- Choose a Grade 1 or Grade 2 ANSI/BHMA deadbolt with a full 1-inch bolt throw for a front door.
- A reinforced strike plate with 3-inch screws into the stud matters as much as the lock itself.
- Single-cylinder deadbolts are the safer pick for most homes; check local codes before using double cylinder.
- Smart deadbolts need the same grade and strike checks, plus a plan for dead batteries.
The best deadbolt for most front doors is an ANSI/BHMA Grade 1 or Grade 2 single-cylinder deadbolt with a full 1-inch bolt throw, installed with a heavy strike plate and 3-inch screws into the wall framing. The brand matters less than the grade and the installation. A strong lock in a weak door frame can still be kicked in, so the strike side deserves as much attention as the lock itself.
Below is what to look for, what to skip, and how smart deadbolts fit in.
Start with the ANSI/BHMA grade
ANSI/BHMA grades are standardized tests for locks. The Builders Hardware Manufacturers Association (BHMA) tests deadbolts for strength, durability and resistance to forced entry. The grade is usually printed on the box or in the product specs.
| Grade | What it means | Good fit for |
|---|---|---|
| Grade 1 | Highest rating, built to commercial standards | Front doors, side doors, rentals with heavy use |
| Grade 2 | Solid residential rating | Most front doors in a typical home |
| Grade 3 | Basic rating, the minimum standard | Interior or low-risk doors |
Some packaging also shows a newer residential rating that uses letters (A, AA or AAA) for security, durability and finish. More letters means a better score in that category. If a deadbolt shows neither a grade nor a rating, treat that as a warning sign.
For a front door, aim for Grade 2 at minimum. Grade 1 is worth it if the door gets heavy use, faces a street or isn’t visible from neighbors.
Other specs worth checking
- Bolt throw: The bolt should extend a full 1 inch into the frame. Shorter bolts are easier to pry or force.
- Hardened bolt: Look for a hardened steel insert inside the bolt, which helps resist sawing.
- Pick and bump resistance: Many mid-range locks are easy to pick or bump. Locks with security pins or patented key designs hold up better.
- Backset and door thickness: Most US doors use a 2-3/8 or 2-3/4 inch backset (the distance from the door edge to the center of the hole). Most deadbolts adjust to both, but measure before you buy, especially on thick or older doors.
If you want resistance to picking, bumping and unauthorized key copies, look at high-security locks. They use restricted keys that can’t be copied at a hardware store kiosk.
Single cylinder vs. double cylinder
A single-cylinder deadbolt has a key on the outside and a thumb turn on the inside. A double-cylinder deadbolt needs a key on both sides.
The usual argument for double cylinder: if your door has glass near the lock, a burglar can’t break the glass and reach in to turn the thumb turn.
The argument against it is serious. In a fire or other emergency, everyone in the house has to find a key to get out. Kids, guests and older family members may not know where it is. Some building and fire codes limit double-cylinder locks on doors used as exits, so check with your local code office or your HOA or landlord before installing one.
For most homes, we recommend a single-cylinder deadbolt. If you have glass beside the door, consider these instead:
- Replace the glass panel with laminated or security glass, or add security film.
- Use a single-cylinder deadbolt with a thumb turn that can be locked or removed when you’re away.
- Add a second lock higher on the door, out of reach from the glass.
The strike plate and 3-inch screws matter most
Most forced entries through front doors don’t defeat the lock. They break the door frame. The deadbolt stays locked while the thin wood of the door jamb splits away around it.
The strike plate is the metal plate on the frame that the bolt slides into. Most locks come with a small plate and short screws, often under an inch long. Those screws only bite into the soft trim of the jamb, not the solid wall framing behind it.
To fix that:
- Use a reinforced strike plate. A heavy-gauge plate, ideally a box strike with a metal pocket around the bolt, spreads the force of a kick.
- Use 3-inch screws. Long screws go through the jamb and into the stud behind it. That turns the whole wall into part of the lock.
- Drive screws at a slight angle toward the stud so they catch solid wood, and don’t overtighten. Overtightening can pull the jamb and throw off the door’s alignment.
- Check the hinge side too. Swap at least one screw in each hinge for a 3-inch screw so the door can’t be forced from that side.
- Test the bolt. It should slide fully into the strike without you pushing or lifting the door. If you have to fight it, the bolt may not be fully extending, which weakens the lock and wears it out faster.
We cover more door hardening steps in our guide on how to secure your front door.
Smart deadbolts: what to know
Smart deadbolts let you lock and unlock with a code, phone app, fingerprint or voice assistant. They’re convenient, especially for families, short-term rental hosts and anyone tired of hiding a spare key.
The same rules apply: check the grade and the bolt throw. Many smart locks carry a Grade 2 or Grade 3 rating, and a few reach Grade 1. A smart lock is still a deadbolt, so it still needs a good strike and long screws.
Things to compare before buying:
- Connection type: Wi-Fi models work from anywhere but use more battery. Bluetooth models work only when you’re nearby unless you add a hub. Z-Wave and Zigbee models need a compatible smart home hub.
- Battery life and warnings: All smart locks run on batteries. Look for low-battery alerts and an emergency power option, such as terminals for a 9-volt battery or a USB port on the outside.
- Keyed backup: Many smart locks still have a key cylinder. That’s useful if electronics fail, but the cylinder is often a basic one. Some models have no key at all, which removes the pick risk but means you depend fully on the electronics.
- User codes and logs: Separate codes for each person let you delete one code without changing them all, and an access log shows who came and went.
- Weather: Exterior keypads take direct sun, rain and humidity, which Charlotte summers bring plenty of. Check the operating temperature range and whether the keypad is rated for outdoor use.
A simple keypad deadbolt without Wi-Fi is a middle ground. You get keyless entry and codes you can change, with fewer things to break. See our keypad lock installation page for what’s involved.
Keep keys matching across doors
If you’re replacing the front deadbolt, think about your other exterior doors too. It’s common to end up with three different keys for three doors. A locksmith can rekey new and existing locks of the same keyway so one key works them all. If you just moved in, rekeying also cuts off anyone who had keys from the previous owner. Our rekey service covers this.
DIY or professional install?
Swapping a deadbolt into an existing hole is a reasonable DIY job if the door and frame are in good shape. It gets harder when:
- The door needs a new bore or edge hole drilled.
- The bolt doesn’t line up with the strike.
- The jamb is split, soft or damaged from a past break-in.
- You’re installing a smart lock on a door that sticks or sags.
Our technicians install customer-supplied locks or bring hardware, and we come to your home anywhere in our Charlotte service area. Learn more on our lock installation page, or see what affects the price on our locksmith cost page.