Worried about your home’s security? In today’s world, finding the perfect balance between robust protection and modern convenience is key. That’s where a smart lock double cylinder comes in. Unlike a standard single-cylinder lock, which has a thumb turn on the inside, a double cylinder lock requires a key to open from both the inside and the outside. This significantly boosts security, preventing intruders from simply breaking a window and turning a knob to gain entry.
When you combine this double-keyed security with smart features like keypads, fingerprint access, or app control, you get a formidable defense system for your home or property. Whether you’re upgrading an old door, securing a gate, or just looking for peace of mind, choosing the right smart lock double cylinder can make all the difference. We’ve dug deep to find some of the best options on the market, blending traditional strength with cutting-edge technology. Let’s dive in!
Product Reviews
1. Kwikset 665-S Double Cylinder Deadbolt with SmartKey from…
This Kwikset deadbolt is a solid, reliable choice for those prioritizing fundamental double-cylinder security. While not “smart” in the electronic sense, it offers the core benefit of requiring a key on both sides, making it a robust mechanical barrier. Its standout feature is the SmartKey re-key technology, which allows you to re-key the lock yourself in seconds, a huge convenience if you ever lose a key or need to restrict access quickly without replacing the entire lock. It’s a foundational piece of security that can be paired with smart home systems if you desire a layered approach.
Key Features:
– Double cylinder design (keyed on both sides)
– SmartKey re-key technology for easy re-keying
– For use on exterior doors where keyed entry and security are needed
– Adjustable latch to fit all standard door preparations
Pros:
– Enhanced security by requiring a key from both sides
– SmartKey feature is incredibly convenient for re-keying
– Durable and reliable Kwikset quality
– Easy to install for DIY enthusiasts
Cons:
– Not a “smart lock” with electronic features (e.g., app, keypad, fingerprint)
– Requires a key for exit, which can be a safety concern in emergencies
– Check local fire codes as double cylinders may not be permissible in all areas
User Impressions: Customers frequently praise its robust build and the simplicity of the SmartKey re-keying function. Many appreciate the added security for exterior doors, though some note the need to keep a key handy for quick exits. It’s seen as a strong, traditional security upgrade.
2. Double Sided Keypad Door Knob with Dual Cylinders and Key…
Now we’re talking smart! This innovative double-sided keypad door knob brings serious electronic security to the table. Its key feature is having keypads and cylinders on both sides, offering multi-functional control for secure access both in and out. This makes it ideal for unique applications like garden gates, fence doors, or commercial spaces where bi-directional control is essential. Plus, with 50 access codes per keypad and a backlit design, convenience is at your fingertips day or night.
Key Features:
– Two-way security with keypads and cylinders on both sides
– 50 access codes per keypad, backlit for night use
– Flexible settings: auto/manual locking, bi-directional/uni-directional control
– Password synchronization between sides for ease of management
– Anti-peeping user code protection, low battery beep
– IPX6 waterproof rating, withstands extreme temperatures (-22°F to +176°F)
– Made of high-quality zinc alloy with electroplated coating
– Type-C USB charging port for emergency power
Pros:
– Unparalleled two-way electronic access control
– Highly versatile for various door types and scenarios
– Robust weather resistance for all-season use
– Convenient code synchronization and emergency power options
– Strong build quality for durability
Cons:
– Requires batteries (AAA), though consumption is low
– Installation might be more involved than a simple deadbolt
– Door knob style may not suit all aesthetic preferences
User Impressions: Users rave about the flexibility and enhanced security this lock provides, especially for unusual entry points like fence gates. The weather resistance is a big hit, and the dual keypads are seen as a game-changer for shared access points.
3. BOTHSTAR Double Sided Keyless Door Knob Lock with…
The BOTHSTAR Double Sided Keyless Door Knob Lock takes the dual-sided concept up a notch by integrating fingerprint access alongside keypads and traditional keys. Its 4-in-1 unlock methods (fingerprint, codes, keys, remote sharing codes) provide supreme flexibility and security. The instant 0.25s fingerprint recognition on both sides is a standout, offering rapid and secure entry/exit. This is truly a comprehensive smart lock double cylinder solution for various applications, from homes to Airbnb rentals.
Key Features:
– 4-in-1 Unlock ways: Fingerprint (100 capacity), 50 user codes, back-up keys, remote sharing codes
– Two-way security for in and out control
– Voice Navigation and 0.25s fingerprint recognition
– Flexible auto-lock settings (2s to 12hr delay, or no lock)
– Remote control by generating dynamic temporary codes (no Wi-Fi needed for remote code generation)
– Anti-prying technology, Silent Mode, Low battery voice prompt
– IPX6 waterproof rating, withstands extreme temperatures (-22°F to +176°F)
– Durable zinc alloy construction with electroplated layer
– USB-C port for emergency power
Pros:
– Multiple unlock methods provide ultimate convenience and security
– Fast and reliable fingerprint recognition on both sides
– Remote code generation is perfect for visitors or rentals
– Excellent weather resistance and robust build
– Flexible locking settings for various needs
Cons:
– No direct Wi-Fi connectivity for real-time monitoring (though remote code generation is possible)
– Battery reliance, but includes emergency power option
– Higher price point due to advanced features
User Impressions: Customers love the versatility of unlock methods, especially the quick fingerprint access. Landlords and Airbnb hosts particularly appreciate the remote code generation feature, making guest management a breeze. Its robust weather resistance is also a frequently praised aspect.
4. Kwikset 665-S Double Cylinder Deadbolt with SmartKey from…
Just like its identical twin (Product 1), this Kwikset 665-S offers reliable double-cylinder security. It’s designed for those who need a key on both sides of the door for enhanced protection, preventing quick exits or entries without the proper key. This product emphasizes the crucial safety aspect of checking local codes before installation, as double cylinder locks aren’t always suitable or permitted for primary exit doors due to emergency egress concerns.
Key Features:
– Double cylinder design (keyed on both sides)
– SmartKey security technology for convenient re-keying
– Enhances security by requiring a key for operation on both sides
– Designed for standard door preparations
Pros:
– Strong traditional security barrier
– Easy re-keying with SmartKey technology
– Durable and long-lasting mechanical design
– Simple installation for most homeowners
Cons:
– Lacks any “smart” electronic features
– Potential safety hazard in emergencies if key isn’t readily available
– May not comply with fire safety codes in all areas
User Impressions: Similar to Product 1, users value its dependable mechanical security and the peace of mind it offers against forced entry. The SmartKey feature continues to be a highlight for its practical benefits.
5. Double Sided Keypad Door Knob with Dual Cylinders and Key…
This is the same excellent double-sided keypad lock as Product 2, offering all its fantastic features for comprehensive two-way electronic access. Its core strength lies in providing secure, controlled entry and exit using keypads and physical keys on both sides of the door. This makes it incredibly versatile for places where you need strict bi-directional control, whether it’s a backyard gate, a storage unit, or a communal office entrance.
Key Features:
– Two-way security with keypads and identical keys on both sides
– 50 access codes per keypad, backlit for night use
– Flexible settings: automatic or manual locking, bi-directional or uni-directional control
– Password synchronization for effortless management
– Anti-peeping code protection, low battery alert, Type-C USB charging for emergencies
– Durable, weather-resistant design (IPX6, -22°F to +176°F)
– Made from high-quality zinc alloy with two solid lock cylinders
Pros:
– Superior two-way electronic access control
– Highly customizable settings for auto-lock and access direction
– Robust weatherproofing for outdoor and indoor use
– Convenient password sync feature saves time
– Solid construction for long-term reliability
Cons:
– Relies on batteries, though low power consumption
– May require a bit more effort for initial setup compared to basic locks
– The knob style might not appeal to everyone
User Impressions: Consistent with Product 2, customers love the robust build and the convenience of having keypads on both sides. It’s often recommended for gates and back entrances where traditional single-cylinder options feel less secure.
6. Baldwin Round, Double Cylinder Front Door Deadbolt…
The Baldwin Double Cylinder Deadbolt combines classic elegance with robust security. As a traditional double cylinder, it requires a key from both the inside and outside, adding a strong layer of protection against unauthorized entry. Its standout feature is the SmartKey Security technology (similar to Kwikset’s, as Baldwin is part of the Spectrum Brands family), which not only protects against common break-in techniques but also allows you to re-key your lock in seconds. Plus, it comes with Microban protection for a cleaner surface.
Key Features:
– Two-sided deadbolt: key required on both exterior and interior
– SmartKey Security technology for re-keying and enhanced security
– Easy, DIY installation on standard doors
– Fits standard door thickness (1-3/8” to 1-3/4”) with adjustable latch
– Microban protection for a cleaner surface
– Lifetime mechanical and finish warranty
Pros:
– High-level traditional security
– Convenient SmartKey re-keying feature
– Microban treatment adds a hygiene benefit
– Stylish design from a premium brand
– Lifetime warranty offers great peace of mind
Cons:
– Not a “smart” electronic lock
– Key requirement for exit can be a safety concern in emergencies
– Higher price point due to premium branding and materials
User Impressions: Reviewers appreciate the high-quality feel and finish of Baldwin products. The added security of the double cylinder, combined with the convenience of SmartKey and the Microban feature, makes it a popular choice for homeowners looking for a blend of aesthetics and strong traditional security.
7. SCHLAGE B62N622 Deadbolt, Keyed 2 Sides, Matte Black
Schlage is a household name in home security, and their B62N622 double cylinder deadbolt lives up to the reputation. This deadbolt operates with a key on both the exterior and interior, providing top-tier mechanical security. Its most notable feature is its ANSI/BHMA Grade 1 certification, signifying the highest level of residential security against various attack methods, including crowbars, hammers, and lock picking. The “Snap ‘n’ Stay” design also makes installation surprisingly easy for a high-security lock.
Key Features:
– Keyed on both sides (exterior and interior) for maximum security
– ANSI/BHMA Grade 1 certified for superior protection
– Unique “Snap ‘n’ Stay” design for easy, hands-free installation
– Designed for standard door prep (fits existing pre-drilled holes)
– Durable matte black finish
Pros:
– Highest residential security rating (Grade 1)
– Excellent resistance against various forced entry techniques
– Straightforward installation process
– Trusted brand reputation for reliability
– Ideal for exterior doors needing enhanced security
Cons:
– Purely mechanical, no “smart” electronic functions
– Safety concerns regarding key requirement for exit in emergencies
– Not suitable for all residential fire codes
User Impressions: Users frequently commend the Schlage B62N622 for its heavy-duty construction and solid feel. The Grade 1 security rating gives customers immense confidence, and many find the installation process surprisingly simple for such a robust deadbolt.
8. Kwikset 985 Double Cylinder Deadbolt featuring SmartKey® in…
The Kwikset 985 is another strong contender in the traditional double cylinder market, bringing together designer style with superior security. Like other Kwikset offerings, its standout feature is the SmartKey re-key technology, which empowers you to re-key the lock yourself in just three easy steps. This deadbolt is specifically designed for exterior doors where both keyed entry and high security are paramount, offering a stylish yet secure solution for your home.
Key Features:
– Double cylinder operation (key on both sides)
– SmartKey re-key technology for DIY re-keying
– Designer style as part of the Kwikset Signature Series
– Adjustable latch to fit all standard door preparations
– For use on exterior doors requiring keyed entry and security
Pros:
– Enhanced security with dual-keyed operation
– Convenient and cost-saving SmartKey re-keying
– Blends well with various home aesthetics
– Reliable performance from a well-known brand
– Easy to install
Cons:
– Lacks modern smart features like app control or biometrics
– Requires a key for exit, which can be an egress issue
– Check local building codes before installation
User Impressions: Customers appreciate the aesthetic appeal of the Signature Series combined with the practical security of a double cylinder. The SmartKey feature is consistently highlighted as a major benefit for its ease of use and cost savings.
9. Level Bolt Smart Deadbolt – Make Your Lock Smart &…
The Level Bolt is a revolutionary product that solves a common dilemma: how to get a smart lock without changing the look of your existing hardware. This ingenious device replaces your existing deadbolt’s internal components, effectively turning your traditional lock into a smart lock double cylinder without altering the visible keys or outside appearance. Its sleek, hidden design is its biggest selling point, offering keyless entry via the Level Home App and seamless integration with Apple HomeKit, including Siri voice control.
Key Features:
– Turns your existing deadbolt into a smart lock (hidden design)
– Keyless entry via Level Home App (iOS & Android)
– Share keyless access with trusted individuals
– Works with Apple Home (Siri, automations, shortcuts)
– High security: 6-stage stainless steel gearbox, exceeds industry standards
– Designed for most American standard exterior doors
– Keeps your original keys and hardware look
Pros:
– Maintains the aesthetic of your existing door hardware
– True keyless entry and remote access via app/HomeKit
– Discreet design, blending seamlessly with traditional looks
– High-level security and durability
– Easy to share access remotely
Cons:
– Requires compatibility with existing deadbolt (check dimensions carefully)
– No physical keypad on the outside
– Primarily relies on Bluetooth; HomeKit hub needed for full remote access
– Higher price point
User Impressions: Users are absolutely thrilled with the Level Bolt’s ability to “disappear” while providing full smart lock functionality. The convenience of using existing keys alongside app control is a huge plus. Apple HomeKit users particularly love its integration and responsiveness.
10. Gobrico Keyed Alike Double Cylinder Deadbolts Door Locks…
For those needing multiple double cylinder deadbolts that all open with the same key, the Gobrico Keyed Alike set is an excellent, practical choice. This pack provides two double cylinder deadbolts that are keyed on both sides and come with identical keys – a huge convenience for property owners or those with multiple entry points. It’s a straightforward, reliable mechanical solution for enhancing security across several doors, ensuring every entry requires a key for both access and egress.
Key Features:
– Keyed-alike set (2 deadbolts, 6 identical keys)
– Double cylinder design (key on both sides)
– Satin nickel finish
– Easy to install with a Phillips screwdriver
– Adjustable latch (2-3/8″ or 2-3/4″)
– Fits standard doors (1-3/8″ to 1-3/4″ thick)
– Suitable for left or right-handed doors
Pros:
– Convenience of keyed-alike locks for multiple doors
– Enhanced security by requiring a key on both sides
– Easy and quick DIY installation
– Versatile for various door types (left/right, standard thickness)
– Good value for a set of two
Cons:
– No “smart” features or electronic access
– Requires a physical key for exit, potential emergency egress issue
– Satin nickel finish may not match all existing hardware
User Impressions: Customers love the cost-effectiveness and convenience of having multiple double cylinder locks keyed alike. They find them easy to install and appreciate the solid, secure feel they add to their doors, particularly for sheds, side gates, or rental units.
FAQ Section
Q1: What is a double cylinder lock and how does it differ from a single cylinder?
A double cylinder lock requires a key to lock or unlock from both the inside and the outside of the door. In contrast, a single cylinder lock has a keyhole on the outside but a thumb-turn knob on the inside, allowing for quick exit without a key.
Q2: Why would I choose a smart lock double cylinder?
You’d choose a smart lock double cylinder for enhanced security. The double-keyed nature prevents intruders from breaking a nearby window, reaching in, and simply turning a thumb-turn. When combined with smart features like keypads, fingerprints, or app control, you get the convenience of modern access while maintaining a higher level of physical security against common break-in methods. They’re ideal for gates, storage units, or specific exterior doors.
Q3: Are double cylinder locks safe for emergency exits?
This is a critical consideration. Double cylinder locks can pose a safety hazard in emergencies (like a fire) because they require a key to open from the inside. If the key isn’t readily available, it can trap occupants. For this reason, many building and fire safety codes prohibit their use on primary exit doors of residential homes. Always check your local codes before installing a double cylinder lock on an egress door.
Q4: Do smart double cylinder locks need Wi-Fi?
Not necessarily. While some advanced smart lock double cylinder models offer Wi-Fi connectivity for remote control and monitoring, many operate via Bluetooth, keypads, or fingerprints. Bluetooth-only models typically require you to be within range to operate them via an app. Some may offer a gateway or hub to enable Wi-Fi connectivity as an add-on.
Q5: Can I install a smart lock double cylinder myself?
Many modern smart locks and double cylinder deadbolts are designed for DIY installation, often requiring only a Phillips head screwdriver. However, some advanced models or those with specific wiring needs might be more complex. Always follow the manufacturer’s instructions carefully. If you’re unsure or uncomfortable, it’s best to hire a professional locksmith.
Q6: How do I re-key a double cylinder smart lock?
For traditional double cylinder locks with SmartKey technology (like some Kwikset or Baldwin models), re-keying is a simple, quick process using a provided re-keying tool and a new key. For electronic smart lock double cylinder systems, “re-keying” usually involves deleting old user codes/fingerprints and programming new ones through the keypad or associated smartphone app. Physical keys provided with smart locks can typically only be duplicated by a locksmith.
Q7: What are the main benefits of using a smart double cylinder lock over a traditional one?
The main benefits include increased convenience (no more fumbling for keys), enhanced control (granting/revoking access remotely or on demand), advanced security features (audit trails, anti-peeping codes, biometric access), and integration with smart home ecosystems. While traditional double cylinder locks offer strong physical security, smart versions add a layer of technological flexibility and management.