Standard Bore Size For Residential Door Lock
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.
Standard bore size for residential door lock. Most of the current locks require the standard 2 1 8 bore. Opening heights 3 0 through 4 11 15 16 centered in door height not frame. Fit into the door prep shown above. Cross or edge bore.
Lock bore the diameter of the hole for the lock body. There are many types of door locks which can influence the lock hole size as well. Still more exceptions standard interior slab doors are 80 inches tall. The standard bore is 2 1 8.
If you re installing several doors it s acceptable to drill the doorknob hole at 40 inches or centered vertically. If one wants to replace their locks on doors that have smaller diameter holes there are 2 options. The standard measurement for a bore hole is 2 1 8 inch in diameter and the standard measurement of a cross bore is 1 inch 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.
Exterior doors are typically 1 3 4 inches thick while interior doors measure 1 3 8 inches thick. Installation at 40 inches is common on affordable homes mobile homes and production homes. Usually the backset measures 2 3 8 inches or 2 3 4 inches. The latch will fit into the 1 inch hole.
The standard sized bore hole is 2 1 8 in diameter. Many older doors had bores that were been smaller. If you have a door that already has a bore hole in it measure the diameter of this hole to make sure the back plate or rosette will fit. All standard bored locks ansi 115 2 161 61l type for mortise lock ansi 115 1 86 type all locations must be altered 3 8 lower and standard strike asa type.
First doors can usually be re drilled. The cross bore is the place where the latch has to be installed. Bore a 2 1 8 inch hole through the door. The center of this hole should be located 2 3 8 inches or 2 3 4 inches back from the edge of the door.
In addition to the two cross bores a door can be prepped for one of 3 different types of latches.