Emtek LC4-PASDV Drive-in Latch, Passage Function

The LC4-PASDV drops into a standard 2-1/8 inch cross bore and adjusts between a 2-3/8 inch and a 2-3/4 inch backset, which are the two backsets used on residential doors. Backset is also an order choice, so you pick 2-3/8 or 2-3/4 when you buy rather than sorting it out at the door.

Passage only. It is a non-keyed tubular latch with a passage function, so it suits knobs and levers that turn freely from both sides with no locking. For a keyed entry opening you need an entry latch instead, such as the Deltana DLE23875 adjustable drive-in entry latch.

This is a residential-rated latch, so it is not the part for a rated opening. If a fire door is what you are prepping, the Kwikset 84290 square corner plain latch is a UL latch with a 2-3/8 inch backset, and the Kwikset 83521 RCAL plain latch is a UL 3 hour latch.

The closest equivalent is the Deltana DLP23875, a drive-in latch with an adjustable 2-3/8 inch or 2-3/4 inch backset for passage and privacy function. That matches the LC4-PASDV, which is a passage-function drive-in latch with the same adjustable 2-3/8 inch or 2-3/4 inch backset. The difference a contractor will care about is the door: the Emtek latch is specified for 1-3/8 inch to 1-3/4 inch doors, while the Deltana DLP23875 covers 1-3/8 inch to 2 inch. On a thicker slab, the Deltana is the one that reaches.

Use the Deltana DLE23875, an adjustable drive-in latch built for entry function. The Emtek LC4-PASDV is a passage latch and is non-keyed, so it is the wrong latch behind a keyed entry knob. The DLE23875 fits doors 1-3/8 inch to 2 inch thick. Match the latch function to the trim function or the knob will not operate correctly.

For a fire rated opening, look at the Kwikset 83521 RCAL plain latch, which is UL 3 hour and fits Kwikset BBL, KNL, CNL and PLL trim, or the Kwikset 83518 RCAL adjustable square drive UL 3 hour latch. The Emtek LC4-PASDV is a brass passage latch specified for residential use. Institutional and MRO buyers writing to a fire door schedule should be ordering the UL rated Kwikset parts and the trim they are listed with.

A drive-in latch has a round collar on the nose instead of a flat faceplate with screws, so it taps straight into the edge bore with no mortising and no faceplate routing. That is what makes it the fix for a door edge that was never prepped for a rectangular faceplate, or one where the old mortise is chewed up. The LC4-PASDV is sold as a replacement part, so it is the latch by itself, not a complete knob or lever set.

Two nose bolt finishes, brass and chrome, and both are available at either the 2-3/8 or 2-3/4 backset. The nose collar is the only part visible on the door edge when the door is open, so match it to the trim you are installing rather than to the door. The latch body is brass.

Both. The latch faceplate comes round corner or square corner, which means one part number covers doors prepped either way, and it is worth knowing on a building where the door prep is not consistent from unit to unit.

Yes, if you buy the Deltana DLP23875, which is specified for passage and privacy function on one part, with an adjustable 2-3/8 inch or 2-3/4 inch backset. The Emtek LC4-PASDV is a passage-function latch. For a property manager stocking a single latch across hall doors and bath or bedroom doors, the dual-function Deltana keeps it to one line item; if the Emtek trim is already on the doors, the LC4-PASDV is the matching Emtek part.

They are not interchangeable on the same order line. The Kwikset 84290 is a square corner plainlatch fixed at a 2-3/8 inch backset, so it only suits a 2-3/8 inch bore-to-edge dimension. The Emtek LC4-PASDV is adjustable to 2-3/8 inch or 2-3/4 inch, which is what lets one part cover both common backsets. Measure from the door edge to the center of the 2-1/8 inch cross bore before deciding; at 2-3/4 inch, the Kwikset will not reach.

The Kwikset 84290 is a square corner plainlatch at a 2-3/8 inch backset, and the Kwikset 83518 is an adjustable square drive latch. Both are square corner parts, so they suit a mortised square prep in the door edge. The Emtek LC4-PASDV is offered with a round or square corner latch faceplate, which is the useful one when you are retrofitting doors that were prepped differently across a building and you do not want to chisel corners.

No wiring at all. It is a mechanical tubular latch with no electronic component, so nothing about it changes when the power drops.