Every lock has a purpose, and the right choice can make daily life safer and simpler. Many homeowners and business owners face confusion because not all locks provide the same level of protection. Some are built to resist break-ins, while others focus on convenience or basic use. This knowledge gap often leads to poor choices that leave properties exposed.
The numbers prove the value of stronger options. In 2024, the global locks market stood at USD 5.8 billion, with deadbolts alone generating USD 1.7 billion and set to double by 2034. That demand shows the trust people place in proven security.
By learning the different types of locks and their uses by our lock experts , you can make smarter, safer everyday choices.
Understanding the Different Types of Locks
Choosing the right lock can be confusing since each one serves a different purpose. A poor choice can also leave security gaps. Continue reading to learn how each type of lock works and which one best suits your needs.
Deadbolt Locks
Deadbolt locks are mainly used on exterior doors for security, as their solid bolt extends deep into the door jamb and resists forced entry better than spring bolts. Because of this strength, they remain a leading choice and are expected to hold 41.3% of the mechanical locks market share in 2025.
To start, single-cylinder models use a key outside and a thumbturn inside, though they are weak near glass panels. By contrast, double-cylinder types require keys on both sides, which blocks that risk but raises fire safety concerns, so many codes restrict their use. For more flexibility, lockable thumbturn versions let you secure the thumbturn with a key. In addition, keyless deadbolts use keypads or scanners for easy entry.
Finally, the latest deadbolts combine fingerprint scanning, keypad entry, and NFC tap-to-unlock features. They can be rekeyed, though the difficulty varies by brand.
Knob Locks
Knob locks are best used together with deadbolts for stronger protection. They are found on many residential doors, often used inside the home for rooms or storage areas. Their design makes them simple to operate with a key outside and a turn knob inside.
However, knob locks are less secure compared to deadbolts. The lock cylinder sits inside the knob, which makes it easier for tools to break or bypass. For this reason, they are not recommended as the primary lock on exterior doors. Double-cylinder versions require keys on both sides, which provides extra security but can raise fire safety concerns if a quick exit is needed.
Lever Handle Locks
Lever handle locks are widely used on interior doors in commercial and institutional settings. They are easier to use than knob locks, which makes them a better choice for people with disabilities or limited hand strength.
Additionally, these locks are ADA accessible and can be installed for either left or right-handed users. This flexibility enables them to accommodate various door setups easily. They also must comply with IBC (International Building Code) requirements for panic hardware in commercial buildings, which ensures a safe exit in emergencies.
However, they provide only limited security, much like knob locks, and should not be used alone on exterior doors. Some models include a clutch feature, which helps protect the lock from damage during forced entry attempts.
Padlocks
Padlocks are portable, free-standing locks not permanently attached to doors or frames. They are versatile and often used to secure gates, lockers, storage units, bicycles, and many other items that need flexible protection. The padlock market was valued at USD 2,009.73 million in 2024 and is expected to grow to USD 2,152.42 million, underscoring its continued importance in everyday security.
When looking at types, there are several options available. Keyed padlocks may be rekeyable or non-rekeyable, and some keep the key locked in place until the shackle is closed. For higher security, shrouded shackles make it harder for bolt cutters to break through. Combination padlocks use dials or keypads, though they can sometimes be decoded or shimmed. Additionally, security ratings are also important, with CEN grades ranging from 1 to 6 in Europe, with grade 6 offering the highest level of protection.
Finally, smart padlocks add a modern option. These connect to smartphone apps, offering convenience and control without the need for a physical key. With so many choices, people can easily match padlocks with their daily security needs.
Cam Locks
Cam locks are most often used in filing cabinets, mailboxes, lockers, furniture, and other low-security applications. They provide a simple way to secure everyday items that do not require high protection.
They work by turning a cam, which is a flat metal piece, with a key or thumbturn. The cam rotates to lock or unlock the item. Rotation may be set at 90 or 180 degrees, giving flexibility in use. Tubular cam locks also exist, and they provide 360-degree rotation for specialized applications.
Additionally, cam locks come in different lengths with various cam or tailpiece options. They can also be keyed alike or differently, based on the security needs. Since they offer only basic protection, they are best suited for low-risk, non-door uses.
Mortise Locks
Mortise locks are installed inside a pocket cut into the door, offering stronger security than surface-mounted locks. They are often used on commercial doors, apartment doors, entry glass doors, and some high-end residential doors.
These locks are valued for their durability and strong resistance to picking, drilling, and forced entry. Mortise cylinders are threaded, secured by a set screw, and use cams to engage the locking hardware.
Many models include both a deadbolt and a latch mechanism, giving extra protection for doors. They also come in different lengths with cam options designed to fit specific hardware needs. In addition, common backset measurements include 2-3/4″ and 2-3/8″ to fit different door preparations.
Electronic and Smart Locks
Smart locks provide keyless entry and can be controlled by smartphones, key fobs, or keypads. These locks fall under electronic and smart lock systems, giving you more control than traditional key locks.
Additionally, many models connect with home automation systems. This allows remote access, guest permissions, and activity alerts straight from your phone. They make daily use easier and give you apparent oversight of who comes and goes.
However, electronic and smart locks depend on power and may need internet or wireless signals. Battery life typically ranges from 8 to 12 months for standard AA batteries in everyday use. Options include keypad locks with code access, biometric locks with fingerprint scans, and app-controlled smart locks. Each offers a balance of security and convenience for safer everyday choices.
Euro Profile Cylinders
Euro profile cylinders (also known as DIN cylinders) are widely used in Europe and are also found in North America for sliding glass doors and room-dividing doors. They are known for their standard design, which allows them to fit both exterior and interior doors with ease. According to Volza’s global import data, 200 shipments of Euro profile cylinders were traded between October 2023 and September 2024, showing stable demand across 59 buyers worldwide.
These locks come in three main types: single cylinder, double cylinder, and single cylinder with thumbturn. Each option serves different needs, providing homeowners with the flexibility to choose based on their safety and convenience requirements. Anti-snap features, such as break points and reinforced cores, are often built in to stop cylinder extraction during forced attacks.
In most cases, the cylinder is held in place by a single screw through the middle. This makes installation simple, but can leave the lock at risk of snapping if it is not reinforced or sized correctly.
Wall-Mounted Locks
Wall-mounted locks are installed directly into walls and are often used in businesses for emergency key access (e.g., Knox-Box). These locks also serve as small safes or deposit boxes, giving owners a secure way to store items or keys.
Additionally, they are most commonly placed during construction, but specific models can also be added to existing buildings. Installation depths typically range from 3″ to 6″, depending on wall construction requirements, which makes them adaptable for different building types.
For more protection, wall-mounted locks can be installed on different wall surfaces and connected to covers or alarm sensors. By linking them with a security system, businesses gain stronger control over access and improved safety.
Interchangeable Core (IC) Cylinders
IC cylinders are widely used in large institutions and businesses for their quick rekeying ability. These locks operate with two keys: the operator key for everyday access and the control key, which allows removal or replacement of the entire core. This design saves time and reduces the need for extensive locksmith work during staff changes or security updates.
Additionally, rekeying is a simple process since only the core is replaced, while the rest of the door hardware remains untouched. Popular brands such as Best, Yale, and Schlage manufacture figure-eight style cores that are trusted in many facilities. IC cylinders are available in both Small Format (SFIC) and Large Format (LFIC) types, offering flexibility based on the lock system in place. Master key systems can also be built with IC cylinders, accommodating thousands of different key combinations across one property.
However, they can only be installed in locks designed explicitly for IC cylinders, not in standard deadbolts or non-IC locks. This makes them a practical choice for businesses that require frequent rekeying, but they are less suitable for typical residential use.
Furniture Locks
Furniture locks include cabinet, desk, drawer, and sliding door locks. They are practical for keeping personal items, documents, and supplies safe within a home or office. These locks add a simple layer of protection without changing the overall design of the furniture.
There are two main types of furniture locks. Bolt style uses a flat metal piece that secures the device, while push button style works with a rod that retracts when unlocked and re-locks once it is back. Some setups also use magnetic locking systems, which offer keyless operation with hidden release mechanisms for added convenience.
Additionally, furniture locks are commonly found on desks, cabinets, filing cabinets, drawers, and sliding doors. Many models can also be added to existing hardware that did not initially include a lock, providing homeowners and business owners with a flexible way to upgrade their security.
Vending/T-Handle Locks
Vending/T-handle locks are mainly used in vending machines, but can be applied elsewhere. Their design makes them practical for devices that need frequent servicing or secure cash storage. Because the lock can be removed once the device is opened, replacement is quick and straightforward.
There are two main types of vending/T-handle locks. The spring latch style re-locks without using a key, making it convenient for repeated access. On the other hand, the dead latch version requires a key to re-lock, offering stronger control and preventing unauthorized closure. Many models also feature anti-drill plates and hardened steel inserts, which protect against physical attacks and improve durability.
Moreover, with the vending machine lock market valued at USD 1.05 billion in 2024 and projected to reach USD 1.65 billion by 2033 at a CAGR of 6.5%, these locks continue to hold a vital role in everyday security solutions.
Jimmy Proof Deadbolts
Jimmy-proof deadbolts are surface-mounted and often used on apartments and double doors. They provide added strength without requiring heavy changes to the door. This makes them a practical choice for renters or property owners who want security without significant modifications.
Additionally, these locks interlock with a jamb bracket that resists forced entry attempts from the outside. Strike reinforcement plates can also be added to distribute force across wider areas of the door frame, giving the setup stronger resistance. Only a small hole for the rim cylinder is needed, and existing locks can be upgraded by replacing the cylinder. As a result, homeowners and business owners gain reliable protection with less effort during installation.
Rim Latch Locks
Rim latch locks use a rim cylinder on one side and a surface-mounted latch on the other. This design makes them simple to install and easy to use for everyday entry points. Latch projection typically ranges from 1/2″ to 3/4″, which ensures proper engagement with the door frame.
They can also auto-lock the door after closing, which adds convenience for apartments or shared living spaces. However, rim latch locks are not designed to withstand heavy force. For stronger protection, they are often paired with deadbolts or other secure lock types on exterior doors
Key in Knob (KIK) Cylinders
KIK cylinders are commonly found in knobs, levers, low-cost deadbolts, OEM applications, and some sliding glass doors. The cylinder is hidden inside the lock, leaving only the circular face visible. This design makes them a frequent choice for both residential and commercial hardware.
However, replacing KIK cylinders can be a challenging task. There are no standard specifications, and the designs vary widely across manufacturers. As a result, selecting the right fit often requires careful matching of the brand and model.
Additionally, KIK cylinders come in different sizes and tail styles. A floating tail rotates partly without moving the cylinder, while a fixed tail moves only with the cylinder itself. Many also include anti-pick features such as spool pins, serrated pins, and mushroom pins, which provide an added layer of security against tampering.
Choosing the Right Lock for Your Needs
Choosing the right lock depends on what you need to protect, while a front door needs stronger protection than a cabinet. If the door leads outside or is subject to regular use, opt for a lock that can withstand pressure and remain strong.
Some locks are easier to use, others work with intelligent systems or allow quick entry. Consider who needs access and how frequently. You may need extra features for kids, workers, or guests.
We recommend consulting with a locksmith before making a purchase. They can help match the right lock to your space, use, and budget.
Can Locksmiths Help with Door Knob Replacements?
Locks are essential for keeping homes secure, and door knobs play a crucial role in both safety and convenience. Many homeowners often wonder if locksmiths can handle door knob replacements in addition to installing or repairing locks.
The good news is that locksmiths are experts in recommending and installing deadbolt locks to enhance your security. Deadbolts provide an added layer of protection, making it more difficult for intruders to break in. To learn more about why locksmiths recommend deadbolt locks, check out our full article, Why Do Locksmiths Recommend Deadbolt Locks?
Make Smarter Lock Choices with Local Locksmith Pros LLC
Not all locks are built the same, and making the right choice matters. At Local Locksmith Pros LLC, we help homeowners and businesses pick locks that fit their real needs, not just what looks secure. Whether it’s a deadbolt, keypad, or cam lock, we’ll guide you toward more innovative, safer options. Contact us and let our team help you protect what matters most