In the previous edition of the ada standard section 4 13 9 included this statement.
Lockset floor distance.
Usually the backset measures 2 3 8 inches or 2 3 4 inches.
The distance between the edge of the door and the center of the lock hole.
Backset distance is the distance from the door s edge to the center of the handle s mounting hole.
Two standard backsets are 2 3 8 and 2 3 4.
Latch bolt projection is the length the latch bolt extends from the door s edge.
Two standard backsets are 2 3 8 and 2 3 4.
The measurement is usually 2 3 8 inches for interior doors and 2 3 4 inches for exterior doors.
What is the ansi recommendation for the distance between the actuator and the door opening.
Mounting height of hardware.
The small hole along the edge of the door frame usually measuring about 1 inch in diameter.
It only required a mounting.
If you re installing a lockset in an existing door take out the old lockset and measure the backset the distance from the door edge to the center of the lockset hole.
The two important variables when installing a lockset are the height of the knob above the finish floor and the backset the distance from the center of the knob to the near edge of the door.
Hardware required for accessible door passage shall be mounted no higher than 48 in 1220 mm above finished floor the standard did not define the low limit of the hardware mounting height.
Backset the distance from the edge of the door to the center of the lock bore.
Installers typically drill the hole centered 36 inches above the floor if not specifically instructed to do so differently exceptions to the rule include doors that provide egress into swimming pools or other water features.
Refer to this when you buy your new lockset to make sure the hardware is.
For technical drawings and 3 d models click on a part number.
The ansi 156 19 standard states in appendix a 5 knowing act switches that wall actuators are to have an installation height of a minimum of 34 and a maximum of 48 center of the switch off the finished floor and preferably located.
Cross or edge bore.
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Most knobs are positioned a comfortable 36 or 38 inches above the floor.
The international building code has established doorknob height between 34 and 48 inches above a finished floor.
