Exterior locksets commonly have a 2 and 3 4 inch backset.
Interior door handle hole size.
The standard sized bore hole is 2 1 8 in diameter.
The two most common are 5 1 2 and 6 from the centers of the two holes.
The backset is the distance from the edge of the door to the center of the giant hole you drill in the face of the door.
Mark the line at 2 3 4 inches for an exterior door.
To know where to drill this hole from the edge of the door you need to know the backset of the lockset.
The point where the two lines intersect is the center of the hole.
Measure from the center of the door knob hole to the edge of the doorway to find the size of the door set.
Bore a 2 1 8 inch hole through the door.
Most interior doors are prepped with a single boor hole.
In most cases the door set which is inside of the door and controls the door latch.
Through the edge of the door there is a 1 cross bore that extends from the edge of the door through the bore hole.
Choose the mark that corresponds to the door width.
Lock spacing the distance between two locks.
Backsets and 1 3 8 in.
Cross or edge bore.
Most interior locksets have a 2 and 3 8 inch backset.
Exterior doors are typically 1 3 4 inches thick while interior doors measure 1 3 8 inches thick.
Note that the template offers two possibilities for the barrel hole one for a 1 3 8 inch door and one for a 1 3 4 inch door.
It works for 2 3 8 in.
Tape the template to the door and mark the centers of the lockset and barrel hole by making an indentation with the tip of a spade bit.
It features two bi metal hole saws and a height alignment window for accuracy.
You ll be using a 2 1 8 inch hole saw to drill the hole for the typical interior or exterior doorknob.
This cross bore is where the latch is installed.
The hole saw has a pilot bit that centers on the mark.
Fit into the door prep shown above.
When replacing locks the latch backset needs to match the holes bored in the door.
This is the backset dimension bore a 1 inch hole in the edge of the door located on the centerline of the 2 1 8 inch hole.
The center of this hole should be located 2 3 8 inches or 2 3 4 inches back from the edge of the door.
The small hole along the edge of the door frame usually measuring about 1 inch in diameter.
The latch will fit into the 1 inch hole.