Deadbolt Lock

The Benefits of a deadbolt lock

Brooklyn Heights locksmith technicians are very familiar with locks of all types and deadbolt lock is one they say is very secure. dead bolt or dead lock (also deadbolt or deadbolt lock), is a locking mechanism distinct from a spring bolt lock because a deadbolt cannot be moved to the open position except by rotating the lock cylinder. The more common spring bolt lock uses a spring to hold the bolt in place, allowing retraction by applying force to the bolt itself. A deadbolt can therefore make a door more resistant to entry without the correct key.

A deadbolt is often used to complement a spring-bolt lock on an entry door to a building. Is the deadbolt lock the right lock for your security?

Types of Deadbolt Lock

Deadbolt Lock


A deadlock, if it is cylinder operated, may be either single cylinder or double cylinder. A single cylinder deadlock will accept a key on one side of the lock, but is operated by a twist knob on the other side.

Double cylinder locks will accept a key on both sides and therefore do not require, (and often do not have), any twist knob. This prevents unwanted unlocking of the door by forced access to the interior twist knob. Some lock manufacturers also have a “lockable” knob: there a key is always needed on one side (usually external), and a twist knob can be used on the other (internal), unless a button has been pressed, in which case a key is also needed on the (internal) side.

Other types of deadbolts include:

  • Deadbolt Lock – Single Cylinder with removable thumb-turn
  • Deadbolt Lock – Classroom Function (thumb-turn only unlocks door)
  • Exit Only Function (no external cylinder)
  • Push-button Deadbolt Lock (mechanical or electrical)

Exit Only Function Deadbolt

Exit Only

Exit Only Deadbolt Lock

They must be put in correctly to work properly. A professional locksmith can accomplish this installation within couple of hours.

Double or Single Deadbolt Lock Cylinder?

Deadbolts come in both double and single cylinder models. A double cylinder deadbolt requires a key to operate the deadbolt from either side of the door. A single cylinder deadbolt can be locked or unlocked from inside by a thumb turn.
Single Cylinder Deadbolt

Single Cylinder Deadbolt

Double Cylinder Deadbolt Lock A double-cylinder door lock is a type of security device primarily found on residential doors. Homeowners often use these locks in conjunction with other types of security products, such as lever locks or handlesets. They can also be used as the primary locking mechanism on patio or balcony doors.

Double cylinder lock

Double Cylinder Deadbolt

A traditional single-cylinder deadbolt lock features a keyhole on the exterior side of the door and a thumbturn on the interior side. Homeowners can unlock these devices by either turning a key from outside, or by turning the thumbturn by hand from inside. Double-cylinder deadbolts have keyholes on both sides of the opening. They can be locked or unlocked only with a key, and no thumbturn is present. A variant of the standard deadbolt is the vertical deadbolt, invented by Samuel Segal. Vertical deadbolts resist jimmying, in which an intruder inserts a pry bar between the door and the jamb and attempts to pry the bolt out of the door. Vertical Deadbolt Lock

dead bolt vertical cylinder

Deadbolt Lock Cylinder

  • For Inswinging Doors
  • Heavy Cast Bronze Housing
  • Solid Brass Key Cylinder
  • Fits Doors from 1″ to 2-3/8″ (25 to 60 mm) Thick

The unique vertical locking action provides a Jimmy-Proof deadbolt for inswinging doors. To help provide you additional security and peace of mind Brooklyn Heights Locksmith carries a variety of door locks and deadbolts in different functions, styles, and security grades to fit your needs.

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