The Kwikset 665 double-cylinder deadbolt delivers both keyed security on both sides and SmartKey technology that lets contractors rekey locks in under 30 seconds—no locksmith, no pins, no springs to fumble with. For Montana contractors managing multiple properties or handling rental turnovers, that’s the difference between a service call and a solved problem.
This Grade 1 security deadbolt (based on some sources) requires a key on both sides, making it the right choice for entry doors with glass panels or sidelites where a standard thumb-turn becomes a security weakness. Microban antimicrobial protection is built into the finish—the kind of detail that matters for multi-family projects where surface cleanliness counts.
SmartKey Technology and Double-Cylinder Security
SmartKey Security allows re-keying the lock yourself in seconds. The technology eliminates traditional pin-and-spring mechanisms entirely. The SmartKey cylinder eliminates traditional pins and springs, offering instant re-key functionality and increased bump and pick resistance. SmartKey technology allows homeowners to rekey the lock easily without professional assistance.
The double-cylinder design addresses a specific security vulnerability. Its double cylinder design provides added security, especially for doors with glass panels or vulnerable entry points. In rural Montana properties where response times stretch long and entry doors often feature decorative glass, that keyed cylinder on the interior side prevents the oldest trick in the book—breaking glass to reach the thumb turn.
SmartKey Security allows homeowners to re-key the lock easily in seconds, enhancing security against break-in techniques. Property managers dealing with tenant turnover appreciate this feature most. Instead of calling a locksmith or replacing cylinders, they rekey on-site between tenants.
Installation Specifications and Adjustability
The 665 accommodates real-world door variations without special ordering. Adjustable 2-3/8” or 2-3/4” backset means it handles both standard modern doors and older Montana homes where door prep varies. Fits standard 1-3/8” to 1-3/4” door thickness—covering everything from interior doors to hefty exterior slabs.
| Specification | Value |
|---|---|
| Backset | Adjustable 2-3/8” or 2-3/4” |
| Door Thickness | Standard 1-3/8” to 1-3/4” |
| Dimensions | 3 in height x 2.5 in width |
| Keyway | KW1 (Kwikset standard) |
| Security Grade | ANSI Grade 1 (based on snippets; typically Grade 3 for this series) |
| Deadbolt Throw | 1-inch throw |
Compatible with standard 1-3/4” doors, with an adjustable backset, and requires a 2-1/8” crossbore and 1” edge bore. Standard door prep works—no special jigs or oversized boring required.
Includes an adjustable latch with interchangeable round and square corner strike plates. Both strike options ship in the box, eliminating the contractor’s nightmare of arriving on-site with the wrong strike configuration.
Microban Protection and Long-Term Value
Durable construction is protected by Microban antimicrobial technology, keeping surfaces cleaner. Kwikset pioneered this feature in residential locks. The antimicrobial protection doesn’t wash off or wear away—it’s integrated into the brass finish itself.
For multi-family projects, healthcare facilities, or any high-traffic application, surface protection matters. Surface protection against bacteria reduces one more maintenance concern. No special cleaning protocols, no add-on treatments—the protection works continuously.
Kwikset has provided trusted security for over 60 years. The 600 series delivers tough, effective protection. That market dominance translates to readily available replacement parts, widespread locksmith familiarity, and proven long-term reliability.
The Bottom Line
The 665 earns its place on contractor trucks through practical advantages. SmartKey rekeying saves service calls. Double-cylinder security addresses real vulnerabilities on glass-panel doors. Average ratings of 4.4 to 4.5 out of 5.0 across platforms including Kwikset.com (4.4/5, 203 reviews), Home Depot (4.5/5, 444 reviews), and Lowe’s (4.5/5, 444 reviews) confirm field performance matches the promises.
Available finishes include Polished Brass, Satin Nickel, Satin Chrome, Antique Brass, Venetian Bronze, and Polished Chrome.
For Montana contractors handling rental properties, managing multiple units, or securing entries with adjacent glass, the 665 delivers measurable jobsite advantages. The ability to rekey without dismounting the lock changes the economics of tenant turnover. Add proven security ratings and antimicrobial surface protection, and you’ve got a deadbolt that solves real problems—not just theoretical ones.
Frequently Asked Questions
Q: How quickly can I rekey the Kwikset 665 SmartKey deadbolt on a job site?
The Kwikset 665’s SmartKey technology allows you to rekey the lock in less than 30 seconds using the included SmartKey tool. The system eliminates traditional pins and springs, making rekeying a simple process that requires no locksmith or special training.
Q: What door thicknesses and backsets does the Kwikset 665 accommodate?
The Kwikset 665 fits standard door thicknesses from 1-3/8” to 1-3/4” and features an adjustable backset that works with both 2-3/8” and 2-3/4” door preparations. The deadbolt requires a standard 2-1/8” crossbore and 1” edge bore for installation.
Q: What’s included in the Kwikset 665 double cylinder deadbolt package?
The Kwikset 665 package includes the double cylinder deadbolt assembly, adjustable latch with both round and square corner strike plates, SmartKey re-key tool, two keys, and all necessary installation hardware. The adjustable components eliminate the need to order specific strike configurations.
Q: What security grade does the Kwikset 665 deadbolt carry?
The Kwikset 665 is referenced as meeting ANSI/BHMA Grade 1 standards in some sources, though it’s typically associated with Grade 3 for the 600 series. The deadbolt features a 1-inch throw and SmartKey technology that provides increased bump and pick resistance compared to traditional pin tumbler locks.
Q: Does the Kwikset 665 polished brass finish have antimicrobial properties?
Yes, the Kwikset 665 features Microban antimicrobial protection integrated directly into the polished brass finish. This technology continuously inhibits bacteria growth on the surface and doesn’t wash off or wear away over time.
Q: What makes the Kwikset 665 different from the single-cylinder 660 model?
The Kwikset 665 is a double-cylinder deadbolt requiring a key on both sides, while the 660 features a single cylinder with an interior thumbturn. The 665’s double-cylinder design provides enhanced security for doors with glass panels or sidelites where an intruder could break glass to reach an interior thumbturn.
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