Introduction
Deadbolt locks are a fairly easy way to add security to a door. These locks have long bolts that reach into the jamb and sometimes through to the framing.
A double-keyed deadbolt, which locks with a key on the inside as well as the outside, offers the best security in situations where an intruder could reach through a window to the bolt. However, it is not safe in cases of fire -- if you don't have the key handy, you could be stuck inside.
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1. Drill holes and cut mortise
Following the same techniques as for a lockset (see Installing Door Hinges and Locksets, Related Projects), mark for the position of the two holes and drill them, taking care to hold the drill perpendicular. Insert the bolt and latch face into their hole and mark for the mortise with a sharp knife. Cut the mortise with a chisel.
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2. Assemble the lock
Screw the latch face into the mortise. For many lock types, you'll need to use a screwdriver to partially extend the bolt. Insert the lock tailpiece through the slot in the bolt mechanism and slip on the interior turn bolt or lock until the two pieces sit flush against the door. Fasten the retaining screws. Install the strike plate.
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