Standard Interior Door Backset

Buy the correct door hardware for the application so the door handles for passage or privacy have the correct back set and bore.

Standard interior door backset.

Most interior doors are prepped with a single boor hole. The bore hole is the large diameter hole where the door knob is mounted. The method or measuring hinge backset varies between sdi and naamm hmma. 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.

Standard backsets are either a 2 3 8 backset or 2 3 4 backset. The two standard backset measurements in north america are 2 3 8 inches and 2 3 4 inches. As the most common and popular type of door hardware available today standard sets come in a tremendous variety of styles and designs. Through the edge of the door there is a 1 cross bore that extends from the edge of the door through the bore hole.

This cross bore is where the latch is installed. Prime line e 2497 mortise keyed lock set with glass knob perfect for replacing antique lock sets and more fits doors with 2 3 8 backset 4 2 out of 5 stars 807 24 19 24. Backset a backset is the distance from the center of the cross bore to the edge of the door. 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.

2 3 4 is the default backset i use for cylinder locks. 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. Most standard interior doors are 1 3 8 inches thick and the door is slightly beveled to make the closure into the jamb. The standard sized bore hole is 2 1 8 in diameter.

Usually there is a rail at the lock center line on raised panel doors. For operating clearance the hinge backset on the door is 1 16 less smaller than the hinge backset on the frame. Standard door sets which feature a small cylindrical latch mechanism are designed for doors 1 1 thick and drilled with a 2 bore.