Sargent 8200 Mortise Lock: Which Function for a School Corridor
Posted by Kent on 23rd Jul 2026
A school corridor door is the meanest test hardware gets. Kids hang on the lever. Custodians prop it with a wedge. It slams a few hundred times a day and gets kicked for sport. If you spec a cylindrical lock for that door you will be back inside a year. What that opening wants is a Sargent 8200 mortise lock, and the only real question is which function.
Read the function code before anything else
The 8200 family is one lock body with a dozen different function codes. The two digits after 82 tell you how the door behaves. Get that wrong and the lock works fine but the door does the wrong thing, and now you own it.
For a corridor you are almost always choosing between two.
8204 is storeroom function. Outside lever is always locked. You need a key to get in, every time, and the door locks itself behind you when it shuts. Inside lever always retracts the latch for free egress. This is the classroom-corridor workhorse. A teacher pulls the door shut and it is locked. Nobody has to remember to lock it, which in a school is the whole point. The 8204-LNL in 26D satin chrome is the one I hand people first.
8205 is office/entry. The outside lever can be left unlocked with a thumbturn or a key, so the room stays open during the day and gets locked at night. Fine for a front office or a workroom. Wrong for a classroom, because the day it matters, somebody left it unlocked. If you want the room to be secure by default, you do not want 8205. The 8205-LNL has its place, but a corridor classroom is not it.
Handing, and the mistake that costs you a return
A mortise lock is handed. Left or right, and whether the door swings toward you or away. Sargent's 8200 field-reversible on most functions, but not all trims are, and the strike and the lever throw have to match the door. Stand at the door, watch which way it opens, and get the hand right on the order. The 26D in 8204-LNL-26D is satin chrome, the finish that hides a school's worth of hand grime better than bright brass ever will. That is not an aesthetic call. It is a maintenance call.
Why mortise and not cylindrical here
A cylindrical lock puts the whole works in a hole bored through the door. A mortise lock sits in a deep pocket routed into the door edge, with a steel case protecting the guts. On an abused door that difference is everything. The mortise case takes the lever-hanging and the door-slamming that snaps a cylindrical spindle. It costs more up front. On a corridor door that gets used ten thousand times a term, it is the cheaper lock over five years, because you install it once.
Common questions
Storeroom or office function for a classroom?
Storeroom (8204). It locks itself so a teacher never has to. Office function (8205) can be left unlocked, which defeats the point.
Is the 8200 field-reversible?
Most functions reverse in the field, but confirm the hand on your specific trim and order it right. Do not assume.
What finish holds up in a school?
26D satin chrome. It hides wear and grime. Bright finishes show every hand that touches them.
Lock Depot stocks the Sargent 8200 in the corridor functions, both common finishes, and the LNL lever trim, in stock and ready to ship. Start at the Sargent hub, or call 877-365-5625 and tell us: classroom or office, which way the door swings, how many openings. We will read you the right function code.