Technical Foundation
What Is a Lockset Latche?
The latch is the spring-loaded bolt assembly inside a door lockset that extends into the strike plate on the door frame to hold the door closed, retracting when the handle or lever is turned. Passage and privacy latches use a simple beveled latch bolt with no locking function beyond holding the door shut; entry locksets add a deadlatch — a secondary plunger alongside the main latch bolt that, once the door is closed, blocks the latch from being retracted by shimming or credit-card manipulation from the frame side.
Backset — the horizontal distance from the door's edge to the center of the bore hole — is the critical compatibility dimension, most commonly 2-3/8 inch or 2-3/4 inch in North American residential doors, with many replacement latches now made adjustable to fit either. Mortise latches, used with mortise locksets set into a pocket cut in the door edge rather than a bored cylindrical hole, are a distinct mechanism entirely and not interchangeable with bored (cylindrical) lockset latches.
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| Spec | What It Means | Why It Matters |
|---|---|---|
| Backset | Commonly 2-3/8" or 2-3/4" (adjustable versions available) | Must match the door's existing bore hole spacing or the latch won't align with the strike |
| Latch Type | Passage/privacy (single bolt) vs. entry deadlatch | Deadlatches resist manipulation from the frame side once the door is closed; passage latches do not |
| Lock Mechanism | Bored (cylindrical) vs. mortise | Bored and mortise latches use entirely different door prep and are not interchangeable |
| Door Thickness Compatibility | Standard 1-3/8" to 1-3/4" doors | Latch and strike must be rated for the actual door and frame thickness for correct engagement |
| Faceplate Shape | Square corner vs. round corner | Must match the mortise cut in the door edge or the faceplate won't sit flush |
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Applications
Where Lockset Latches Get Used
Lockset latches are replaced anywhere a door's existing latch has worn, broken or needs upgrading, without necessarily replacing the entire lockset or door prep.
Residential Interior Door Repair
Replacing worn or broken passage and privacy latches on bedroom, bathroom and closet doors.
Entry Door Security Upgrades
Upgrading to deadlatch-equipped entry latches for improved resistance to frame-side manipulation.
Commercial & Institutional Doors
Mortise latch replacement on commercial-grade doors using mortise lockset systems.
Property Management & Turnover
Standardized latch and strike replacement across rental units during tenant turnover.
New Construction & Door Hanging
Installing matched latch and strike sets during new door hardware installation.
Historic & Renovation Work
Sourcing period-appropriate mortise latches for older doors retaining original mortise lock pockets.
FAQ
Lockset Latches Questions, Answered
How do I measure backset to order the right latch?
Measure horizontally from the edge of the door to the center of the existing bore hole (where the doorknob or lever spindle passes through) — most residential doors use 2-3/8 inch or 2-3/4 inch backset. Many replacement latches are now made adjustable, sliding to fit either measurement, which avoids needing to identify the exact original spec.
What's the difference between a passage latch and a deadlatch?
A passage or privacy latch has just the beveled latch bolt held by spring tension, with no resistance to someone shimming it back from the frame side with a thin tool. A deadlatch adds a secondary plunger next to the main latch bolt that, once the door closes and the plunger is depressed by the strike plate, mechanically blocks the latch bolt from being retracted by manipulation — a security feature standard on entry-door locksets.
Can I replace a mortise lock latch with a standard bored latch?
No — mortise latches are built for a rectangular pocket mortised into the door edge and use an entirely different mechanism and faceplate than bored (cylindrical) latches, which fit into a round bore hole. Replacing one system with the other requires re-prepping the door itself, not just swapping the latch, so always match replacement latches to the existing lock type.
Why doesn't my new latch align with the existing strike plate?
This is usually a backset or latch-throw mismatch — if the new latch has a different backset than the original, the bolt will land in a different spot on the frame than the existing strike plate opening. Confirm the backset matches exactly, or use an adjustable-backset latch, and check that the strike plate's opening size matches the latch bolt's dimensions.
What faceplate shape do I need — square or round corner?
This depends on how the mortise pocket in the door edge was originally cut: a router-cut mortise typically has round corners, while a chisel-cut mortise typically has square corners. Most latches ship with a faceplate that can be filed or swapped to match either, but check the existing mortise shape before ordering to avoid a visible gap around a mismatched faceplate.
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