How to Pick a Truck Tool Box Lock? | Match the Code, Not the Guess

Picking a replacement lock for your truck tool box isn’t about finding a universal fit — it’s about reading the code on the existing lock cylinder and matching it to the right part. A wrong guess means a key that doesn’t turn, and a return trip to the hardware store. The fastest route is to find that stamped number first.

Where to Find Your Truck Tool Box Lock Code

Every major manufacturer stamps a specific code directly onto the lock face or the cylinder body. That number is your key to the entire replacement process.

For UWS tool boxes, replacement keys are sold by cylinder number. The CH-series keys, such as CH501 and CH507, fit specific UWS tool boxes — the part descriptions distinguish between paddle handle models and Secure Lock boxes. According to UWS, these keys work with the cylinder’s quarter-turn activation.

Weather Guard follows the same system. Their truck bed tool box and tool chest keys are organized by lock number in the K750-K799 range. You’ll find the correct matching number printed on the lock face itself and on any original keys you still have.

If the code is worn down, try a magnifying glass and bright light. As a last resort, unscrew the lock cylinder from the door — the full number is often stamped on the side hidden inside the housing.

Order the Right Replacement: Key vs. Lock Kit

Once you have the code, you have two options. If the lock mechanism still works smoothly, you only need a replacement key cut to that code. If the cylinder is damaged or the key is lost entirely, a lock kit is the safer route.

Dee Zee replacement lock kits come with keys and are designed for paddle handle latches. Installation is straightforward: unscrew the existing lock cylinder from the back of the door, insert the new cylinder with the key turned to the correct alignment position, and reattach the screw nut to secure it.

The critical compatibility check is brand and code matching. A generic key won’t work in a UWS CH-series cylinder any more than a UWS key will fit a Weather Guard K-series lock. Before ordering, confirm the part description explicitly names your box’s brand and lock series.

There’s one more spec to verify: door thickness. Some cam-lock replacement kits specify a maximum door thickness of 0.39 inches (10 mm) with a 5/8-inch thread length. If your toolbox door is thicker than that, the mounting nut won’t reach the threads.

Matching Known UWS and Weather Guard Lock Series

These are the two most common lock families you’ll encounter. Match your code to the correct series before you order.

These ranges are the general guidance — always verify the exact part number against your specific box model before purchasing. It’s worth checking what truck lock box models top the charts if you’re weighing a full replacement against a new key. A new lock box with a standard key system can save you from chasing cylinder codes entirely.

When to Replace the Whole Lock Box

There’s a point where buying a new key or cylinder stops making sense. If the lock is seized from rust, the tumblers are worn, or the door itself is bent, a replacement lock won’t fix the underlying problem.

Most models ship with two keys and a standardized cylinder, and you won’t need to match any codes. For a box that’s seen years of weather, this is often the more reliable choice. For those weighing whether to repair or replace, the decision usually comes down to the box’s overall condition — a single bad lock on a good box is replaceable, but a corroded lock on a beat-up box is a sign to upgrade the whole unit.

FAQs

How do I find the lock code on my truck tool box?

The code is stamped on the lock face or cylinder body. For Weather Guard boxes, look in the K750-K799 range printed on the face. For UWS boxes, check for CH-series numbers. If the face is worn, remove the cylinder to find the full code on its side.

Will any replacement key fit my truck tool box?

No. Replacement keys are cut to match specific cylinder codes, and the systems are brand-specific. A UWS CH-series key won’t work in a Weather Guard K-series lock. Always match the advertised code range to the number stamped on your cylinder.

Can I replace the lock cylinder instead of buying a new key?

Yes, and it’s often the better choice if the original key is lost or the cylinder is damaged. Dee Zee replacement lock kits include keys and install by unscrewing the old cylinder, aligning the new one, and securing it with the screw nut. Check door thickness limits before ordering.