A Door Lock is a mechanical or electronic device that is used to secure a door in a closed position, preventing unauthorized entry. Door lock work by using a mechanism, such as a key, a combination, or a thumb turn, to move a bolt or latch into a locked position. This prevents the door from being opened until the lock is unlocked using the appropriate mechanism.

The history of door locks can be traced back to ancient civilizations. The earliest known door lock was found in the ruins of the palace of Khorsabad in Mesopotamia and is believed to date back to 704 BC. These early locks were simple wooden bolts that were secured with a wooden key. Over time, locks became more sophisticated, with the use of metal, the introduction of tumblers and pins, and the development of key-operated locks. In the 19th century, the invention of the cylinder lock, which uses a rotating cylinder to operate the lock, made mass production of locks possible. Today, door locks come in a wide variety of styles and designs, including electronic locks that use keypads or biometric technology to open.

What are the most secure types of door locks?

The most secure types of door locks are the deadbolts, smart locks, and high-security locks. Deadbolts are considered the most secure because they are difficult to pick, bump, or drill. Smart locks use advanced technology and can be controlled with a smartphone or a code, and high-security locks have additional security features such as drill-resistant plates and patented keys.

What should you do if you lose all the keys to a lock?

If you lose all the keys to a lock, it can be a frustrating and potentially costly situation. One option is to hire a locksmith, who can use specialized tools to pick the lock or open it without damaging the lock. However, if you do not have any spare keys and are unable to access the locked space, you may need to replace the lock entirely. This can be more expensive than hiring a locksmith, but it will give you new keys to use. As a last resort, you can drill the lock, however this can damage the lock and make it unusable, but it will allow you access.

Why are door chain locks still used?

Door chains are still used for safety and security, privacy, convenience, cost-effectiveness and aesthetics. They provide an additional layer of security, allowing a person to open the door slightly to see who is outside without fully opening it, they can be useful for people with mobility issues, and they can add an aesthetic touch to a home.

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Door Locks Guides
Browse through our curated Door Locks Guides for additional categorizations, tips, details, variations, styles, and histories of Door Locks. Guides provide additional insights into the unique properties and shared relationships between elements.
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1.3” | 33 mm (Plate)
.63”, 2.52” | 16, 64 mm
.59” | 15 mm
Barrel Bolt Lock
3.300
6.400
1.500
3100
https://p3d.in/e/NurYn
GUIDE
3D
Barrel Bolt LockPerspective view of a 3D model of a Barrel Bolt LockPerspective view of a 3D model of a Barrel Bolt Lock
3” | 76 mm
2.8” | 71 mm
.53” | 13.5 mm (Front)
Deadbolt Lock - Arched, Round Cylinder
7.600
7.100
1.350
5
https://p3d.in/e/WAgq7
GUIDE
3D
Deadbolt Lock - Arched, Round CylinderPerspective view of a 3D model of a Deadbolt Lock (Arched, Round Cylinder)Perspective view of a 3D model of a Deadbolt Lock (Arched, Round Cylinder)
2.48” | 63 mm (Diameter)
2.48” | 63 mm (Diameter)
.53” | 13.5 mm (Front)
Deadbolt Lock - Cylinder, Round Cylinder
6.300
6.300
1.350
500
https://p3d.in/e/wzqTu
GUIDE
3D
Deadbolt Lock - Cylinder, Round CylinderView of a Deadbolt Lock (Cylinder, Round Cylinder) in 3D available for downloadView of a Deadbolt Lock (Cylinder, Round Cylinder) in 3D available for download
2.64” | 67 mm (Diameter)
2.64” | 67 mm (Diameter)
.79” | 20 mm (Front)
Deadbolt Lock - Round, Euro Cylinder
6.700
6.700
2.000
30
https://p3d.in/e/PU5Xb
GUIDE
3D
Deadbolt Lock - Round, Euro Cylinder3D model of a Deadbolt Lock (Round, Euro Cylinder) viewed in perspective3D model of a Deadbolt Lock (Round, Euro Cylinder) viewed in perspective
2.64” | 67 mm (Diameter)
2.64” | 67 mm (Diameter)
.79” | 20 mm (Front)
Deadbolt Lock - Round, Oval Cylinder
6.700
6.700
2.000
30
https://p3d.in/e/hgsA5
GUIDE
3D
Deadbolt Lock - Round, Oval CylinderPerspective view of a 3D model of a Deadbolt Lock (Round, Oval Cylinder)Perspective view of a 3D model of a Deadbolt Lock (Round, Oval Cylinder)
2.64” | 67 mm (Diameter)
2.64” | 67 mm (Diameter)
.79” | 20 mm (Front)
Deadbolt Lock - Round, Round Cylinder
6.700
6.700
2.000
30
https://p3d.in/e/NwfFj
GUIDE
3D
Deadbolt Lock - Round, Round CylinderView of a Deadbolt Lock (Round, Round Cylinder) in 3D available for downloadView of a Deadbolt Lock (Round, Round Cylinder) in 3D available for download
2.64” | 67 mm
2.64” | 67 mm
.79” | 20 mm (Front)
Deadbolt Lock - Square, Euro Cylinder
6.700
6.700
2.000
90
https://p3d.in/e/cpnvG
GUIDE
3D
Deadbolt Lock - Square, Euro Cylinder3D model of a Deadbolt Lock (Square, Euro Cylinder) viewed in perspective3D model of a Deadbolt Lock (Square, Euro Cylinder) viewed in perspective
2.64” | 67 mm
2.64” | 67 mm
.79” | 20 mm (Front)
Deadbolt Lock - Square, Oval Cylinder
6.700
6.700
2.000
90
https://p3d.in/e/8LqWy
GUIDE
3D
Deadbolt Lock - Square, Oval CylinderPerspective view of a 3D model of a Deadbolt Lock (Square, Oval Cylinder)Perspective view of a 3D model of a Deadbolt Lock (Square, Oval Cylinder)
2.64” | 67 mm
2.64” | 67 mm
.79” | 20 mm (Front)
Deadbolt Lock - Square, Round Cylinder
6.700
6.700
2.000
90
https://p3d.in/e/ACxIE
GUIDE
3D
Deadbolt Lock - Square, Round CylinderView of a Deadbolt Lock (Square, Round Cylinder) in 3D available for downloadView of a Deadbolt Lock (Square, Round Cylinder) in 3D available for download
3.31” | 84 mm
2.58” | 65.5 mm
.59” | 15 mm (Front)
Deadbolt Lock - Traditional, Round Cylinder
8.400
6.550
1.500
5
https://p3d.in/e/9BzPp
GUIDE
3D
Deadbolt Lock - Traditional, Round Cylinder3D model of a Deadbolt Lock (Traditional, Round Cylinder) viewed in perspective3D model of a Deadbolt Lock (Traditional, Round Cylinder) viewed in perspective
1.34”, 2.13” | 34, 54 mm (Plates)
.75”, 3.35” | 19, 85 mm
.65” | 16.5 mm
Door Chain Lock
5.400
8.500
1.650
7400
https://p3d.in/e/P8PQt
GUIDE
3D
Door Chain LockView of a Door Chain Lock in 3D available for downloadView of a Door Chain Lock in 3D available for download
1.81” | 46 mm
.63”, 2.72” | 16, 69 mm
.85” | 21.5 mm
Slide Bolt Lock
4.600
6.900
2.150
90
https://p3d.in/e/Q2O2F
GUIDE
3D
Slide Bolt Lock3D model of a Slide Bolt Lock viewed in perspective3D model of a Slide Bolt Lock viewed in perspective
Deadbolt Lock - Round, Oval Cylinder
Style and size comparison drawing of the Deadbolt Lock (Round, Oval Cylinder) compared to other door lock designs

The Deadbolt Lock (Round, Oval Cylinder) is a contemporary door lock featuring a circular base plate and a raised Oval cylinder. In general, deadbolt locks are a type of door lock that use a bolt to secure the door in a closed position. The bolt is operated by a thumb turn or a key and is separate from the lock mechanism. The lock mechanism typically has a cylindrical shape and contains a mechanism that connects to the bolt. The lock is engaged by extending the bolt into a receptacle on the door frame making it more secure and harder to defeat by picking or drilling than other types of locks.

The Deadbolt Lock (Round, Oval Cylinder) has a diameter of 2.64” (67 mm), front depth of .79” (20 mm), and latch depth of 1.06” (27 mm).

Set of scaled dimensioned drawings of the Deadbolt Lock (Round, Oval Cylinder) viewed from the front, side and top
The Deadbolt Lock (Round, Oval Cylinder) is a contemporary door lock featuring a circular base plate and a raised Oval cylinder. In general, deadbolt locks are a type of door lock that use a bolt to secure the door in a closed position. The bolt is operated by a thumb turn or a key.

The Deadbolt Lock (Round, Oval Cylinder) has a diameter of 2.64” (67 mm), front depth of .79” (20 mm), and latch depth of 1.06” (27 mm).

Set of scaled dimensioned drawings of the Deadbolt Lock (Round, Oval Cylinder) viewed from the front, side and top
Deadbolt Lock - Round, Oval Cylinder
Height:
2.64” | 67 mm (Diameter)
Width:
2.64” | 67 mm (Diameter)
Length:
Depth:
.79” | 20 mm (Front)
Weight:
Area:

Depth (Latch): 1.06” | 27 mm

Materials
Brass
Designer

Drawings include:

Deadbolt Lock (Round, Oval Cylinder) front elevation, side, doors (front)

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Deadbolt Lock - Square, Round Cylinder
Scale illustration of the Deadbolt Lock (Square, Round Cylinder) compared to other door locks

The Deadbolt Lock (Square, Round Cylinder) is a modern door lock consisting of a square base plate and a second raised plate holding a standard round cylinder. In general, deadbolt locks are a type of door lock that use a bolt to secure the door in a closed position. The bolt is operated by a thumb turn or a key and is separate from the lock mechanism. The lock mechanism typically has a cylindrical shape and contains a mechanism that connects to the bolt. The lock is engaged by extending the bolt into a receptacle on the door frame making it more secure and harder to defeat by picking or drilling than other types of locks.

The Deadbolt Lock (Square, Round Cylinder) has a height of 2.64” (67 mm), width of 2.64” (67 mm), front depth of .79” (20 mm), and latch depth of 1.06” (27 mm).

Pair of dimensioned illustrations of the Deadbolt Lock (Square, Round Cylinder) seen from the side and elevation views
The Deadbolt Lock (Square, Round Cylinder) is a modern door lock consisting of a square base plate and a second raised plate holding a standard round cylinder. In general, deadbolt locks are a type of door lock that use a bolt to secure the door in a closed position.

The Deadbolt Lock (Square, Round Cylinder) has a height of 2.64” (67 mm), width of 2.64” (67 mm), front depth of .79” (20 mm), and latch depth of 1.06” (27 mm).

Pair of dimensioned illustrations of the Deadbolt Lock (Square, Round Cylinder) seen from the side and elevation views
Deadbolt Lock - Square, Round Cylinder
Height:
2.64” | 67 mm
Width:
2.64” | 67 mm
Length:
Depth:
.79” | 20 mm (Front)
Weight:
Area:

Depth (Latch): 1.06” | 27 mm

Materials
Brass
Designer

Drawings include:

Deadbolt Lock (Square, Round Cylinder) front elevation, side, doors (front)

Details & Downloads

Downloads

2D Downloads

3D Downloads

Slide Bolt Lock
Comparison drawing of the Slide Bolt Lock compared to similar door lock sizes and shapes

A Slide Bolt Lock, a flattened variation of the ‘Barrel Bolt Lock’, is a type of door lock that consists of a metal bolt that slides into a receptacle, or "strike plate," on the door frame to secure the door in a closed position. The lock mechanism is typically a simple design, which consists of a flat metal bolt that is housed within a metal sleeve. The barrel is attached to the door and the bolt is extended or retracted by turning a knob or key. The lock itself is a mechanical device and can be simple, but provides a secure locking mechanism that can be used in a variety of applications. The slide bolt lock is a cost-effective solution for securing a door, as it can be installed easily and do not require complex mechanisms.

The Slide Bolt Lock has a height of 1.81” (46 mm), plate widths of .63”, 2.72” (16, 69 mm), and depth of .85” (21.5 mm).

Scaled set of drawings of the Slide Bolt Lock in front and side views with dimensions
A Slide Bolt Lock, a flattened variation of the ‘Barrel Bolt Lock’, is a type of door lock that consists of a metal bolt that slides into a receptacle, or "strike plate," on the door frame to secure the door in a closed position.

The Slide Bolt Lock has a height of 1.81” (46 mm), plate widths of .63”, 2.72” (16, 69 mm), and depth of .85” (21.5 mm).

Scaled set of drawings of the Slide Bolt Lock in front and side views with dimensions
Slide Bolt Lock
Height:
1.81” | 46 mm
Width:
.63”, 2.72” | 16, 69 mm
Length:
Depth:
.85” | 21.5 mm
Weight:
Area:
Materials
Stainless steel
Designer

Drawings include:

Slide Bolt Lock front elevation, side, doors (front)

Details & Downloads

Downloads

2D Downloads

3D Downloads

Door Chain Lock
Scale illustration of the Door Chain Lock compared to other door locks

A Door Chain Lock is a type of lock that consists of a chain and a bracket that is mounted on the door. The chain is connected to the bracket and is used to secure the door in a partially open position. The chain is typically made of metal and is attached to a bracket that is mounted on the door. When the door is closed, the chain is secured to the bracket, preventing the door from being opened more than the length of the chain. The chain lock is typically used in conjunction with a main door lock, such as a deadbolt, and it is usually installed on the inside of the door, allowing the person inside the building to open the door slightly to see who is outside without fully opening it.

The Door Chain Lock has plate heights of 1.34”, 2.13” (34, 54 mm), plate widths of .75”, 3.35” (19, 85 mm), and depth of .65” (16.5 mm). The overall height of the Door Chain Lock including the hanging chain is roughly 4.33” (110 mm).

Pair of dimensioned illustrations of the Door Chain Lock seen from the side and elevation views
A Door Chain Lock is a type of lock that consists of a chain and a bracket that is mounted on the door. The chain is connected to the bracket and is used to secure the door in a partially open position. The chain is typically made of metal and is attached to a bracket that is mounted on the door.

The Door Chain Lock has plate heights of 1.34”, 2.13” (34, 54 mm), plate widths of .75”, 3.35” (19, 85 mm), and depth of .65” (16.5 mm). The overall height of the Door Chain Lock including the hanging chain is roughly 4.33” (110 mm).

Pair of dimensioned illustrations of the Door Chain Lock seen from the side and elevation views
Door Chain Lock
Height:
1.34”, 2.13” | 34, 54 mm (Plates)
Width:
.75”, 3.35” | 19, 85 mm
Length:
Depth:
.65” | 16.5 mm
Weight:
Area:

Height (Overall): 4.33” | 110 mm

Materials
Stainless steel
Designer

Drawings include:

Door Chain Lock front elevation, side, doors (front)

Details & Downloads

Downloads

2D Downloads

3D Downloads

Deadbolt Lock - Arched, Round Cylinder
Style and size comparison drawing of the Deadbolt Lock (Arched, Round Cylinder) compared to other door lock designs

The Deadbolt Lock (Arched, Round Cylinder) is a unique door lock featuring arched top and bottom edges and a standard round cylinder. In general, deadbolt locks are a type of door lock that use a bolt to secure the door in a closed position. The bolt is operated by a thumb turn or a key and is separate from the lock mechanism. The lock mechanism typically has a cylindrical shape and contains a mechanism that connects to the bolt. The lock is engaged by extending the bolt into a receptacle on the door frame making it more secure and harder to defeat by picking or drilling than other types of locks.

The Deadbolt Lock (Arched, Round Cylinder) has a height of 3” (76 mm), width of 2.8” (71 mm), front depth of .53” (13.5 mm), and latch depth of 1.22” (31 mm).

Set of scaled dimensioned drawings of the Deadbolt Lock (Arched, Round Cylinder) viewed from the front, side and top
The Deadbolt Lock (Arched, Round Cylinder) is a unique door lock featuring arched top and bottom edges and a standard round cylinder. In general, deadbolt locks are a type of door lock that use a bolt to secure the door in a closed position. The bolt is operated by a thumb turn or a key.

The Deadbolt Lock (Arched, Round Cylinder) has a height of 3” (76 mm), width of 2.8” (71 mm), front depth of .53” (13.5 mm), and latch depth of 1.22” (31 mm).

Set of scaled dimensioned drawings of the Deadbolt Lock (Arched, Round Cylinder) viewed from the front, side and top
Deadbolt Lock - Arched, Round Cylinder
Height:
3” | 76 mm
Width:
2.8” | 71 mm
Length:
Depth:
.53” | 13.5 mm (Front)
Weight:
Area:

Depth (Latch): 1.22” | 31 mm

Materials
Brass
Designer

Drawings include:

Deadbolt Lock (Arched, Round Cylinder) front elevation, side, doors (front)

Details & Downloads

Downloads

2D Downloads

3D Downloads

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