Deadbolts provide maximum security to a door. They are named as deadbolts as no spring is required to operate them. These bolts are operated manually with a key or thumb turn from the inner side. Deadbolts lock the door to the frame and prevents someone trying to open the door. They are frequently used on external doors for security purposes.
Deadbolts are designed in such a way so that fit specific size holes and backsets. Backset is actually the distance between the edge of the door and center of the handle. Deadbolt usually extends to a greater depth into the door frame and they cannot be retracted automatically. They need to be manipulated with a lock on the outside and either a latch or lock on the inside.

Materials used in Deadbolts

Deadbolts are usually made of metals and metal alloys. Some of the commonly used material include:

• Stainless Steel
• Brass
• Bronze

Polished brass finish and black antique finishes are available with deadbolts.
Types of Deadbolts
Deadbolts are usually of two types:

• Single-cylinder deadbolt: They are operated with a key from outside and a turn button on the inside. Single-cylinder deadbolts are mostly used with solid metal and wood doors.
• Double-cylinder deadbolt: This type of deadbolt is operated with a key from both inside and outside. It is most suitable for doors with glass in or around them. The style of the deadbolt prevents someone from breaking the glass, entering inside and unlocking the door. However, these deadbolts can pose a danger during an emergency. In case the key is missing or not readily available, people could be trapped inside a locked house.