Double Cylinder Deadbolts

Double Cylinder Deadbolts for Entry Doors and Exterior Lock Hardware

Double cylinder deadbolts use keyed cylinders on both the exterior and interior sides of the door. The deadbolt can be extended or retracted with a key from either side, unlike single cylinder deadbolts, which combine an exterior keyed cylinder with an interior thumbturn.

When comparing double cylinder deadbolts, check the backset, latch or bolt configuration, door thickness range, cylinder and keyway, trim dimensions, grade, mounting arrangement, and finish. Residential and commercial models can use different cylinder preparations, strikes, bolt designs, and installation requirements, so replacement hardware should be matched to the existing door preparation and lock family.

Because a double cylinder deadbolt requires a key on the interior side, it can restrict emergency egress if the key is not immediately available. Building, fire, or life-safety requirements may restrict or prohibit keyed interior locking on certain doors. Confirm the requirements that apply to the opening before choosing or installing this type of deadbolt.

Double cylinder deadbolts are available in residential and commercial lock families, including conventional keyed cylinders, manufacturer-specific keyways, interchangeable-core preparations, and coordinated entry hardware. Some are sold as individual deadbolts, while others may be paired with knobs, levers, or handlesets. Always review the individual product specifications to confirm cylinder format, included components, and door compatibility.

Related options include the broader deadbolt selection, one-sided deadbolts, and commercial deadbolts. Compare the locking function and door application first, then confirm fit and keying details before ordering.