Most filing cabinet and desk lock problems fall into a few categories: a lost key, a lock that will not turn, a drawer that stays stuck even when unlocked, or a key that has broken off in the cylinder. Many of these can be solved without damaging the furniture, often by cutting a new key from the code stamped on the lock or by replacing just the small lock cylinder. This article explains how these locks work, what usually goes wrong, and what can be done about it.

Stuck with a locked cabinet or desk? Call (613) 707-4884.

How Filing Cabinet and Desk Locks Work

Most office furniture uses small, simple locks:

  • Plunger locks are the most common on filing cabinets. You push the cylinder in to lock, and turn the key to release it. The plunger drives a bar inside the cabinet that holds every drawer closed at once.
  • Cam locks are common on desk drawers and storage cupboards. Turning the key rotates a flat metal cam behind the panel to block the drawer or door.
  • Wafer cylinders are used inside many of these locks. They are compact and inexpensive but offer only basic security.

Many furniture locks have a short code stamped on the face of the cylinder or on the key itself. That code often allows a replacement key to be cut without removing the lock.

Common Problems and Their Usual Fixes

Lost key

Check the face of the lock for a stamped code. If there is one, a key can usually be cut to that code. If there is no code, the lock can typically be opened non-destructively by a locksmith, then a key made to fit, or the cylinder replaced.

Key turns but the drawers will not open

Many filing cabinets have an anti-tilt interlock that allows only one drawer to open at a time, so the cabinet does not tip forward. If any drawer is open slightly, the others will stay locked. Push every drawer fully closed and try again. A bent locking bar, a misaligned drawer or something jammed behind a drawer can also cause the problem.

Lock is stiff or will not turn

Dust and worn keys are frequent causes. Try a spare key if you have one, since a worn key may no longer lift the wafers correctly. A small amount of dry graphite or a lubricant made for locks can help; avoid heavy oils, which collect dust.

Plunger will not stay in

This usually means the internal spring or retaining part has failed, or the locking bar has come loose. The cylinder or the mechanism behind it usually needs replacement.

Broken key in the lock

Do not push the fragment further in or apply glue. A broken piece can usually be extracted with the right tools, after which a new key can be cut from the pieces or from the lock code.

Replacing Cabinet and Desk Lock Cylinders

Replacing a furniture lock is usually much simpler than replacing the furniture. Replacement cylinders come in standard sizes and styles, and many can be ordered keyed alike, so one key opens several cabinets or desks. In offices, this is a practical way to give each employee one key for their own furniture, while a supervisor keeps a key that opens everything. Our guide to master key systems explains how that kind of hierarchy works for doors as well.

Security Limits of Furniture Locks

Filing cabinet and desk locks are designed to keep honest people honest, not to stop a determined thief. For confidential records, cash or sensitive equipment, consider a locked room with a better door lock, a security cabinet, or a fire-resistant file cabinet or safe.

What Affects the Cost

The main factors are whether a key can be cut from a code, whether the lock needs to be opened first, the number of cabinets or desks involved, and whether you want new cylinders keyed alike or on a master key.

Your Next Step

Before calling, look for a code on the lock face and note the brand of the cabinet or desk if it is visible; it makes identifying the right key or replacement cylinder easier. To see what we do for offices and businesses, visit our commercial locksmith page or call (613) 707-4884.