What door lock do I have? Identifying different types of door lock

When reaching out to a locksmith, it’s essential to have a clear understanding of the type of lock that requires repair or replacement. You can utilize our visual guide below to help identify your specific lock type.


Among the various types of locks, deadbolts are the most commonly used for front doors. They are widely regarded as more secure than standard spring locks because they cannot be opened unless a key is used to rotate the lock cylinder to the open position.

Deadbolts typically come in two subtypes:

  1. Single Cylinder: These locks require a key on the outside and feature a thumb turn on the inside for easy locking and unlocking.

  2. Double Cylinder: Double cylinder deadbolts necessitate a key for both the inside and outside, providing added security but requiring a key for both entry and exit.

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Euro Profile Cylinders

Deadbolt locks can be categorized into three distinct types based on their operation:

  1. Single Cylinder: These locks are operable on one side using a key.

  2. Double Cylinder: A key can be used on both sides to operate these locks.

  3. Thumb Turn: Thumb turn deadbolts feature a key-operated locking cylinder on one side and a thumb turn on the other, allowing for easy locking and unlocking from the inside without a key.

Cam Locks

Cam locks are often overlooked, but they serve a crucial role in security, especially for applications like securing filing cabinets. What’s intriguing about cam locks is their versatility:

  1. Rotation: Cam locks can rotate to either 90 or 180 degrees, providing flexibility in their application.

  2. Direction: They can be configured to rotate clockwise or counterclockwise, accommodating different installation requirements.

  3. Tailpieces: Depending on their length and design, cam locks can be combined with various tailpieces, allowing for multiple locking mechanisms to interact with each other, enhancing security and functionality.

Digital Locks

Digital security locks have long been employed in hotels and vehicles, but their adoption in households has gained momentum only recently. These locks offer several advantages:

  1. Access Methods: They can be operated by entering a pin code or using a swipe card, providing convenient and flexible entry options.

  2. Rekeying: Digital locks are easily “rekeyed” without the need to change the lock mechanism itself, making it straightforward to update access credentials and enhance security as needed.

Code Locks

The use of numerical or symbolic sequences for lock access remains a popular choice today. There are several advantages to this approach:

  1. High Combinations: These locks typically offer over 10,000 possible combinations, making it highly improbable for someone with malicious intent to guess the code easily.

  2. Security: The complexity of the combination adds an extra layer of security.

However, managing multiple locks with associated codes can become challenging when there are numerous combinations to keep track of.

Smart Locks

Smart locks represent the latest advancement in lock technology, offering a wealth of features and connectivity. These locks have evolved significantly:

  1. Internet Connectivity: Smart locks can connect to the internet, allowing remote access and control.

  2. Keyless Operation: They eliminate the need for traditional keys or thumb turns. Instead, they can be effortlessly activated via a smartphone app.

  3. Integration: Smart locks seamlessly integrate with your smart home ecosystem, providing added comfort and convenience compared to conventional locks. This integration allows for enhanced automation and security features.

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