Kwikset KWI-81826 6 Way Adjustable Plain Latch

The 81826 is a plain latch that ships with three interchangeable faceplates: round corner, square corner, and a drive-in collar. Combined with its adjustable backset, that gives you six ways to set it up in one part, so a locksmith or property manager can carry one latch and match round-corner prep, square-corner prep, or a bored hole with no faceplate mortise at all.

Not if you use the drive-in collar. The 81826 comes with a drive-in collar along with round corner and square corner faceplates, so on a new bore with no edge mortise you drive the latch straight into the 1-inch edge bore. If the door already has a mortised faceplate pocket, pick the round or square corner plate that matches the existing cut and the latch drops into the same prep.

Yes. The 81826 includes a round corner faceplate as one of the three supplied plates, so it seats in an existing round-corner mortise. Square-corner prep is covered too. That is the point of the part for anyone maintaining a building where the doors were prepped by different installers over the years, one latch covers all three conditions.

That is what the adjustable latch is for. The two backsets used on residential and light commercial bored doors are 2-3/8 inches and 2-3/4 inches, and an adjustable latch is set to either one at the door rather than stocked as two separate parts. Measure from the door edge to the center of the knob bore to confirm which one you have before you set it.

The Kwikset 81826 is a plain latch, meaning the latchbolt has no auxiliary deadlocking plunger beside it. If the opening needs a deadlocking latch instead, the Corbin Russwin 867F21 is a 2-3/4 inch backset deadlocking latch with a square corner 1-1/8 inch front, built for mechanical lock functions. The practical difference is at the strike: a deadlocking latch carries a secondary plunger that rides the strike lip and blocks the latchbolt from being carded back, while a plain latch does not. Exterior and corridor doors where loiding is a concern are typically specified with the deadlocking version; interior passage and privacy openings commonly use a plain latch. Note also that the 867F21 is a fixed 2-3/4 inch backset with a single square corner front, so it has to match the existing bore and faceplate mortise, whereas the 81826 ships with round corner, square corner, and drive-in collar faceplates in the box.

The Kwikset 81826 is a plain mechanical latch and has no provision for an electrified function. For an electrified lock, the Corbin Russwin 867F32 is a 2-3/4 inch backset deadlocking latch with a square corner 1-1/8 inch front supplied for electrified functions; its mechanical-function counterpart is the 867F21, same 2-3/4 inch backset and same square corner 1-1/8 inch front. Integrators specifying an electric lock body should confirm which of those two the lock schedule calls for, because the front and backset are identical between them and the parts can be told apart only by the function they are built for.

No, they are different parts and go in different bores. The Kwikset 81826 is a spring latch, the beveled bolt driven by the knob or lever that lets the door close on its own. The Codelocks CDL-DBDB is a replacement dual backset deadbolt, a deadbolt function bolt that is thrown by turning a thumbturn or key and does not retract when the door is pushed shut. On a door prepped for both, the latch goes in the lower bore with the lockset and the deadbolt in the upper bore; ordering one to replace the other leaves the wrong bolt in the wrong hole. Property managers standardizing hardware should count the two bores separately when pulling quantities.

The 6-way adjustable plain latch is offered as 81826-001, 81826-003, and 81826-004. The model you pick is the finish variation of the same latch body and faceplate set, so match it to the finish of the knob or lever trim already on the door rather than to the door prep, which all three handle the same way.

Not with the Kwikset 81826. It ships with three interchangeable faceplates, a round corner, a square corner, and a drive-in collar, so one part number covers a door mortised for square corner, one routed for round corner, and one with no faceplate mortise at all where the drive-in collar is used. Fixed-front alternatives are ordered the other way around: the Corbin Russwin 867F21 and 867F32 are each supplied with a square corner 1-1/8 inch front, so the door prep has to match the part before it is ordered. On a mixed fleet of doors where the corner prep varies opening to opening, the difference decides how many distinct part numbers a maintenance shop has to stock.