A spring latch alone can be pushed back with a thin tool. A deadbolt adds a solid bolt that only moves when you turn a key or thumb-turn, making it far harder to force the door open.
What is a deadbolt?
A deadbolt is a lock with a bolt that extends into the door frame and can't be pushed back by pressure on the bolt itself. It is usually fitted above the door handle.
Types of deadbolt
- Single cylinder: key outside, thumb-turn inside. The most common choice for homes.
- Double cylinder: key on both sides. Useful next to glass panels, but check local fire and building rules, as a key is needed to get out.
- Keypad or smart deadbolt: opens with a code, app or key. Convenient for families and rentals.
ANSI grades
ANSI/BHMA grades locks on durability and strength. Grade 1 is the toughest and is recommended for exterior doors; Grade 2 is a common residential standard; Grade 3 is basic.
Installation makes the difference
Even a strong deadbolt is only as good as the door and frame around it:
- Use a reinforced strike plate with long screws into the stud.
- Make sure the bolt extends fully into the frame (a one-inch throw is common).
- Fix gaps between the door and frame.
- Check the door itself is solid.
Getting it right
Our residential locksmiths install and upgrade deadbolts across Alhambra and can rekey them to match your other locks. Call 626-537-3964.
