Standard Bore Size For Residential Door Lock

If you re installing several doors it s acceptable to drill the doorknob hole at 40 inches or centered vertically.

Standard bore size for residential door lock.

There are many types of door locks which can influence the lock hole size as well. Most of the current locks require the standard 2 1 8 bore. If one wants to replace their locks on doors that have smaller diameter holes there are 2 options. The small hole along the edge of the door frame usually measuring about 1 inch in diameter.

Usually the backset measures 2 3 8 inches or 2 3 4 inches. First doors can usually be re drilled. The latch will fit into the 1 inch hole. 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.

Exterior doors are typically 1 3 4 inches thick while interior doors measure 1 3 8 inches thick. In addition to the two cross bores a door can be prepped for one of 3 different types of latches. Many older doors had bores that were been smaller. The cross bore is the place where the latch has to be installed.

This cross bore is where the latch is installed. 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 door has a bore that is around 1 inch in length and it extends from the door edge and goes through the bore hole. The standard bore is 2 1 8.

Bore a 2 1 8 inch hole through the door. 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. 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. Through the edge of the door there is a 1 cross bore that extends from the edge of the door through the bore hole.

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. The standard sized bore hole is 2 1 8 in diameter. Fit into the door prep shown above. Cross or edge bore.

Opening heights 3 0 through 4 11 15 16 centered in door height not frame.