Schlage Commercial 01-063-363 Plunger Unit, A85 Non-Orbit Knob, 1-3/8" to 1-7/8" Doors

It covers doors from 1-3/8 to 1-7/8 inches thick, so a 1-3/4 inch door (the standard commercial thickness) is well inside the range. The same range also takes the 1-3/8 inch doors common on older interior openings, and thicker 1-7/8 inch slabs at the top end. Measure the actual door edge rather than assuming, since a door that has been faced or clad can run past 1-7/8 and put you outside what this plunger unit covers.

The 01-063-363 is the plunger unit alone, specified for the A85 non-orbit knob. It is a replacement part, not a complete lockset, so if the knob itself, the rose, or the chassis is what failed, this will not put the door back in service on its own. Order it when the plunger is the piece you have identified as bad and the rest of the lock is sound.

Finish matters. Schlage builds many of these small parts finish specific, and the 01-063-363 plunger unit is supplied in 626 satin chrome, the brushed nickel-toned finish also called US26D. Put a 626 part into a brass or oil-rubbed bronze knob and the mismatch shows on the face of the door, which is exactly what a property manager gets called back about. Check what is on the other doors in the building before you order a batch.

Certified Schlage. The 01-063-363 plunger unit is a genuine Schlage part rather than a generic equivalent, which matters on an institutional or MRO repair where the lock has to stay a factory-original assembly and the parts have to be traceable when the next tech opens it up.

Commercial. The 01-063-363 is part of the Schlage commercial line and is specified for the A85 non-orbit knob, so it is the part for a commercial knob lock on a hollow metal or wood opening in an apartment building, school, or office, not for the residential-grade Schlage knobsets sold for houses. Identify the knob you are repairing before ordering; the two lines do not share this part.