Standard Bore Size For Residential Door Lock

The standard sized bore hole is 2 1 8 in diameter.

Standard bore size for residential door lock.

The cross bore is the place where the latch has to be installed. Most of the current locks require the standard 2 1 8 bore. If you re installing several doors it s acceptable to drill the doorknob hole at 40 inches or centered vertically. 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. Lock bore the diameter of the hole for the lock body. First doors can usually be re drilled. The small hole along the edge of the door frame usually measuring about 1 inch in diameter.

This cross bore is where the latch is installed. The standard bore is 2 1 8. 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 one wants to replace their locks on doors that have smaller diameter holes there are 2 options.

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

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. 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. 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 latch will fit into the 1 inch hole. Still more exceptions standard interior slab doors are 80 inches tall. Bore a 2 1 8 inch hole through the door. Many older doors had bores that were been smaller.

Fit into the door prep shown above.