You may ask yourself, “Why does it seem as if everyone uses a deadbolt lock”? Many people wonder if they need one on their door or whether or not it is actually more secure than a single latch lock. The reason why U. S. Standard doors come prepped with a deadbolt above the single latch is because it does provide extra security. A deadbolt is stronger and more secure than a single latch. It is different than a single latch because of how it engages that actual door. The deadbolt extends into the door farther than a single latch and is a lot harder to gain unapproved access through. Locksmiths would tell you this. Source: fingerprintdoorlocks
Source:
http://blog.fingerprintdoorlocks.com/importance-of-a-deadbolt-lock.html
