How do I add a lock to a lateral file cabinet that doesn't have one?

Most commercial lateral file cabinets have a pre-drilled lock channel or a standard cam lock cylinder location — an aftermarket cam lock (available for $5–$25) can often be installed by removing the factory blank and inserting the new cylinder. If your cabinet doesn't have a lock channel, a bar-lock hasp that clamps over all drawer faces is an external locking option. For security-grade filing requirements, it's better to buy a cabinet with a factory-installed bar lock from the start. FindOfficeFurniture.com has locked lateral file options — call 888-719-4960 for the best deals.