Standard Bore Size For Residential Door Lock

If one wants to replace their locks on doors that have smaller diameter holes there are 2 options. Many older doors had bores that were been smaller. In addition to the two cross bores a door can be prepped for one of 3 different types of latches.

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Standard bore size for residential door lock.

Usually the backset measures 2 3 8 inches or 2 3 4 inches. There are many types of door locks which can influence the lock hole size as well. The latch will fit into the 1 inch hole. The center of this hole should be located 2 3 8 inches or 2 3 4 inches back from the edge of the door.

Cross or edge bore. This cross bore is where the latch is installed. Still more exceptions standard interior slab doors are 80 inches tall. The standard sized bore hole is 2 1 8 in diameter.

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. Bore a 2 1 8 inch hole through the door. Opening heights 3 0 through 4 11 15 16 centered in door height not frame. The cross bore is the place where the latch has to be installed.

Lock bore the diameter of the hole for the lock body. Installation at 40 inches is common on affordable homes mobile homes and production homes. 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 bore is 2 1 8.

Most of the current locks require the standard 2 1 8 bore. 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. 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. Exterior doors are typically 1 3 4 inches thick while interior doors measure 1 3 8 inches thick. Fit into the door prep shown above. First doors can usually be re drilled.

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

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