Emtek LC4-DBLTCH Deadbolt Latch

Both, but you pick one when you order. The LC4-DBLTCH is offered as a 2-3/8 inch backset version and a separate 2-3/4 inch version, not as one adjustable latch. Measure from the door edge to the center of the 2-1/8 inch cross bore before ordering: 2-3/8 inches is typical on residential interior and many exterior doors, 2-3/4 inches on thicker or heavier residential doors. Order the wrong one and the tailpiece will not reach the hole.

Standard tubular deadbolt prep: a 2-1/8 inch cross bore through the door face and a 1 inch edge bore into the door edge. That is the same bore pattern most residential deadbolts use, so on a door already drilled for a deadbolt the latch drops into the existing holes as long as the backset matches.

Match whatever is already routed into the door edge. The LC4-DBLTCH latch is sold both ways: square corners for a mortise pocket cut with a chisel, radius corners for a pocket cut with a router or a factory-prepped door. Both come in either backset, so the faceplate choice does not limit your backset. Pull the old latch and look at the mortise before you order.

No. The LC4-DBLTCH is the latch mechanism only, an unkeyed replacement part. It carries a Schlage C keyway, so it accepts a Schlage C cylinder from the Emtek deadbolt it goes into. If your existing deadbolt is on a different keyway, this latch will not suit it.

The Emtek LC4-DBLTCH is a residential tubular deadbolt latch. For an opening that has to carry a fire label, look at the Kwikset UL-rated latches: the 83518 RCAL adjustable square drive UL 3 hour latch, the 83521 RCAL plain latch UL 3 hour for BBL, KNL, CNL and PLL trim, and the 84290 square corner plainlatch with 2-3/8 inch backset, UL. Those three carry the UL 3 hour designation in their descriptions, which is the wording a fire door schedule is looking for.

No, those are different functions and are not interchangeable. The Emtek LC4-DBLTCH is a deadbolt latch, the deadbolt-throwing part of the lock. The Deltana DLE23875 is an entry latch and the Deltana DLP23875 is a passage/privacy latch, both of which are knob or lever latchbolts with a spring-retracted bevel. Putting a passage or entry latch into a deadbolt edge bore leaves the deadbolt with nothing to throw. Match a deadbolt latch to a deadbolt.

The keyway is Schlage C, so a cylinder keyed to an existing Schlage C system will work in the deadbolt this latch serves. That matters if you run a property on one key: Schlage C is the most common residential keyway in North America, and it lets a locksmith key the Emtek deadbolt to the same bitting as the rest of the building. The latch itself is supplied unkeyed.

No handing to specify. A deadbolt bolt is square rather than bevelled, so it works on a left or right hand door, inswing or outswing, with no reversing step. What you do have to specify is backset and faceplate corner shape.

Usually yes, and the LC4-DBLTCH is sold for exactly that: it is a replacement latch, so you keep the existing Emtek cylinder, thumbturn and rose. Take the old latch out, check the backset and whether the mortise corners are square or radiused, and order the matching version. If the cylinder itself is the failure, the latch will not fix it.

Across a building with mixed door thicknesses, one part number covers 1-3/8 inch to 2 inch slabs, so thickness is rarely what splits your order. What does split it is backset, 2-3/8 inch or 2-3/4 inch, and faceplate corner, square or radius. Walk the doors, note those two things per opening, and you can standardize on the same latch and finish throughout.

The Emtek LC4-DBLTCH covers 2-3/8 inch and 2-3/4 inch backsets, but the backset is chosen when the part is ordered, so a stocked LC4-DBLTCH is one backset or the other. Among the comparables, two are adjustable in the field: the Deltana DLP23875 drive-in latch has an adjustable backset of 2-3/8 inch or 2-3/4 inch in a single part for passage and privacy openings, and the Kwikset 83518 RCAL is an adjustable square drive latch. Both change backset at the door rather than at the order line, which is why crews carrying one truck stock часто prefer them for unknown bore centers.

The Emtek LC4-DBLTCH is a faceplate latch and comes with square corner or radius corner faceplates, both of which want a mortised edge. When the edge is drilled but not mortised, a drive-in latch seats directly in the 1 inch edge bore with a round collar instead: the Deltana DLE23875 drive-in latch for entry function and the Deltana DLP23875 drive-in latch for passage and privacy. Note the function difference - those are latchbolts, not deadbolts, so they suit the knob or lever bore rather than the deadbolt bore.