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Now In: Mortise vs. Tubular Latch
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The tubular latch style lock is pictured below:
This is a simple lock mechanism that is commonly found on all types of doors, but particularly on interior residential and office doors. If you are replacing a tubular latch style lock, and the hole has already been cut in your door, the installation is easily accomplished without professional assistance. Before you begin your installation make sure you have ordered a latch with the correct backset length. Then follow the simple installation instructions.
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How to measure the length of your backset:
If you have a tubular latch lock mechanism you will need to determine your backset. The backset is the distance from the center of the door handle (the part that rotates to turn the lock shaft) to the edge of the door. Generally, on residential interior doors the backset is 2 3/8” (60 mm) and on commercial or front doors the backset is 2 ¾” (70mm). As is the case in the latch pictured below, the length some tubular latches can be adjusted to fit both lengths.
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The mortise style lock is pictured below:
The mortise style lock is generally considered more secure than a tubular latch. Installation requires that the door be cut into in such a way to allow the mortise to slide into the door itself. If your door is not currently cut to fit the mortise lock of your choice, you will likely need the assistance of a professional installer who will use a mortise saw to properly cut into your door to custom fit the lock mechanism. Please note that some metal doors have a “punch out” pattern to easily modify the door to accept a mortise lock; however, not all mortise locks have the same dimensions and before any door is altered careful measurements should be made to make sure the mortise you have chosen will fit properly once your door is modified.
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