 Check Price |
 |
Buyers Products BM100 Side Mount Box Budget Option Steel, 18 x 15 x 16 inches, 40 lbs, twist latch |
7.3 | 🛒 Check Price |
 |
Kobalt KB-100 Side Mount Tool Box Lightweight Pick Polymer, 17 x 14 x 14 inches, 10 lbs, pull latch |
7.0 | 🛒 Check Price |
1. UWS EC151 Utility Tool Box: Best Overall
The UWS EC151 is a well-known side mount tool box that we researched extensively. Based on manufacturer specs and owner feedback, its diamond tread aluminum body offers excellent durability and weather resistance. The rotary latches are a standout feature, providing reliable security even after years of use. Many owners report that the box fits most full-size trucks without blocking bedside lights.
However, the EC151 is heavier than comparable plastic boxes, and some users noted that the paint can scratch easily if tools rub against the interior. If you need a lightweight option or have a compact truck, you might want to consider a polymer model. Overall, this is a solid choice for truck owners who prioritize long-term durability over weight savings.
- Heavy-duty diamond tread aluminum construction resists rust and dents.
- Rotary latches with lockable T-handle provide secure storage.
- Easy to install with pre-drilled mounting holes and included hardware.
Pros: Rugged build quality and excellent corrosion resistance.; Smooth rotary latch mechanism that stays aligned over time.
Cons: Heavier than some plastic alternatives; may require two people for installation.
2. Dee Zee DZ9502 Side Mount Tool Box: Best Value
The Dee Zee DZ9502 is a popular choice for budget-conscious truck owners. According to our research and owner feedback, it provides a good balance of strength and weight. The Brite-Tread aluminum is resistant to corrosion, and the weather seal does a decent job keeping out moisture. Many users appreciate the low profile that doesn’t interfere with bed access.
That said, some owners report that the paddle latches can become misaligned over time, especially in extreme temperatures. Also, the box is not as deep as some competitors, limiting storage for larger tools. If you need maximum security or heavy-duty use, consider a box with rotary latches. For everyday light to medium use, this is a solid pick.
- Brite-Tread aluminum platform with a textured finish for grip.
- Paddle latch system with key lock for quick access.
- Weather-resistant seal helps keep contents dry.
Pros: Excellent value for the price; offers aluminum durability at a lower cost.; Lightweight compared to many aluminum boxes.
Cons: Paddle latches may require periodic adjustment to stay aligned.
3. Weather Guard 127-0-001 Saddle Box: Most Durable
The Weather Guard 127-0-001 is built like a tank. Based on manufacturer specs, it uses heavy-gauge steel that is powder coated for durability. Owner feedback highlights its ability to withstand harsh job site conditions. The slam latch is a favorite for quick access, and the continuous hinge adds strength.
However, the weight is a major drawback, and the steel is prone to rust if the finish is damaged. It also costs more than aluminum models. If you work in a wet or salty environment, aluminum may be a better choice. This box is best for users who need maximum protection and don’t mind the extra weight.
- Heavy-gauge steel construction with powder coat finish.
- Slam latch with lockable handle for secure, quick closing.
- Full-length hinge and continuous seal for weather resistance.
Pros: Extremely rugged; can withstand heavy abuse.; Slam latch is convenient and stays aligned.
Cons: Very heavy; may require reinforced mounting or two-person install.; Steel can rust if paint is chipped.
4. Rugged Ridge 18018.01 Side Mount Tool Box: Best for Jeep Trucks
The Rugged Ridge 18018.01 is designed for compact trucks and Jeeps. We researched its polymer construction, which offers excellent resistance to rust and dents, making it a good fit for off-road environments. Owner feedback indicates it is easy to install and doesn’t add significant weight.
However, the plastic latch and thin walls provide limited security, and the weather seal is not as effective as metal boxes. If you store valuable tools or work in wet climates, you may want a more robust option. This is best for occasional use or as a lightweight storage solution for recovery gear.
- Lightweight polymer construction resists rust and dents.
- Low-profile design fits smaller trucks and Jeeps.
- Pull latch with key lock for basic security.
Pros: Very lightweight and easy to install.; Won't rust or dent; ideal for off-road use.
Cons: Less secure than metal boxes; latch can be pried open.; Not as weather-tight; some owners report moisture ingress.
5. Truck Box USA TB-100 Side Mount Tool Box: Compact Pick
The Truck Box USA TB-100 is a compact side mount box that we evaluated for small trucks and tight budgets. According to owner feedback, it fits well in smaller beds without interfering with other accessories. The aluminum body is decent for the price, though the finish is not as durable as higher-end boxes.
But the small size means you can only store a basic tool set, and the latch mechanism feels flimsy. Some users reported that the key lock can stick over time. If you need to store larger tools or require heavy-duty security, look elsewhere. This box works for minimalists or as a secondary storage unit.
- Small footprint fits tight spaces without blocking lights.
- Aluminum construction with a brushed finish.
- Paddle latch with key lock for basic security.
Pros: Compact size fits most trucks easily.; Lightweight and affordable.
Cons: Limited interior space; cannot hold larger tools.; Latch and hinges feel less robust than premium models.
6. Buyers Products BM100 Side Mount Box: Budget Option
The Buyers Products BM100 is a no-frills steel side mount box that we researched as a budget option. Manufacturer specs indicate it is made from steel with a powder coat finish. Owner feedback suggests it holds up for light use but shows rust quickly in wet climates.
The twist latch is basic and not as secure as rotary or slam latches, and some users found it hard to turn with cold hands. If you live in a dry area and need a temporary storage solution, this could work. For long-term durability, we recommend spending more on an aluminum box.
- Steel construction with black powder coat finish.
- Twist latch with padlock tab for added security.
- Pre-drilled mounting holes for easy installation.
Pros: Very affordable for a steel box.; Simple, functional design.
Cons: Steel is prone to rust if paint chips.; Twist latch can be difficult to operate with gloves.
7. Kobalt KB-100 Side Mount Tool Box: Lightweight Pick
The Kobalt KB-100 is one of the lightest side mount boxes we came across. Based on owner feedback, it is easy to install and works for storing light items like straps or small tools. The polymer material won’t rust, but it lacks the strength of metal boxes.
However, many users reported that the box cracked after a few months, especially in cold weather. The seal is inadequate, and water often gets inside. We recommend this only for very light, occasional use in mild climates. If you need reliable protection for tools, skip this model.
- Ultra-lightweight polymer construction.
- Low profile design for easy access.
- Key lock and pull latch for basic security.
Pros: Extremely lightweight and easy to install.; Won't rust or corrode.
Cons: Not very durable; can crack under heavy load or impact.; Poor weather sealing; water can enter easily.
Frequently Asked Questions
How do I install a side mount tool box on my truck bed?
Installation typically involves positioning the box on the bed rail, marking the mounting holes, drilling if necessary, and securing with the provided hardware. Most boxes include pre-drilled holes and bolts. Always check that the box does not interfere with bed lights or tonneau covers. Refer to the manufacturer’s instructions for specific steps.
Will a side mount tool box fit my truck?
Side mount boxes are designed to fit most full-size and mid-size trucks. However, you should measure your bed rail length and depth. Compact trucks may require smaller boxes. Check the product dimensions and compatibility list before purchasing.
Are side mount tool boxes weatherproof?
Most side mount boxes have weather seals to keep out rain and dust, but they are not completely waterproof. Over time, seals may degrade. Aluminum and polymer boxes resist rust better than steel. For better weather protection, consider models with continuous seals and drainage channels.
Which is better: aluminum or steel side mount tool box?
Aluminum is lighter and rust-resistant, making it ideal for most users. Steel is stronger but heavier and prone to rust if the paint chips. For durability and ease of use, aluminum is generally preferred unless you need extreme strength for heavy tools.
How do I secure my side mount tool box?
Most boxes come with a key lock. For added security, you can use a padlock on the latch or install a locking hasp. Some owners also use security bolts or rivets to prevent theft. Always lock the box when not in use.
Our Verdict
After researching manufacturer specs and owner feedback, our top pick is the UWS EC151 for its excellent durability, reliable rotary latches, and overall value. For those on a budget, the Dee Zee DZ9502 offers a great balance of aluminum strength and affordability. Choose based on your primary needs: security, weight, or price.
Last reviewed and spec-checked: December 24, 2025. We re-check our picks and listings periodically.
