Types of Bolts

The types of bolts available are mind-boggling. We rolled up our sleeves and categorized all types into an easy-to-read list. Most of us don’t spend much time thinking about bolts, but every appliance and gadget we own would fall apart without them.

The first bolt is thought to have been used around 400 BC. However, it took nearly 2,000 years for the bolt and its nut to be manufactured on a machine. A bolt is similar to a screw. Both have the same shape and are used to fasten materials together. The bolt is threaded and is designed to be used in conjunction with a nut. It is critical to ensure that the nut and bolt are the exact sizes to fit together correctly with no extra space.

There are various types of bolts to choose from. They are used differently depending on their shape, head type, and size. Continue reading to find out which type of bolt is best for you and your project.

Types of Bolts by: Shape and Head Type
Bolts are made up of a head and a cylindrical body with a threaded portion of their length (or shaft) (if it’s completely threaded, it’s a screw)

Anchor bolts
Anchor bolts allow objects to be linked to concrete, with the bolt head typically placed in the concrete before it has cured, exposing the threading end and making it ready for use.

The embedded end of cast-in-place bolts has a regular hexagonal bolt and washer, flange, or 90-bend, with the load-transfer mechanism in the mechanical interlock. Some post-installed anchors can be installed in concrete after it has been drilled.

Arbor bolts
The washer should be permanently attached, and the threading on these should be reversed. These are used in specific tools, such as mitre saws, to ensure that the blade does not fall out, and the tool remains safe.

Carriage bolts
Carriage bolts, also known as round head square neck bolts, are used to secure metal to wood. These have a smooth rounded head and a square section that prevents the bolt from turning; they also have a threaded area for a nut. Usually, there is some strengthening.

Hex bolts
Hex bolts have a threaded body and a hexagonal head. The section directly beneath the head may not be threaded.

J-bolts
They are shaped like the letter J and are used for tie-downs, assisting in holding down materials or equipment to keep it safe.

Lag Bolts
Also known as lag screws, these aren’t bolts and have a hex bolt head and thread screw tip, allowing them to be used in wood materials.

Rock Bolts
Assist in the stabilization of tunnel walls.

Stripper bolts or shoulder bolts
Assist in the formation of a pivot or attachment point. They have a wide smooth shoulder and a small threaded end.

U-bolts
The two straight sections are threaded and shaped like the letter U.

Types of Bolts by: Shape and Usage
Bolts can also be distinguished by their shapes and applications.

Hex Bolts
These are among the most common fasteners and will be used as standard bolt-in many projects. The hex head bolt has more strength than the square bolt, is easier to assemble, torque application is simpler, and more space for the manufacturer’s identification.

Bent Bolt
Bent bolts, unlike most traditional bolts, are not straight. The end is bent or shaped to meet specific needs, such as a right-angle bend or an eye shape.

Carriage Bolts
These are designed to look good, with a rounded head that is more aesthetically pleasing. The bolt’s body is threaded typically, but some ribs or flats prevent the bolt from turning once tightened when you reach the shank. Some carriage bolts are pressed into place, while others have a square hold that has been pre-punched.

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