Emtek LC4-DLB Key In Latch

The LC4-DLB is ordered as a fixed backset, not adjustable, so you pick one: 2-3/8 inch or 2-3/4 inch. Measure from the door edge to the center of the 2-1/8 inch cross bore and order to match. Most residential interior doors run 2-3/8 inch and most exterior doors 2-3/4 inch, but measure rather than assume. If you would rather not commit, the Deltana DLE23875 drive-in latch is adjustable between 2-3/8 and 2-3/4 inch.

It is purely the shape of the latch faceplate mortised into the door edge, and it has to match the pocket already routed in your door. Radius corners are the rounded ones a router template cuts; square corners are the sharp-cornered plate a chiseled mortise takes. The LC4-DLB comes both ways, so match what is in the door rather than re-chiseling the edge.

Yes, this is the replacement latch itself, not a complete lockset. It is the key-in latch that goes behind an Emtek keyed knob or lever, and Emtek sells it as a replacement part. You get the latch only, so the knob, rose, cylinder, and strike stay as they are. To order correctly you specify three things: backset (2-3/8 or 2-3/4 inch), faceplate corner (radius or square), and finish.

The LC4-DLB is a key in latch, built for a keyed lockset. For a non-keyed opening, the Deltana DLP23875 is the drive-in latch in the Passage/Privacy function, with an adjustable backset of 2-3/8 inch or 2-3/4 inch and a 1-3/8 inch to 2 inch door thickness range. Match the latch function to the lockset function, not just the backset - a passage or privacy trim will not drive a key in latch correctly.

For a fire rated opening, look at the Kwikset RCAL line. The Kwikset 83521 is a plain latch carrying a UL 3 hour rating and is intended for the BBL, KNL, CNL and PLL trims, and the Kwikset 83518 is the adjustable square drive version, also UL 3 hour. The Kwikset 84290 is a square corner plainlatch at a fixed 2-3/8 inch backset with a UL rating. Note that all three are plain latches - the Emtek LC4-DLB is a key in latch, so it is not an interchangeable swap where the trim is keyed.

The Deltana DLE23875 is the nearest cross-brand equivalent for a keyed opening. It is a drive-in latch in the Entry function, with an adjustable backset covering 2-3/8 inch and 2-3/4 inch, and it fits doors 1-3/8 inch to 2 inch thick. The Emtek LC4-DLB key in latch covers the same two backsets, but as separate ordering choices rather than one adjustable body: you pick 2-3/8 inch or 2-3/4 inch up front, along with a Radius Corners or Square Corners faceplate.

It is a residential-duty part. Emtek catalogs the LC4-DLB on the residential side of its line, so for apartment interiors, single-family, or light multi-family unit doors it is in its element. For a commercial opening that has to hold up to public traffic, look at a commercial-grade cylindrical latch instead.

No, and that is the substitution that most often comes back. A plain latch such as the Kwikset 84290 square corner plainlatch or the Kwikset 83521 plain latch is driven by the trim without a cylinder passing through it. The Emtek LC4-DLB is a key in latch, made to work with a keyed lockset. The two can share a backset and still not be interchangeable, so confirm the function before ordering off backset alone.

An adjustable-backset latch covers both cases from one part number. The Deltana DLE23875 for entry openings and the Deltana DLP23875 for passage and privacy openings are both adjustable across 2-3/8 inch and 2-3/4 inch, and both fit 1-3/8 inch to 2 inch doors. The Kwikset 83518 is likewise the adjustable square drive latch in that line. The Emtek LC4-DLB is ordered to a specific backset, 2-3/8 inch or 2-3/4 inch, so measure from the door edge to the center of the bore before ordering it.

It does if you want to reuse the existing mortise in the door edge. The Emtek LC4-DLB key in latch is ordered with either Radius Corners or Square Corners on the faceplate, so a square corner prep can be matched directly. Among the alternatives, the Kwikset 84290 is a square corner plainlatch at a 2-3/8 inch backset. A radius faceplate dropped into a square mortise leaves gaps at the corners, and a square faceplate will not seat in a routed radius prep without chiseling.

The LC4-DLB key in latch is a residential part, made of brass with a steel substrate and offered with a radius or square corner faceplate. For an opening where the specification calls for a rated latch, the Kwikset 83518 and 83521 are the UL 3 hour options, and the Kwikset 84290 carries a UL rating at a 2-3/8 inch backset. Confirm what the drawing or the facility code requires before substituting either direction.

The latch body and mechanism are steel; the description calls out brass for the visible faceplate. That is normal construction for a key-in-knob latch, steel where the load is and brass where you see it.

No, the LC4-DLB is the latch alone. Emtek sells it as a replacement part, so the strike, knob or lever trim, and cylinder are all separate. If your existing strike is in good shape and the backset is unchanged, you reuse it.

The Emtek LC4-DLB key in latch is offered across twelve finishes, including Flat Black (US19), Oil Rubbed Bronze (US10B), Satin Nickel (US15), Polished Chrome (US26), Polished Brass - Lifetime (US3), Unlacquered Brass (US3NL), Satin Brass (US4), Polished Nickel (US14), Pewter (US15A), French Antique (US7), Medium Bronze (MB) and Tumbled White Bronze (TWB), so a visible faceplate can be brought in line with the lockset. The Deltana DLE23875 and DLP23875 and the Kwikset RCAL latches are specified by function and backset rather than by a finish selection, which matters most where the faceplate sits in a door edge that shows.

It is a mechanical latch with no electronics. Nothing to wire, no power, no connection to an access control system. If you are building an electrified opening you need an electric latch retraction or strike, not this part.