Middle Atlantic SR-40-32 This Middle Atlantic SR Series Pivoting Rack SR-40-32 is a 40U rack designed for 19 inches wide equipment that pivots on its floor base for easy access to equipment. It features the trademarked Tool-Free Quick-Mount system, which allows for easy mounting of the center section to the backpan on the job site. Its welded-steel construction supports up to 500 lb. and adjustable 1/8 inches, 10-32 threaded front rackrails make positioning your equipment a snap (rear rackrails are optional). This rack offers unsurpassed cable management features. Abundant, built-in cable lacing points and touch-fastener tie points allow you to organize any quantity of cables. And numerous knockouts on the top, bottom, and back offer numerous pass through points for cabling.