Emtek LC4-PRIV M Standard Latch, Privacy Function

Both. The LC4-PRIV M is an adjustable latch that sets to either 2-3/8 or 2-3/4 inch backset, and it's ordered by backset as well, so pick the one that matches your existing bore. Measure from the door edge to the center of the 2-1/8 inch cross bore: that distance is your backset, and 2-3/8 and 2-3/4 are the two standard residential dimensions.

Privacy means bed and bath function: the LC4-PRIV M works with a thumbturn or push button inside and an emergency release outside, not a key. It's a non-keyed latch. If you need a latch that takes a keyed cylinder for an exterior or office door, this isn't it, look at an entry function latch such as the Deltana DLE23875.

It's a replacement latch only, the tubular latch mechanism that goes through the door edge into the cross bore. There's no knob, lever, rose or trim with it. Order it when the latch has failed or when the backset on the door doesn't match the one that came in the box, and reuse the existing Emtek privacy knob or lever on the door.

It's a residential latch, brass bodied, for interior bed and bath openings. For a labeled opening where a fire rated latch is required, use one that carries the listing on its own, such as the Kwikset 83521 RCAL plain latch, which is UL 3 hour, or the Kwikset 84290 square corner plain latch in 2-3/8 inch backset.

Not the Emtek LC4-PRIV M, which tops out at 1-3/4 inches. The Deltana DLP23875 drive-in latch is passage/privacy function with an adjustable 2-3/8 or 2-3/4 inch backset and a stated door thickness range of 1-3/8 to 2 inches, so it covers the thicker slab.

The Deltana DLP23875 is the nearest match. It is an adjustable backset latch set for 2-3/8 inch or 2-3/4 inch, the same two backsets the Emtek LC4-PRIV M covers, and Deltana lists its function as Passage/Privacy, which lines up with the LC4-PRIV M privacy/bed/bath function. The difference to check before you order is the body: the Deltana is a drive-in latch, so it seats in the bore without a faceplate screwed to the door edge, while the Emtek latch uses a faceplate available in round or square corner. If the door edge is already mortised for a faceplate, the Emtek matches the existing prep; if the edge is unmortised, the drive-in seats without cutting.

Use an entry-function latch. The Emtek LC4-PRIV M is built for privacy/bed/bath service and is non-keyed, so it is the wrong body for a keyed opening. The Deltana DLE23875 is listed as an Entry function drive-in latch with an adjustable backset, which is the function a keyed knob or lever needs. Function is the one thing on a latch you cannot adjust in the field, so match it before backset or finish.

The Emtek LC4-PRIV M is dimensioned for doors 1-3/8 inch through 1-3/4 inch. For a heavier slab, the Deltana DLP23875 carries a door thickness range of 1-3/8 inch to 2 inch on the same Passage/Privacy function, so it reaches the thicker leaf without changing what the latch does. Measure the actual slab at the bore rather than assuming nominal, and confirm the spindle and rose hardware on the knob or lever set covers the same thickness before you commit.

The LC4-PRIV M latch faceplate handles both, round corner or square corner, so it can go into an existing mortise in the door edge either way. That matters on a replacement: if the old latch left a radius-corner pocket, you don't have to re-chisel it square.

The LC4-PRIV M uses a faceplate that sits in a mortise on the door edge, round or square corner, and screws to it. A drive-in latch like the Deltana DLP23875 has no faceplate at all: it presses into a bored hole in the edge, which is faster on a new slab but leaves nothing to cover an existing mortise. If the door already has a mortised pocket cut for a faceplate, take the LC4-PRIV M.

Not handed. Tubular latches like this one have a bevelled latch bolt you flip to suit the swing, so one part covers both left and right hand doors. On the strike, keep the backset setting matched to your bore, 2-3/8 or 2-3/4, and the latch lines up with the existing strike in the jamb, since the strike position is set by the cross bore centerline, not by the latch.

Treat it as a separate part, not a swap. The Kwikset 83521 RCAL plain latch is specified for Kwikset BBL, KNL, CNL and PLL bodies, and a plain latch is the passage style with no privacy stop or hold-back, which is not what a privacy knob or lever drives. The Emtek LC4-PRIV M is the privacy/bed/bath latch built for Emtek tubular hardware, with an adjustable 2-3/8 inch or 2-3/4 inch backset and a 2-1/8 inch cross bore. Latch tailpiece and drive geometry vary by manufacturer, so stay within the brand of the knob or lever you are servicing.

Two different jobs. The Kwikset 84290 is a square corner plain latch at a fixed 2-3/8 inch backset, carrying a UL marking, and plain latch means passage duty with no privacy function. The Emtek LC4-PRIV M is a privacy/bed/bath latch in brass, adjustable between 2-3/8 inch and 2-3/4 inch backset, with a faceplate offered in round or square corner so it follows whichever prep the door edge already has. Pick the Emtek when a bed or bath door needs to hold locked from inside; pick a plain latch when the door only needs to stay shut.

It comes down to what varies across the doors. The Emtek LC4-PRIV M covers privacy/bed/bath openings on residential tubular hardware, adjusts between 2-3/8 inch and 2-3/4 inch backset, and comes with a round or square corner faceplate plus a brass or chrome nose bolt, so one part number absorbs mixed preps and matches either trim tone. The Deltana line splits by function across two part numbers, the DLP23875 for Passage/Privacy and the DLE23875 for Entry, both drive-in and both rated for doors 1-3/8 inch to 2 inch. If your buildings mix keyed and non-keyed doors, you are stocking two Deltana numbers either way; if the doors are all bed and bath and already mortised for faceplates, the single Emtek number carries the whole fleet.

Two, brass and chrome, and either is available with a 2-3/8 or 2-3/4 inch backset. Match the nose bolt to the latch bolt visible on the door edge of your other openings so a single replaced door doesn't stand out against the rest.

No. It's a mechanical tubular latch, non-electronic and non-keyed. Nothing to wire, no batteries, and it keeps working through a power outage, which is the point on a bathroom or bedroom door.