How a deadbolt works

A deadbolt has no spring. When you turn the key or thumbturn, a rigid bolt extends (or retracts) from the lock body into a reinforced strike in the door jamb. Because nothing pushes it back automatically, an intruder can’t "loid" it with a card or pry the latch the way they can with a spring-loaded knob lock. Real-world security comes from three things together: the grade of the deadbolt, the length of the bolt throw (a full 1-inch throw is standard), and a reinforced strike plate anchored with 3-inch screws into the wall stud.

Common types of deadbolts

Single-cylinder

Keyed on the outside, thumbturn on the inside. The most common residential deadbolt.

Double-cylinder

Keyed on both sides — no thumbturn. Used on doors with nearby glass, but there are important safety trade-offs (see below).

Lockable thumbturn

A middle ground: a thumbturn that can be key-locked, giving glass-door security without a permanently keyed interior.

Smart deadbolt

A deadbolt driven by a keypad or app instead of (or in addition to) a key.

Vertical / "jimmy-proof" deadbolt

Surface-mounted interlocking bolt often seen on apartment and older doors; resists spreading the frame.

Pros & cons

Pros

  • Far more force- and pry-resistant than a spring latch
  • Can’t be slipped with a card like a knob lock
  • Inexpensive, huge security-per-dollar upgrade
  • Works on virtually any door with no power needed

Keep in mind

  • Only as strong as the strike plate and frame behind it
  • A quality Grade-1 deadbolt still can’t stop a determined pro alone — layer it with a reinforced strike
  • Double-cylinder versions can trap you in a fire (see comparison)

Single-cylinder vs double-cylinder: security vs. escape

Double-cylinder deadbolts remove the interior thumbturn so a burglar can’t break nearby glass, reach in, and turn the lock. The trade-off is real: in a fire or emergency you need a key to get out, which can be dangerous and may violate local egress codes on some doors. For most homes we recommend a single-cylinder Grade-1 deadbolt with a reinforced strike, or a lockable thumbturn when there’s glass within reach — you get the security without locking yourself in.

When a deadbolt upgrade makes sense

  • Any exterior door protected only by a knob or lever lock
  • After moving into a home or unit (pair with a rekey so old keys stop working)
  • Doors with a short bolt throw or a flimsy builder-grade strike plate
  • Rental turnovers where you want dependable, low-maintenance security

Deadbolts service in Gainesville & Ocala, FL

Reading up is one thing — getting it installed right is another. Be Secure Locksmith’s licensed, mobile technicians handle new lock installation for homes and businesses across Gainesville, Ocala, and the surrounding North Central Florida communities. Not sure we reach you? See all service areas.

352-706-5295 New lock installation

Related product guides

High-Security Locks Mortise Locks

Frequently asked questions

What is the difference between ANSI Grade 1 and Grade 2 deadbolts?
ANSI grades rate how much force and how many operations a lock survives. Grade 1 is commercial-strength (the highest residential-available tier), Grade 2 is solid residential, and Grade 3 is basic. For an exterior door, a Grade 1 or good Grade 2 deadbolt with a reinforced strike is the sweet spot.
Should I get a single- or double-cylinder deadbolt?
Single-cylinder is best for most homes because you can always exit without a key. Consider a double-cylinder or a lockable thumbturn only when there is glass within arm’s reach of the lock — and check that it is allowed for that door under local fire-egress rules.
Are deadbolts pick-proof?
No lock is truly pick-proof, but a good deadbolt raises the bar significantly. If you want strong pick, drill, and key-copy resistance, look at a high-security deadbolt with a restricted keyway.
Can you rekey my existing deadbolt instead of replacing it?
Usually, yes. If the deadbolt is good quality and in good shape, rekeying is faster and cheaper than replacement and makes all old keys stop working.

Ready to talk deadbolts?

Have questions about deadbolts — or ready to upgrade? Be Secure Locksmith serves Gainesville, Ocala, and all of North Central FL. Contact us today for a free, no-obligation quote.

352-706-5295 Book Now