What is the difference between 4-post and 2-post frame construction in lateral file cabinets?

Budget lateral file cabinets often use a 2-post (or clamshell) construction where the body is formed from two large bent steel pieces — this is lighter and less expensive but can rack or flex under heavy loads. Premium commercial laterals use 4-post construction with a full welded steel frame at all four corners — this is significantly more rigid, better for heavy daily use, and required by BIFMA compliance at the highest load ratings. When in doubt, 4-post construction is the better long-term investment. FindOfficeFurniture.com carries quality commercial-grade lateral file cabinets — call 888-719-4960 for the best deals.