2 3 8 inches and 2 3 4 inches.
Door lock setback.
The backset is the distance from the edge of the door to the center of the 2 1 8 inch bore hole.
In the united states there are two common backsets for residential door locks.
Standard backsets are either a 2 3 8 backset or 2 3 4 backset.
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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.
This is called the backset.
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Kwikset and schlage still make backsets that will work with most of their handlesets deadbolts door knobs and levers.
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When you install schlage locks the hole cutout in the door where the lock sits is measured from the edge of the door to the center of the cut out hole on the face of the door.
The most common backset is 2 3 8 but 2 3 4 is also quite common usually used on exterior doors.
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The latch goes through the edge of the door and end should sit at about the center of the cut out on the face.
Pack your locks with a 2 3 8 inch or 2 3 4 inch latch depending on which backset you specify.
The nice thing is you re not restricted to any particular style so you can coordinate the door hardware in the rest of your home with the best matching style of schlage or kwikset.
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