What is a backset on a door?

A backset is a term used to describe the distance from the edge of a door to the center of the door's lock or latch mechanism. It is an important measurement to consider when installing or replacing door hardware, such as locks or handles.

Typically, there are two common backset sizes: 2-3/8 inches and 2-3/4 inches. These measurements refer to the standard distances from the edge of the door to the center of the lock mechanism, with the most popular backset being 2-3/8 inches.

To determine the correct backset for a door, you can measure the distance carefully from the edge of the door to the center of the bore hole (the large hole where the lock or latch mechanism is installed). It is essential to choose the right backset to ensure that the lock or latch aligns properly with the strike plate (the metal plate on the door frame that the lock or latch engages with).

Different types of doors, such as exterior doors, interior doors, or commercial doors, may have varying backset requirements depending on the hardware being used. It is crucial to consult the manufacturer's specifications and guidelines when installing or replacing door hardware to ensure compatibility and proper functioning.

It's worth noting that some modern door locks or latch mechanisms feature an adjustable backset, allowing for flexibility and easiness when installing or retrofitting. This feature can be beneficial in situations where the door frame already has an existing opening prepared for a different-sized backset.

In summary, the backset of a door is the distance from the edge of the door to the center of the lock or latch mechanism. Choosing the correct backset is crucial for proper installation and functionality of the door hardware.