Schlage Commercial 09-509 Thumbturn, L Series Rose Trim, 1-3/8" to 1-7/8" Thick Doors

Yes, and 1-3/4 inches sits mid-range for it. The 09-509 thumbturn is built for doors 1-3/8 to 1-7/8 inches thick, so the one part covers standard 1-3/4 inch commercial doors as well as the 1-3/8 inch interior doors still common in older buildings. There is no separate thickness version to choose between.

Schlage specifies the 09-509 for L Series rose trim, so it is the inside turn piece for an L Series mortise lock dressed with rose (round) trim. If the door carries escutcheon trim rather than a rose, the turn piece for that trim is a different part, so check which trim style is on the door before ordering.

Only the turn piece. The 09-509 is a replacement thumbturn that mounts to Schlage L Series rose trim, not a complete trim set and not a lock body. Order it when the existing turn is broken, worn, or being changed to a different finish and the lock itself is staying in the door.

Eleven finishes, which covers most of what is already hanging in a commercial building: 605 bright brass, 606 satin brass, 612 satin bronze, 613 oil rubbed bronze, 619 satin nickel, 622 matte black, 625 bright chrome, 626 satin chrome, 629 bright stainless steel, 630 satin stainless steel, and 643E aged bronze. Match the BHMA number stamped or specified on the rest of the L Series trim on the opening rather than matching by eye, since 626 satin chrome and 630 satin stainless read almost the same across a corridor.

Finish is the only selection you make. The 09-509 comes in eleven BHMA finishes, and because it is rated across 1-3/8 to 1-7/8 inch doors there is no thickness or handing variant to call out. What you do need to confirm on your end is that the lock is an L Series with rose trim, since that is the trim this turn is made for.

Stainless steel construction, and it is a commercial part rather than a residential one, which is what you want on a turn that gets grabbed every few minutes. On restroom and staff-door privacy openings the thumbturn is usually the first thing to fail on the trim, so replacing just the turn on an L Series lock is the normal repair instead of pulling the whole trim set.

Handing does not come into it. A rose-mounted thumbturn like the 09-509 is non-handed, so the same part serves a left or right hand door. The two things that decide fit are the trim it mounts to, L Series rose, and a door thickness between 1-3/8 and 1-7/8 inches.

No, this is a commercial part. The 09-509 is made for Schlage L Series rose trim, which is mortise lock trim, and residential deadbolts and privacy knobsets use their own turn pieces that are not interchangeable with it. If the door has a mortise lock with a rose and a thumbturn, this is the right family; if it has a tubular residential lock, it is not.