1. Measure Door Width
If the door is thinner than 1½ inches or thicker than 1¾ inches, then the lock will not fit properly on the door.
Diagram shows measuring door thickness with a tape measure, indicating a range of 1½" to 1¾".
2. Measure for Backset
If existing backset is not 2⅜ inches or 2¾ inches, then the lock will not fit properly on the door.
Diagram shows measuring the backset of a door lock mechanism, indicating 2⅜" or 2¾".
3. Measure Hole Sizes
If hole sizes are larger than those shown, then the lock will not fit properly on the door.
If hole sizes are smaller than those shown, see steps 4 and 5.
Diagram shows a door with an edge bore of 1 inch and a cross bore of 2⅛ inches.
4. If Needed, Enlarge Hole in Door
If hole in door is smaller than 2⅛ inches, then use a 2⅛ inch hole saw to enlarge hole.
Diagram shows a 2⅛ inch hole saw being used on a door.
5. If Needed, Enlarge Hole in Door Edge
If hole in door edge is smaller than 1 inch, then use a 1 inch drill bit to enlarge hole.
Diagram shows two options for enlarging the door edge hole: using a 1 inch drill bit, indicated by an arrow labeled "OR".
6. Check Strike (Door Jamb) Preparation
a. Place new strike box and strike against door jamb.
b. If strike box and strike do not fit properly, use pencil to trace around strike box and strike and mark hole positions.
c. If needed, use chisel and drill to correct door jamb preparation.
Diagrams illustrate these steps: (a) placing strike components, (b) tracing for marking, and (c) using a chisel and drill.
