Most interior doors are prepped with a single boor hole. The Bore hole is the large diameter hole where the door knob is mounted. The standard sized bore hole is 2 1/8" in diameter.
3 Bore the doorknob hole through the face of door using a 2 1/8-inch hole saw; drill halfway through from each side. 4 Use a 1-inch hole saw to bore latch hole in door edge.
When installing a doorknob — more correctly called a lockset — you need to drill two holes into the door. One is for the knobs and the spring-loaded mechanism .
The center of this hole should be located 2 3/8 inches or 2 3/4 inches back from the edge of 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 latch will fit into the 1-inch hole.
I want to replace 35 year old Weslock interior door knobs with new ones from Schlage. The holes in the doors (Masonite/composite type, .