A deadbolt is the main lock on most exterior doors. Unlike a spring latch, its bolt can't be pushed back with a card or knife, which is why it does most of the work in keeping a door shut against force.
Single vs double cylinder
A single cylinder deadbolt has a key on the outside and a thumb-turn inside, the most common choice for homes. A double cylinder needs a key on both sides, which can help on doors with glass panels, but it can slow you down in an emergency exit. Check local building and fire codes before fitting one, and never leave a household without a quick way out.
Understanding grades
Many deadbolts are graded under ANSI/BHMA standards. Grade 1 is the highest and is common on commercial doors, Grade 2 is a solid residential choice, and Grade 3 meets the basic standard. A higher grade generally means more durable parts and better resistance to force.
The strike plate matters as much as the lock
Even a strong deadbolt is only as good as the frame it locks into. Many doors are forced by splitting the frame, not by defeating the lock. A reinforced strike plate fixed with long screws that reach the framing behind the door jamb is one of the most effective, low-cost upgrades you can make.
Smart and keypad deadbolts
Smart deadbolts let you lock and unlock with a code, phone or fingerprint, and many log who came and went. They suit households with lots of comings and goings, rentals and anyone who tends to forget keys. Most still include a key cylinder as a backup.
When to upgrade
- Your deadbolt is loose, sticks or only partly throws.
- The door has been forced or damaged.
- You have moved in and want better hardware, not just a rekey.
- You want keyless convenience.
Lynwood Locksmiths installs and upgrades deadbolts across 90262. Call 310-844-9189 or see our residential services.
