What This Article Covers
This guide explains what interconnected locksets are, how they differ from standard bored locksets and separate deadbolts, and when specifying one makes sense for residential entry doors, light commercial thresholds, multi-family units, and assisted living facilities. Whether you are a contractor prepping a door schedule, a property manager evaluating a security upgrade, or a builder finishing a spec home, the information below will help you make the right product call before the door gets prepped.
What Is an Interconnected Lockset?
An interconnected lockset combines a bored key-in-lever (or key-in-knob) lockset with a deadbolt in a single integrated unit. The critical mechanical feature: a single interior handle or lever retracts both the latchbolt and the deadbolt at the same time. From the outside, the door operates normally with a key. From the inside, one motion releases both bolts, which means no fumbling with a separate thumbturn under pressure.
Per the architectural hardware fundamentals used in the industry, the interconnected lock fits the bored-lock family (two 2-1/8-inch holes spaced 4 inches center to center) and is classified in the BHMA Series 2000 range alongside other bored products. It is distinct from a mortise lockset, which integrates all components into a single pocket in the door edge, and from an auxiliary deadbolt added independently above a separate latch.
How the Mechanism Works in Practice
From the exterior, the cylinder controls both bolts independently, the same way a conventional deadbolt does. From the interior, the lever or handle is mechanically connected to both the latch mechanism and the deadbolt cam. Turning or depressing the interior lever retracts both bolts simultaneously in one motion. This is the defining functional advantage.
Installation requires two 2-1/8-inch face bore holes at 4-inch centers, making it compatible with most new and replacement residential door preps. Backset is typically 2-3/4 inch, though 2-3/8 inch is available on many models for older door prep situations. Both 1-3/8-inch and 1-3/4-inch door thicknesses are commonly supported.
Where Interconnected Locksets Belong
Residential Entry and Front Doors
The most straightforward application. A deadbolt provides meaningful resistance to kick-in or forced entry at an exterior door. Pairing it with the latch in one unit eliminates the need for occupants to engage a separate thumbturn each time they leave. This matters most in high-traffic household situations: families with children, short-term rental units, and any entry door that sees repeated daily use.
Multi-Family and Apartment Unit Entry Doors
In multi-family residential construction, the interconnected lockset is a common specification for individual unit entry doors. It provides a deadbolt-level security standard while giving residents a simple, single-motion exit. ADA compliance is achievable with lever-style trim that meets the one-hand, no-tight-grasping, no-twisting standard required for accessible routes. Many models in this category meet ADA and ANSI A117.1 lever operability requirements.
Assisted Living and Senior Housing Facilities
The single-motion interior exit function is particularly valuable where residents may have limited dexterity or reduced fine motor control. An interconnected lockset on a resident room entry door eliminates the need to locate and turn a separate deadbolt thumbturn in an emergency, improving both life safety and day-to-day usability. These projects typically require ADA-compliant lever trim and Grade 2 minimum hardware.
Light Commercial and Office Entry
Small office suites, medical office suite entry doors, and similar light commercial applications sometimes benefit from an interconnected format where a mortise lockset would be oversized for the budget or door construction. Verify with the authority having jurisdiction that the door and frame assembly meets any applicable fire or egress requirements before specifying an interconnected unit in a rated opening.
Interconnected vs. Separate Deadbolt: Key Differences
- Single-motion egress: The interconnected unit retracts both bolts with one handle action; a separate deadbolt always requires a second step to retract before exit.
- Door prep: The interconnected unit uses a two-bore, 4-inch center-to-center prep; a standard separate deadbolt adds a third bore above the latch at a different vertical spacing.
- Aesthetics: One trim escutcheon plate and two cylinders (or one cylinder, one thumbturn) versus two completely separate hardware units at different heights on the door face.
- Replacement and rekeying: Because the cylinder of an interconnected lockset controls both bolts, rekeying a unit entry door in a master-key system can be done in a single cylinder rather than two separate cylinders.
Specifying the Right Interconnected Lockset
Grade
For residential and assisted living applications, Grade 2 is the standard entry point and meets most residential building code thresholds. Grade 1 may be specified on unit entry doors in mid-rise or larger multi-family projects where code or the owner's standard requires it. Confirm BHMA/ANSI grade with the hardware schedule before ordering.
Handing
Some lever designs are field-reversible; others require handing to be specified at the time of order. Confirm door hand before placing the order. When in doubt, note the hand on the project schedule and verify against the frame before the door ships.
Backset
Most interconnected locksets support 2-3/4-inch backset standard and 2-3/8-inch as an option. Adjustable backset models allow the installer to set backset in the field by sliding the latch assembly before installation. Confirm the backset to the existing prep or template before ordering replacement units.
Cylinder and Keying
Interconnected locksets accept a mortise cylinder or a proprietary plug depending on the product line. For multi-family projects with a master key system, confirm cylinder compatibility with the key system being used before specifying. The interior side typically uses a thumbturn or a connecting lever depending on the function selected.
Finish
Common ANSI/BHMA finishes include satin nickel (US15), bright brass (US3/605), antique brass, satin chrome, and oil-rubbed bronze. Coordinate with the hinge finish and any exterior door hardware to maintain a consistent appearance at the entry.
A Note on Fire-Rated Openings
If the residential entry door is fire-rated (common in attached garage applications and corridor doors in multi-family construction), the hardware assembly must be UL listed for use on the rated opening. Confirm that the specific lockset model carries the appropriate listing and that a UL-marked latch is included. Failure to use fire-rated components in a rated opening assembly voids the listing of the door itself. When in doubt, consult the authority having jurisdiction before specifying.
Where DoorwaysPlus Fits In
DoorwaysPlus.com stocks and sources interconnected locksets suited for residential entry, multi-family unit doors, and assisted living applications. Preferred lines in this category include Accentra (formerly Yale) and Corbin Russwin, both of which offer stable product lines with consistent part availability and straightforward rekeying paths. If you are upgrading an existing prep or need to match a specific backset or lever style, our team can help you cross-reference and confirm compatibility before you order.
Contact DoorwaysPlus for project quantities, hardware schedule review, or a quote on interconnected locksets for your next residential or light commercial project.