Standard Interior Door Backset

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

Standard interior door backset.

Some door manufacturers carry stock doors in 7 foot and 8 foot heights and door widths from 24 inches to 42 inches. The bore hole is the large diameter hole where the door knob is mounted. However patio doors are routinely available in 6 foot 11 inch and 8 foot heights. The method or measuring hinge backset varies between sdi and naamm hmma.

Most interior doors are prepped with a single boor 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. For operating clearance the hinge backset on the door is 1 16 less smaller than the hinge backset on the frame. Opening heights 3 0 through 4 11 15 16 centered in door height not frame.

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. 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 1 out of 5 stars 788 24 20 24. A backset is the distance from the center of the cross bore to the edge of the door. This cross bore is where the latch is 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. If your doors are not pre drilled measure the stile width. The most common backset is 2 3 8 but 2 3 4 is also quite common usually used on exterior doors. Sometimes it s easier to measure from the edge of the door to the highest point on the bore hole.

Most modern doors have a 2 frac38 backset although exterior doors and some larger interior doors may have a 2 backset. Standard backsets are either a 2 3 8 backset or 2 3 4 backset. Patio doors are constructed of glass with a frame. 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.

The two standard backset measurements in north america are 2 3 8 inches and 2 3 4 inches.