Backset the distance from the edge of the door to the center of the lock bore.
Door handle distance from edge.
You can see the bore hole that is 2 1 8 in diameter.
Through the edge of the door there is a 1 cross bore that extends from the edge of the door through the bore hole.
In the united states there are two common backsets for residential door locks.
This cross bore is where the latch is installed.
The backset is the distance from the edge of the door to the center of the 2 1 8 inch bore hole.
Door knobs can be difficult for the young and elderly to operate.
Other backsets include 2 used by national and lori lock and 5 used by weiser weslock kwikset and others.
The bore hole is the large diameter hole where the door knob is mounted.
Backset the backset is the distance from the edge of the door to the center line of the prep in the door.
Pack your locks with a 2 3 8 inch or 2 3 4 inch latch depending on which backset you specify.
The location of the door handle along the vertical axis on the door may vary between 34 to 48 inches 860 to 1 220 mm.
The standard sized bore hole is 2 1 8 in diameter.
The horizontal distance measured from the edge of the door to the center point of the bore hole.
The distance from the edge of the door to the center of the handle is called the backset.
The door prep image seen to the left applies to any standard tubular lock or latch set including interior door knobs door levers deadbolts entry door handle set and door handle plates.