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The backset is the distance between the edge of the door to the center of the main hole. The main hole is usually a round 2 1/8" diameter that the body of the lock fits through. The distance is usually 2 3/8" or 2 3/4". Today, most commercial and industrial doors are set for 2 3/4". The trend has been for more private homes set this way also. These are the two most common backsets. When measuring the backset make sure to do it carefully.
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| The difference is small and it's easy to make a mistake especially if you are measuring with the lock still on the door. You may have noticed that on less expensive lock hardware the backset often is variable. But this is not the case with the better quality heavy duty locksets. |
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Hand of Door is always Determined From the Outside
Here are a few rules to follow:
• The outside of an exterior door is the street or entrance side.
• The outside of a room door is the hall side.
• The outside of a single communicating door is the side from which the hinges are not visible when the door is closed.
• The outside of a closet door is the room or hall side. |
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