Kwikset 84290 Square Corner Plainlatch 2-3/8"Backset UL

That's exactly what the 84290 is cut for. It's a square corner plain latch with a 2-3/8 inch backset, which is the shorter of the two standard residential backsets (the other being 2-3/4 inch). Measure from the door edge to the center of the bore hole: if that comes to 2-3/8 inches, this latch drops in. If it measures 2-3/4, you need the longer backset version instead.

Square corner. The 84290 faceplate measures 1 x 2-1/4 inches with square corners, so it needs a door edge mortised with square corners. If the existing mortise in your door edge is rounded at the top and bottom, this faceplate won't sit flush without recutting the prep, and you want a radius corner latch instead.

Deadbolt. The 84290 is the deadbolt latch, not a spring latch for a knob or lever, so the bolt throws only when you turn the key or thumbturn. Don't order it expecting the beveled self-latching bolt that goes under a passage or entry knob.

The Kwikset 84290 is a square corner plain latch with a 2-3/8 inch backset and a 1 x 2-1/4 inch square corner faceplate, driven mechanically by the deadbolt turn or key. The Emtek LC9-DBLTCH is an EMPowered motorized deadbolt latch, so the bolt is thrown by a motor rather than by hand. If the opening has a standard mechanical Kwikset deadbolt in it, the 84290 is the mechanical latch part; the LC9-DBLTCH belongs to a motorized EMPowered deadbolt and is not a mechanical replacement.

They serve different locks. The Kwikset 84290 is a deadbolt latch with a square corner faceplate at a fixed 2-3/8 inch backset. The Deltana DLP23875 is a drive-in latch with an adjustable backset of 2-3/8 inch or 2-3/4 inch and a passage/privacy function, meaning it is the latch for a non-locking or bed/bath knob or lever, not for a deadbolt. Match the latch to the lock function first: a deadbolt needs a deadbolt latch, and a passage or privacy set needs the passage/privacy latch.

It's a residential-duty part. Kwikset lists the 84290 for residential applications, which covers apartments, single family, and light multi-family unit doors. For a commercial opening with heavy traffic or a spec that calls for graded hardware, this isn't the latch to write into the job.

It is, provided every door is prepped the same way. The thing that varies door to door is the backset and the faceplate corner. The 84290 covers one combination only: 2-3/8 inch backset with a square corner face. Walk a few doors and check both before you buy a case. Buildings that were hung over several years often have a mix of 2-3/8 and 2-3/4 backsets, and square versus radius faceplates, and a latch that's wrong on either count won't install.

Usually just the latch. On a Kwikset deadbolt the cylinder and thumbturn mount through the cross bore and the bolt mechanism is a separate cartridge in the door edge, so a worn or bent bolt assembly comes out on its own. The 84290 is that replacement piece for a 2-3/8 inch backset square corner prep. You keep the existing outside cylinder and inside turn, which also means you keep your existing key, no rekeying needed.

The Kwikset 84290 is a residential deadbolt latch, square corner plain latch style, 2-3/8 inch backset with a 1 x 2-1/4 inch faceplate, in polished chrome, and it is UL rated. Standardizing on it works where the deadbolt preps across the units are 2-3/8 inch with square corner mortises. For the knob or lever bores on the same doors, the Deltana DLE23875 handles entry and the DLP23875 handles passage and privacy, both adjustable to 2-3/8 inch or 2-3/4 inch so one part number covers mixed preps.

No. Both have square corners, but the Kwikset 84290 is a complete square corner plain latch with a 1 x 2-1/4 inch faceplate at a 2-3/8 inch backset for a deadbolt. The Emtek 83228 is a faceplate and screws only, for a tubular pocket door privacy latch in a privacy/bed/bath function - it is a replacement plate for a pocket door latch body, not a latch and not a deadbolt part. Square corner prep in the door edge is the shared trait; the function and the part itself are different.

Polished chrome, and that's the only finish it's built in. The latch body sits inside the door edge where nobody sees it, so the finish only matters on the 1 x 2-1/4 inch faceplate showing at the edge. If your door edge hardware is brass or satin nickel, the chrome plate will read differently when the door is open.

No. The 84290 is a mechanical deadbolt latch with no motor and no wiring. For a powered application, the Emtek LC9-DBLTCH is an EMPowered motorized deadbolt latch built for that job.