How to Install a Lock in a Metal Filing Cabinet

Installing a lock in a metal filing cabinet is a great way to secure important documents and valuables. With some basic tools and materials, this project can be completed in just a few steps.

Introduction

Metal filing cabinets are ubiquitous in offices and homes. While they conveniently store files, paperwork, and other items, most standard filing cabinets lack any type of locking mechanism. This leaves the cabinet contents accessible to anyone, making sensitive documents vulnerable. Installing a lock is an easy DIY solution to keep your filing cabinet and its contents protected.

A lock can be added to virtually any type of metal filing cabinet. The most common locks used are:

• Cam locks – These are cylindrical shaped locks installed into a hole drilled into the filing cabinet. A cam lever rotates to secure the lock.
• Disc tumbler locks – Popular keyed barrel locks similar to those used on door knobs. They have a cylinder which the key inserts into.
• Combination locks – Locks opened by inputting a numeric combination. No key is required.

The installation process involves drilling holes into the cabinet rails to mount the lock. Then the lock mechanism attaches to help secure the drawers shut.

Installing filing cabinet locks only requires a few tools and hardware items readily available at hardware stores. With some careful measurement and drilling, the project can be completed in an hour or two.

What You’ll Need

Before starting, ensure you have the necessary tools and supplies on hand:

• Tape measure
• Electric drill with drill bits
• Hammer
• Lock template (optional)
• Lock mechanism of your choice
• Lock installation hardware (often provided with lock)

How to Install the Lock

Follow these simple steps to successfully install a lock in your metal filing cabinets:

Step 1: Select Installation Location

Decide where on the filing cabinet to install the lock. Most locks are placed at the front top or side of a drawer. Measure and mark the precise drill location with a pencil.

Having a template can help position the lock’s mounting holes accurately. If the lock did not come with a template, make one by tracing the lock’s outline onto cardboard then cut it out.

Step 2: Drill Holes

Using a drill bit sized for the lock screws or bolts, drill holes into the cabinet at the marked locations. Drilling into metal creates sharp edges so be cautious. Wear eye protection.

Go slowly and carefully to avoid drill bit slipping. Use a center punch on the marks to keep the bit steady.

Step 3: Install Lock Mechanism

Following the lock manufacturer instructions, insert any provided sleeves or nuts into the drilled holes to thread the screws into.

Position the lock over the holes and use a screwdriver or drill to screw into place. For cam or combination locks, ensure the dial or button faces outward when installed.

Step 4: Check Drawer Clearance

Test that the lock mechanism does not obstruct the drawer sliding open and closed. If needed, loosen the screws and adjust the lock position slightly.

Step 5: Attach Striker Plate

The striker plate gives the locking lever, cam, or bolt something to grab onto. Mark and drill holes for the striker plate screws on the stationary cabinet frame or inside the drawer.

With the drawer closed, ensure the striker plate aligns properly with the lock mechanism before screwing it into place.

Once installed, test locking and unlocking the cabinet drawer several times. Make any needed adjustments. Also be sure to save any provided keys in a safe location.

Tips for Installation

• When selecting a lock, get one made specifically for filing cabinets. Office supply stores have many options designed to fit standard cabinet dimensions.
• Use a lock that matches the same style key of other locks in the office or home. Installing ones all opened by the same key is more convenient.
• Placement at the top center or side of a drawer provides the most security. If multiple locks are desired, put one on each drawer.
• Use sturdy metal striker plates at least 1 inch wide and 3 inches long. Larger cabinets may require heavier duty striker plates.
• Be extremely careful when drilling metal to avoid cords and hands. Take safety precautions and work slowly.

Installing a lock requires precision but it is a manageable DIY project for most people. Follow the instructions closely and with some patience you will have a secured filing cabinet. Consider adding locks to other cabinetry containing valuables as well. A few simple locks can go a long way in protecting your most important possessions and documents.

Frequently Asked Questions About Installing Filing Cabinet Locks

What type of lock is best for a filing cabinet?

Cam, combination, and disc tumbler (keyed) locks are all suitable options. Cam locks are affordable and easy to install making them a popular choice. Keyed locks provide convenience of using the same key for multiple cabinets.

Where is the best location to install a filing cabinet lock?

The front top or side area of a drawer is ideal so the lock mechanism can engage with the striker plate when shut. Make sure the placement allows full drawer clearance.

How do I know what size drill bit to use?

Consult the lock’s documentation for the recommended drill bit size. Common sizes are 3/16 inch for cam locks and 1/2 inch for tumbler/keyed locks. Measure screw holes on the lock itself to help determine the proper bit.

Should I drill a hole or punch an indent for the drill bit?

Indenting with an awl or center punch first makes drilling into metal easier by keeping the bit steady and preventing walking. But a hole can be drilled directly depending on the metal thickness.

What can I do if my cabinet drawer won’t close all the way after installing the lock?

First check that the lock lines up with the striker plate correctly. If not, loosen the lock screws and adjust its positioning as needed. Filing down the edge of the drawer rail may help if it is scraping on the lock body.

How can I find a replacement key for my filing cabinet lock?

Take the lock to a locksmith and they can match it to a replacement key using the key’s bitting code. You can also contact the manufacturer with details on the lock model and they may be able to provide a replacement.

I lost the keys to my filing cabinet. What should I do?

A locksmith can drill out the old lock and replace it with a new one so you regain access. Some locks have manufacturer override codes available which a locksmith can also utilize to unlock it for you.

Conclusion

Installing a lock on a metal filing cabinet is straightforward DIY project to improve security. Follow the steps to carefully measure, drill holes, and mount the lock mechanism. With a few basic tools and some patience during installation, you can add reliable locking functionality. Be sure to keep any keys or combinations in a safe place for access. A locked filing cabinet deters thieves and unauthorized access, providing peace of mind your private documents and valuables are protected.