A typical placement is one or two feet above the knob but it can be lower.
Mounting a bolt lock on door.
A lock bolt that is moved by turning a knob or key without action of a spring while most deadbolts aka deadlocks are actually operated by a thumbturn rather than a knob the important point is that the deadbolt is not spring loaded and does not latch automatically.
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Place the lock on the sill butting up against the edge of the non moving door so the bolt hits the moving door and the lock is parallel to the ground.
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Install the barrel bolt at a height that is easily reachable.
There are other combinations of spacing which are used on specialty locks however.
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Lift the door off the hinges and place it on edge with the lock strike of the handle facing up.
The lock strike centerline should be 40 5 16 from the bottom of the frame with the lock in relation to the strike.
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Stabilize the door in a door jig or ask an assistant to hold the door on edge.
The two most common are 5 1 2 and 6 from the centers of the two holes.
The closer it is to the center of the door the more.
When boring deadbolt locks in a door there are two standards for spacing between the bottom lock and the deadbolt.
2 position a flush.
Mark where the mounting screws should be placed as well as where the bolt hits the door.
The deadbolt strike centerline should be 48 from the bottom of the frame.
Installing a deadbolt lock is simple when you have a drill the right hardware and a great teacher.