What This Article Covers and Who It Helps
If you are a contractor installing hardware on a multi-family building, an assisted living facility, or a townhome development, or if you are a facility manager reviewing entry door security on a residential-style occupancy, this guide explains how interconnected locksets work, where they are the right choice, and what to confirm before you order one. The goal is to save you a return trip to the job site.
What Is an Interconnected Lockset?
An interconnected lockset combines a bored lever or knob lockset with a deadbolt in a single coordinated unit. The defining feature: when the interior lever or knob is turned to exit, a single motion simultaneously retracts both the latchbolt and the deadbolt. The occupant does not have to fumble with two separate actions to leave the door. From the outside, entry still requires a key, and the deadbolt provides the added security projection of a full throw bolt.
This is distinct from a standard cylindrical lockset paired with a separate deadbolt above it. In that configuration, a resident must turn the lever and thumb-turn independently. The interconnected unit eliminates that second step on the egress side.
Where Interconnected Locksets Are the Right Fit
The single-motion egress feature makes interconnected locks well suited to situations where quick, unobstructed exit matters and where the occupant population may have limited dexterity or be under stress.
- Multi-family residential entry doors -- apartment and condominium unit entry doors where building codes or insurers require a deadbolt but occupant convenience is also a concern.
- Assisted living and senior housing -- residents with limited hand strength benefit from a single lever motion to exit. The 4800LN-series interconnected lock from Accentra (formerly Yale) was specifically positioned for multi-family dwellings and assisted living facilities.
- Townhome and attached-unit developments -- where a builder or general contractor needs a consistent, ADA-compliant entry hardware package across many doors.
- Light commercial applications -- office suites, small retail back-of-house, and similar openings where a deadbolt plus latch combination is required but a full mortise lock is over-specified.
ADA and Accessibility: Why Interconnected Locks Check the Box
ICC A117.1 and ADAAG require that door hardware on accessible routes be operable with one hand without tight grasping, pinching, or twisting of the wrist. A lever-style interconnected lockset meets that standard on the egress (interior) side because a single downward lever motion releases both bolts. Confirm that the specific model you specify carries ADA compliance documentation -- the Accentra 4800LN series, for example, was documented as meeting ADA accessibility guidelines and ANSI 117.1 requirements.
Installation Prep: What Has to Be Right Before You Drill
Interconnected locks require two face bores spaced a set distance apart -- typically 4 inches center to center -- rather than the single 2-1/8-inch bore of a standard cylindrical lock. Getting this wrong means a door that has to be patched or replaced.
- Bore spacing: Most interconnected locksets use a 4-inch center-to-center dimension between the upper (deadbolt) bore and the lower (latch) bore, both at 2-1/8 inches diameter. Always use the manufacturer's hole template -- do not estimate from memory.
- Backset: Interconnected locks are typically available in 2-3/4-inch and 2-3/8-inch backsets. Confirm which backset the door prep requires before ordering. The Accentra 4800LN adjusts between both in the field by sliding the deadbolt latch assembly and holding the tab through the motion -- but you must confirm the tab is fully seated before mounting.
- Door thickness: Standard interconnected locks fit 1-3/8-inch and 1-3/4-inch doors. Confirm thickness before spec.
- Handing: Many interconnected lever designs are field-reversible (inside and outside levers swap), but some designs -- particularly decorative or asymmetric lever styles -- are handed at the factory. Confirm this before the hardware ships.
- Fire-rated openings: If the door is on a fire-rated assembly, confirm that both the latch and any fire cup components are UL-marked. Failure to use a fire cup and UL-marked latch on a rated opening invalidates the UL listing. If you are retrofitting a fire-rated opening, consult the authority having jurisdiction before modifying the prep.
Specifying the Right Function
Interconnected locks are available in a limited set of functions. The most common for residential entry:
- Entry function: Outside lever locked; key unlocks from outside. Inside lever always free and simultaneously retracts both bolts. This is the standard residential entry setup.
- Classroom or office function variations are generally not offered in interconnected form -- that territory belongs to cylindrical or mortise locks. If your opening requires those functions, spec accordingly.
Finish and Grade Considerations
Interconnected locksets for residential entry are typically BHMA Grade 2, appropriate for residential and light commercial use. For a heavier-traffic opening -- a shared corridor entry in a large apartment complex, for example -- evaluate whether a Grade 1 cylindrical or mortise lockset with a separate deadbolt is a better long-term investment. Common finishes include satin nickel (US15/626), satin brass (US4), and oil-rubbed bronze, among others. Coordinate with hinge and closer finishes on the same opening to avoid a mismatched hardware set.
Where to Source Interconnected Locksets
DoorwaysPlus.com carries interconnected locksets suited to residential and light commercial entry applications. If you are specifying a package across multiple units on a development project, our team can help you coordinate hardware sets, confirm backset and bore requirements, and identify finish availability before your order ships. Contact DoorwaysPlus for a project quote or product guidance.