Standard Bore Size For Residential Door Lock

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

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Guide To Door Lock Measurements

Types Of Door Locks The Home Depot

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If one wants to replace their locks on doors that have smaller diameter holes there are 2 options.

Standard bore size for residential door lock.

This cross bore is where the latch is installed. Cross or edge bore. If you re installing several doors it s acceptable to drill the doorknob hole at 40 inches or centered vertically. Lock bore the diameter of the hole for the lock body.

Most of the current locks require the standard 2 1 8 bore. 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. 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. Fit into the door prep shown above. The small hole along the edge of the door frame usually measuring about 1 inch in diameter.

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 standard bore is 2 1 8. 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.

The latch will fit into the 1 inch hole. In addition to the two cross bores a door can be prepped for one of 3 different types of latches. 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 cross bore is the place where the latch has to be installed.

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

First doors can usually be re drilled.

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