ThePipingMart Blog Fasteners 3 Types of Hex Bolt and Their Uses

3 Types of Hex Bolt and Their Uses

Hex Bolt

Hex bolts are one of the most common types of fasteners used in construction, automotive, and general maintenance projects. They come in a wide variety of sizes and styles, and it’s important to understand the differences between each type to determine which is best for your project. Let’s take a look at the different types of hex bolts available.

Types of Hex Bolt

Carriage Bolt

Carriage bolts have a domed head with a square shoulder underneath. This head allows them to be used with wood; when installed, the head sits flush against the surface while the square shoulder prevents them from turning or being pulled out. The smooth, dome-shaped head also makes carriage bolts aesthetically pleasing, so they are often used where strength is not a major consideration.

Hex Machine Bolt

Hex machine bolts are similar to carriage bolts but are made from different materials that give them greater strength and resistance to corrosion. They have coarse threads that run along their entire length, so they can provide more holding power than carriage bolts when used with materials like steel or aluminium. However, this also means they require pre-drilling into hard materials since their threads will cause them to bind up if they’re screwed straight in.

Cap Screw

Cap screws have a hexagonal head with a flat bottom that sits flush against the surface when installed. They are usually made from stainless steel or other strong metals, making them ideal for use in high-stress applications like automotive parts or machine components where strength is critical. Cap screws also have fine threads along their shank that allow them to secure firmly into hard materials without pre-drilling.


Hex bolts come in many shapes and sizes, so it’s important to understand each type before selecting one for your project. Carriage bolts offer aesthetic appeal, while machine bolts provide more holding power due to their coarse threading design. For high-stress applications, cap screws are usually the best option due to their superior strength and ability to securely fasten without pre-drilling into hard surfaces such as metal or concrete. Whatever your specific needs may be, there is sure to be a hex bolt type that suits them perfectly!

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