The distance from the edge of a door to the center of where a door knob is installed is precisely defined as the door backset. This critical measurement for residential door locks in the United States commonly comes in two standard sizes: 2-3/8 inches or 2-3/4 inches.
Understanding Door Backset
The door backset refers to the specific measurement from the edge of your door to the central point of the 2-1/8-inch bore hole. This bore hole is the pre-drilled opening where the door knob, lever, or deadbolt will be mounted. It's a fundamental dimension that determines the placement of the lockset on the door.
Common Backset Measurements
In the U.S., homeowners typically encounter two standard backset dimensions for residential door hardware. Knowing which backset your door requires is crucial for proper hardware installation and function.
| Backset Measurement | Application |
|---|---|
| 2-3/8 inches | A common standard for residential door locks |
| 2-3/4 inches | Another common standard for residential door locks |
Why Backset is Important
Understanding your door's backset is essential when selecting or replacing door hardware. It ensures that the new knob, lever, or deadbolt aligns correctly with the existing bore hole and the door's edge, facilitating a proper and secure installation. Installing hardware with the wrong backset will prevent the lock from fitting or functioning correctly.
For more detailed guidance on door hardware, including how to determine your door's backset, you can consult resources from home improvement experts like Lowe's.
[[Door Hardware]]
