Schlage 2-3/4" Backset, 1" Housing Diameter, Square corner, 1-1/8" x 2-1/4"

Measure from the edge of the door to the center of the bore hole. Those two are the only backsets in normal use: 2-3/4 inch is the common one on commercial openings, 2-3/8 inch turns up on older and interior residential doors. Get it wrong and the latch will not line up with the strike. If you measure 2-3/8 inch, the Deltana G1RLE238 is a Grade 1 entry latch at that backset and the G1RLP238 is the passage/privacy version of it; the same pair in 2-3/4 inch is the G1RLE275 and the G1RLP275.

Six finishes, given in the standard BHMA numbers you will already see on your existing trim: 605 bright brass, 606 satin brass, 612 satin bronze, 613 oil rubbed bronze, 625 bright chrome and 626 satin chrome. Order by the number rather than the name, because brass and bronze read very differently from one maker to the next. Most commercial trim is 626 satin chrome, so that is the one to standardize on unless the building was specified otherwise. Once the door is shut, the faceplate on the door edge is all that shows, so match it to the strike rather than worrying about the rest of the opening.

Stainless steel, and it is a commercial part rather than a residential one. Stainless is what you want on a door edge that sees weather, wash-down or coastal air, since it will not rust out the way a plated steel latch does on an exterior opening.

Stay with the brand on latch swaps. The latch and the lock chassis are matched by the manufacturer, so a Schlage latch belongs in Schlage trim. If the lever you are servicing is a Dexter C1000, order the Dexter deadlatch made for the C1000 series instead. Mixing brands is the usual reason a latch will not seat in the chassis or will not retract fully when the lever turns.

The adjustable backset sits on the Lockey M230, but know what that part is before you order it. The M230 is a complete mechanical keyless digital combination lock with a deadlocking spring latch, sized for doors 1-1/8 to 2 inches thick, not a bare latch you can drop into a lever you already own. If you are only replacing a latch, measure the backset off the door and buy the fixed one that matches.

No. A sidelite takes a latch built for that panel, not a door latch. What you want there is the Accentra YSSL10 security sidelite auxiliary latch, which comes with an ADA compliant thumbturn, suits a 1-3/4 inch panel and is listed with a fire rating.

Certified Schlage parts, in stainless steel, sold as replacement latches for commercial locks. For anyone maintaining a building full of Schlage cylindrical hardware, that is what keeps the chassis original instead of putting an unbranded latch into it.

The nearest match on another brand is the Deltana G1RLE275, a Grade 1 regular latch with an entry function at 2-3/4 inch backset. The difference is what each one is bought for: the Schlage 2-3/4 inch backset latch is a stainless steel replacement part that goes back into the Schlage lock already hanging in the door, while the G1RLE275 is a Deltana latch specified with Deltana trim. Check the faceplate size and corner style against the existing door prep before you commit to either, since a latch that matches on backset can still miss on the face.

Match the latch to the function of the lock, not just the backset. The Deltana G1RLP275 is a Grade 1 regular latch in a passage/privacy function at 2-3/4 inch backset, which is the pairing for a non-keyed door; the Deltana G1RLE275 is the same Grade 1 regular latch at 2-3/4 inch backset in an entry function, for an opening that is keyed. Both share the 2-3/4 inch backset of the Schlage commercial latch, so the decision comes down to how the door is meant to operate.

The Deltana Grade 1 regular latch line spans that mix in four part numbers: G1RLE238 (entry, 2-3/8 inch backset), G1RLE275 (entry, 2-3/4 inch backset), G1RLP238 (passage/privacy, 2-3/8 inch backset) and G1RLP275 (passage/privacy, 2-3/4 inch backset), all Grade 1. Stocking by that grid means one grade and one series across the facility, with the only variables being backset and function. Where a Schlage lockset is staying in the door, the Schlage 2-3/4 inch backset commercial latch is the brand-matched stock item for those specific openings.