> What are the parts of a bolt

What are the parts of a bolt

Many times the easiest way to start a project is having the knowledge what will be done and how it will proceed. If you are constantly doing locksmith work, you can be extremely beneficial know what are the parts of a bolt.

In many cases like maintenance, repair or change of locks; they talk about specific pieces and, it is necessary to know what they are referring to in order to avoid making mistakes or wasting time researching.

Therefore, we will teach you in a way short and easy the main elements of a lock; as well as its basic functions. Thus you will know how to recognize each piece in a simple and didactic way.

Locks: Models, types and characteristics

Before explaining what the parts of a lock are, it is essential that you know that in the world of locksmith there is a huge variety of lock models ranging from different prices, brands, sizes and shapes. Although, although there is a wide variety, we can include them in two types: mortise locks and rim locks.

The mortise locks are the most used by the population, due to the good level of quality and safety
that they are able to provide. Among its most notable features we have that, they are installed from inside the door, so they are invisible to the naked eye. In addition, they have a high degree of security; which guarantees protection against any potential problem.

This lock model is truly comfortable and easy to install. It also presents a good meaningful aesthetics, because it is invisible to the eye; so it won’t get in the way of the door design. We will only be able to observe the area in which the key and the handle are entered.

On the other hand, overlay locks
They are the ones that are placed on the door; that is, they remain fully visible and none of its parts need to enter the door. This quality makes them simple to install, due to its transversality.

Contrary to mortise locks, the overlay model it is not very aesthetic; because we can easily see the square lock on the door. Besides, his security level is lower to the previous model; Although it will also depend largely on the type of lock you have.

This model can be used perfectly, as
complementary lock in places with secured opening systems. Additionally, they have a high level of versatility; since they can be installed on any door regardless of the model.

Finally, it should be noted that a deadbolt and lock they are not the same; they only serve a common purpose. This is because the locks have elements in which we can enter our keys to make them turn, either to open or close. Whereas, the bolts have a crossbar chain that locks the door.

Regardless of the model that is finally installed, both are designed with the goal to keep the gates closed and make it as easy as possible for the owner to enter the property.

Lock Anatomy: Parts of a Hasp

Due to that there are many models of locks, some will have parts that others will not. Although in general, most have the following elements:

Knob or handle

This visible piece, generally elongated or round; allows us to interact directly with the lock. This is because when we turn the knob, if the key is not passed, the door will open without any impediment.

Keyhole or keyhole

It is the area in which we enter the key. Depending on the model, its location may vary, although it is usually near the handle or even inside the knob.


This piece is the metal plate that we can find on the side of the door, where the slip comes out. It is part of the opening system and in most cases, it is fastened with screws. It fulfills multiple functions, since it covers the cylinder and prevents the lock from being held.


If we stand on the side of the door, we will be able to see a piece go in and out when we manipulate the knob or turn the cylinder of the key; that’s the slip. Also known as the lock tongue, it is the part that prevents the door from opening when the key is turned. To retract it and finally open the door, we will have to move the handle towards the opening direction.


Also called paletones, they are the pieces that allow the door to open or remain locked. Which means that they are the elements that when we turn the key come out and enter the cavity located in the door frame; so when we turn the key in the opening direction, it retracts inside the lock so that it opens without problems.

This is one of the most important pieces of a lock; since it is in charge of providing us with security and privacy when passing the key. Additionally, this element is perfectly replaceable; so if it were to present a problem, we would only have to change it without having to modify the entire structure.


It is a metal plate located and attached to the lock; the slip and bolts are located in it.

Keys: Types and characteristics

In addition to the parts of a lock or the various models thereof, we would like to introduce you to the different types of keys that can be found on the market. In this way, in the event of any eventuality, you will know how to recognize them and work more efficiently:

Classic keys

Currently, these types of keys are no longer used due to how impractical, heavy and large they could be. Even so, we can still find places where they are still used as in old houses, castles, monasteries or even to open trunks.

Serreta keys

They are the most used in the world and will surely be the model you use at home. Each key has a specific teeth that corresponds to the configuration of the cylinder in which it fits; so it is rare to find two identical models in a small geographic area. Additionally, they are usually the keys used to open padlocks, lockers
or similar.

Pomp keys

These types of keys have teeth on both sides, so this is their most distinctive feature. They are usually used more frequently in high security locks such as those with anti-bumping, anti-pick, anti-extraction elements, among others. Although they can also be found in armored enclosures.

Paddle wrenches

Also known as bit, are made up of a central spike or bar and a lateral tooth. These are often used on armored doors or double-bit locks. Furthermore, the cylinder they enter is usually hidden from view; so they are really safe.

Cruciform keys

These keys they have a somewhat peculiar shape, being similar to a cross and a spiral at the same time. They are composed of a central pin with a certain level of length and with teeth that can vary depending on the lock.

The world of locksmithing is huge and beautiful, keep researching and expanding your knowledge of this profession full of surprises. If you want to expand your knowledge even more, do not hesitate to visit our article on the parts of a padlock.

Lock Part Names, Mike Explains Lock Part Names

Lock Part Names, Mike Explains Lock Part Names

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