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A bolt is a type and form of fastener that is usually made from metal. It often has a head on one end, a channel at the other, as well as a shaft with an outer helical ridge, known simply as a ‘thread.’ Bolts, serve to hold material together or position objects.

The chamfer on the head at the opposite end provides slightly beveled edges that allow for the inserting of the bolt and nuts. Bolts usually require nuts, which are applied via torque. The bolt must be held in position or vice versa. Vibration and dynamic loads can cause nuts to become loose. Locknuts, lock washers, or thread lockers may be required to prevent this from happening.

Bolts & screws

Sometimes, the terms ‘bolts’ and’ screws are used interchangeably. While the distinction between them can seem complicated, a bolt can pass through the materials it’s fixing together (typically into the nut at the opposite side), while a threaded screw goes directly into them.

Bolts are typically made of steel. If corrosion or weather resistance is required, they can either be galvanized or stainless, brass, zinc, or titanium.

Types Of Bolt

Many bolt types can be used depending on the materials required. These are some of the most popular types:

Anchor bolt

Typically embedded in concrete, masonry to support applications.

Carriage bolt

It is used to attach metal or timber to metal. The head has a square undercut which helps to hold the bolt in place once it is tightened.

Elevator bolt

An elevator bolt is used to attach conveyor systems. It has a flat head, plain or countersunk that holds the bolt in its place when it is tightened.

Flange bolt

This type of bolt, also known as frame bolts or bolts with a washer at the undercut of its head, distributes the bearing load.

Hanger bolt

This bolt comes with two threaded ends, instead of a header. The other has a wood screw.

Hexagon bolt/Tap bolt

A hexagon bolt consists of a head-on six sides with threading that goes part-way down the shank. In contrast, a tap bolt’s shank has threading running the length of the bolt.

Huck bolt

A unique bolt where the pin is joined to the collar using a specialist tool. This creates a permanent fixing.

Lag bolt

Also known as “lag screws”, this fastener is heavy-duty and creates its mating thread in wood and other soft materials once it’s tightened.

Silicon Bronze Machine Bolts

Silicon Bronze Machine Bolts have a shorter shank and can be used to assemble parts through predrilled holes.

Plow bolt

This type is often used in construction tools.

Squarehead bolt

This machine bolt is very similar in that it has a short shaft and a four-sided bolt head.

Stud bolt

This bolt is made with hexagon nuts on both ends. components are fastened between bolts.

T-head bolt

A T-shaped head can be easily gripped by a Wench and fits into a slot.

Toggle bolt

This type of bolt features an expanding wing-like nut, which allows it to mount items to walls.


Similar to staples but bent like a U, the U- bolts can be threaded on one end and partially threaded on the other.

Bolt heads

You can choose from different types of heads.

Square shoulder: A square truss head. This allows fastening to occur with the least surface obstruction. The shank, which resists rotation, also has a square shank.

Indented hexagon: This head is suitable for use with a wrench. The top of the head features a circular depression.

Indented Hexagon washer This washer is the same as an indented hazelnut, but it has a washer Section at the base to protect the assembly HTML3_ from the wrench.

Hexagon (trimmed ): Standard type head. It has clean corners and is trimmed to tolerances.

Hexagon flange – Similar to the indented hexagon washer but the washing machine is either conical or slightly rounded.


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