How deep are the drawers in a standard vertical file cabinet?

Standard vertical file cabinet drawers are approximately 25"–26.5" deep internally, which accommodates standard letter-size hanging folders (legal folders require the wider legal-size cabinet). The drawer depth allows files to be indexed front-to-back alphabetically. This is the key difference from lateral files, which are 15"–20" deep and index side-to-side or front-to-back. OfficeFurniture2go.com — call 1-800-460-0858 for sizing details.