Standard Interior Door Backset

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

Standard interior door backset.

The bore hole is the large diameter hole where the door knob is mounted. Standard door sets which feature a small cylindrical latch mechanism are designed for doors 1 1 thick and drilled with a 2 bore. 44 off the top of a 6 8 door puts you at 36 off the bottom which is the center of most lock rails. Deltana sdl980u5 classic round rosette tubular lock storm screen door latch set with 1 3 4 backset in antique brass 3 8 out of 5 stars 110 36 59 36.

Hinge backset is the dimension from the leading edge of the hinge to either the stop on the frame or to the stop face push side of the door. Backset a backset is the distance from the center of the cross bore to the edge of the door. As the most common and popular type of door hardware available today standard sets come in a tremendous variety of styles and designs. What is backset if you dont have any hardware on your door just measure from the edge of the door to the center of the bore hole the large hole where the door knob assembly is mounted.

Usually there is a rail at the lock center line on raised panel doors. The method or measuring hinge backset varies between sdi and naamm hmma. For operating clearance the hinge backset on the door is 1 16 less smaller than the hinge backset on the frame. Buy the correct door hardware for the application so the door handles for passage or privacy have the correct back set and bore.

From under head cl 9 3 4 top of door 9 5 8 from bottom of frame cl 10 3 8 bottom of door 9 5 8 due to the the fractional calculations the bottom hinge cl may vary plus or minus 1 64 center two hinges are equally spaced between top and bottom. This cross bore is where the latch is installed. The standard sized bore hole is 2 1 8 in diameter. 2 3 4 is the default backset i use for cylinder locks.

Most interior doors are prepped with a single boor hole. The two standard backset measurements in north america are 2 3 8 inches and 2 3 4 inches. To determine the correct backset measurement for your door you need to measure the distance from the edge of the door to the center of your cross bore.