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Hints and Tips
Lock Types
Surface Mount, Rim Mount or Vertical Deadbolt
These names all refer to a single type of lock which bolts flush against the inside face of the door. Vertical bolts from the lock slide up and down through a strike attached to the door frame. This is the most easily installed type of supplemental security lock. They are, however, bulkier and visually more obtrusive than deadbolts which are mounted inside the door.

door lock

Internal Deadbolts
Deadbolts are an inexpensive and effective way of adding security to exterior doors, and make a great supplement to key-in-knob locks. The best deadbolts have at least a 1" bolt with a hacksaw resistant steel pin. They are mounted inside the door and, with reasonable care, can be installed easily using a template provided by the lock manufacturer.
Mortise Lock
Mortise locks are installed in a slot cut into the edge of the door. These locks include both a deadbolt and latch bolt in a single assembly, and come complete with knobs or handles.
Different Types of Locks
Lock & Knob assemblies or locksets, are the simplest and maybe the least effective locks the type which are included as part of the door knob assembly set. They are the first port of call, as most doors need knob & latch assemblies anyway. It is highly recommend, they should always be supplemented by more effective locks for all exterior applications.

A "privacy lock" has a lock on the inside knob only, and is usually used for installation on bathroom or bedroom doors. A "key-in-the-knob" lock, on the other hand, characteristically has a key slot on the outside knob and a button or "thumb turn" on the inside. Key-in-the-knob locks are most often used on exterior doors, although they may also be used on closets or storage room doors where security is a concern.

Assemblies for these locks are called "locksets," and consist of knobs or handles, a latch bolt assembly, and any associated trim--in other words, the entire door knob/lock assembly. They are easy to replace, but an original installation is a bit more challenging since it requires precisely cutting and mortising holes into which the assembly will fit.
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