Which is one of the four major categories of door locks?

The cylindrical lock is indeed one of the four major categories of door locks. This type of lock is widely used due to its functionality, security features, and ease of installation. Cylindrical locks generally consist of a cylinder that houses the locking mechanism. When the correct key is inserted, it allows the cylinder to rotate, thereby engaging or disengaging the latch or bolt.

Cylindrical locks are commonly found in both residential and commercial settings due to their versatility and the variety of styles available, including those with deadbolt features for added security. Their installation typically requires only one hole drilled in the door, making them a practical choice for many applications.

Other types of locks, such as tumbler locks, chain-locks, and recessed locks, serve different purposes or are used in specific situations. For instance, tumbler locks are a mechanism type but do not refer to a specific category of lock set as cylindrical does. Chain locks provide limited security often used in conjunction with another lock but do not serve as a primary locking mechanism. Recessed locks, meanwhile, may be found in specialized applications but are not categorized among the primary types used in general door security.