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In addition to the two cross bores a door can be prepped for one of 3 different types of latches.
Standard bore size for residential door lock. Many older doors had bores that were been smaller. 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. 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. There are many types of door locks which can influence the lock hole size as well.
Lock bore the diameter of the hole for the lock body. If you re installing several doors it s acceptable to drill the doorknob hole at 40 inches or centered vertically. This cross bore is where the latch is installed. The standard sized bore hole is 2 1 8 in diameter.
The latch will fit into the 1 inch hole. First doors can usually be re drilled. Most of the current locks require the standard 2 1 8 bore. Usually the backset measures 2 3 8 inches or 2 3 4 inches.
If one wants to replace their locks on doors that have smaller diameter holes there are 2 options. 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. Cross or edge bore. Through the edge of the door there is a 1 cross bore that extends from the edge of the door through the bore hole.
Bore a 2 1 8 inch hole through the door. 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. 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 small hole along the edge of the door frame usually measuring about 1 inch in diameter. 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. Fit into the door prep shown above. Opening heights 3 0 through 4 11 15 16 centered in door height not frame.
The standard bore is 2 1 8.
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