Commercial Lock Types Compared
The right lock depends on the door, the traffic, and who needs to get through.
| Hardware | Best for | Watch for |
| Cylindrical lever lock | Offices, restrooms, storage rooms | Choose Grade 1 on busy doors |
| Mortise lock | Main entries and older buildings | New lock must fit the pocket |
| Storefront deadlock | Aluminum and glass entries | Little room for the lock body |
| Exit device | Required exits in assembly and school spaces | Code rules on trim and dogging |
| Door closer | Any door that must latch on its own | Speed settings drift over time |
On busy doors, ask for Grade 1. BHMA's A156.2 standard tests a Grade 1 lever lock to 1,000,000 cycles, and A156.13 holds Grade 1 mortise locks to the same million cycles plus 15 security tests.
The 2010 ADA Standards call for door hardware 34 to 48 inches above the floor that works with one hand, without tight grasping, pinching, or twisting of the wrist. That is why levers replaced knobs on most business doors. Closers must allow at least 5 seconds to swing from 90 degrees open to 12 degrees from the latch.
Sources: BHMA Hardware Highlights, A156.2-2022 and A156.13-2022; U.S. Access Board, 2010 ADA Standards 309.4, 404.2.7, and 404.2.8.1.