Allegion/Schlage ND Series Grade 1 Cylindrical Lock

The ND Series heavy-duty cylindrical lock is able to handle any application and is one of Schlage’s best-selling mechanical locks.

ND Series offers a full breadth of commercial lock options with a suited combination of mechanical, electrified and electronic options. This page focuses on mechanical and electrified lock information, NDE wireless electronic lock and ND Series ligature-resistant HSLR trim information are available on a separate web pages.

Beyond grade 1 performance is the hallmark of the mechanical and electrified locks. ND Series locks are tested to withstand 3,100 in-lb. of abusive lever torque – more than 2 1/2 times the Grade 1 standard requirement. Offset lever pull testing up to 1,600 lbs. assures you of the lock’s superb resistance against pry bar attacks. More than strong, ND Series is built to last and shows nearly zero droop or wobble after 16 million cycles.

All ND Series locks including electronic and ligature-resistant trim use the common cylindrical ANSI 161 door preparation making them easily interchangeable. They are ideal for all new construction and retrofit applications.