Bolt, a mechanical fastener is typically used to attach two or more pieces to a nut. Bolt joints can be quickly disassembled and reassembled; therefore, bolts or screw fasteners are used for a greater degree than any other mechanical fastener. It plays a significant role in producing mass-produced products and steel structures.

Unlike screws, which cut their threads, bolts pair with the internal threads of nuts to stay in place and ensure the desired level of tension in the bolted joint. The use of nuts aids in disassembly and reassembly. Also, It usually have a higher load-bearing capacity than screws, but It does not have a tapered shaft.

The head style of the bolt determines the tool required for tightening and loosening. It is responsible for holding together everything from furniture to machinery to bridges.

Types of Bolts:

Carriage bolts: It feature a domed or countersunk head with a square underside that prevents turning post-installation. They are often used with wood and masonry.

Flange bolts: These are a specialized type of hex head bolt that has an integrated flange that serves as a washer component to more evenly distribute the load.

Plow bolts: Similar to carriage bolt, some plow bolts have a square-shaped countersunk top. Others have a domed design. These are suitable for heavy-duty applications such as industrial machinery.

Hex head bolts/ Hex Head Cap Screw: Characterized by their hexagonal head shape, They are a broader category of bolt that requires installation with a wrench. They are available in many lengths and threading varieties. Hex Head Cap Screws have tighter tolerances and are the most common Hex Bolt category.

Square Head bolt: Like hex head bolts, square head bolt are defined by their head shape—i.e., square. This head design facilitates tooling gripping, allowing for easier installation.

Socket Head Cap Screws/ Allen bolt: Socket head cap screws have a flat chamfered top surface with smooth or knurled cylindrical sides. Forged heat-treated alloy examples are high strength fasteners designed for the most demanding mechanical applications, with different alloy formulations.