The Schlage ND-Series gets the job done with tough, dependable ANSI Grade 1 locks designed for use in schools, hospitals, offices, retail spaces, and colleges and universities. Built for heavy duty applications, ND-Series locks are easy to service and maintain and offer a wide range of styles and finishes to fit your project needs. All ND levers are reversible and ADA compliant. Exceeds ANSI A156.2, Series 4000 Grade 1 locked lever torque requirements. Tested to at least four times the 800,000-cycle ANSI Grade 1 requirement. Locked lever freely rotates up and down while remaining securely locked. Near-zero droop and wobble beyond 16 million cycles (after 16x BHMA) - without the use of set screws or O-rings. Latch retraction with up to 200 pound preload (4x BHMA) for confident operation in warped and preloaded doors. Cast steel spindle construction exceeding 16 million cycles. Withstood aggressive Schlage development testing including lever-snap and abusive cycling. 31 mechanical functions. 6 wired functions with: Autodetecting 12-24V DC input; Switch-selectable EL/EU operation; Modular request to exit (RX); 0.230A max/0.010A holding current. Available in 10 finishes, 5 lever designs, and 2 rose designs. Multiple key systems available - open, patented, restricted, geographic exclusive, UL437. Support for 10 non-Schlage cylinders including Best, Corbin Russwin, Medeco, Sargent and Yale. No access with minimum 3,100 in-lbs of lever torque (2.6x BHMA, for general abuse), No access with minimum 1,600 lbs of offset lever pull (8x BHMA, for pry-bar attacks), No access with minimum 100 vertical impacts (20x BHMA, for sledgehammer attacks). Often used in institutional, education, healthcare, office, retail.