Discover the key differences between nut vs bolt in this comprehensive guide. Learn how these essential fasteners work together, their various types, and their specific applications in construction, machinery, and everyday use.

What are Bolts?

A bolt is a type of fastener having an outside threaded circular rod designed to be used with a nut. washer to join two or more parts. Unlike screws, which create their own thread in the material, bolts require a nut to fasten securely. They are inserted through pre-drilled holes in the parts being joined and then tightened with a nut on the opposite side.

Types of Bolts

Sl No.	Type	Diagram	Description	Applications
1	Anchor Bolt		A bolt with a threaded portion at one end and a non-threaded, eye-shaped head at the other end. Usually comes with a washer and nut, and is rust-resistant.	Used for setting light poles and fastening equipment to concrete bases.
2	Carriage Bolt		Fully threaded with a smoothly formed head and a square or ribbed undercut to prevent rotation during tightening.	Used for fastening wood to metal.
3	Eye Bolt		A fastener with a rod-shaped body and a loop at one end.	Commonly used in lifting applications for heavy-duty service.
4	Hanger Bolt		Headless bolt with threads on both ends; one end is shaped like a wood screw.	Used in overhead, elevated applications for fastening wood and rods.
5	Hex Bolt		Bolt with a six-sided head, available either fully or partially threaded.	Widely used in construction and repair of buildings and highway elements.
6	Square Head Bolt		Features a square head and a smooth shank, with fully or partially threaded options. Easier to grip with a wrench during tightening.	Used in industrial, agricultural, and construction applications.
7	U-Bolt		Shaped like the letter “U” with threads on both ends.	Used for supporting pipework.
8	Lag Bolt		Tough fasteners that create their own threads when penetrating wood and other soft materials.	Connecting heavy materials that bear extreme loads.
9	Flange Bolt		Has a circular, washer-like flange under the head to distribute clamping force.	Used in vehicles to secure engines and transmission systems, and in piping systems to hold flange pipes together.
10	Serrated Flange Bolt		Similar to standard flange bolts but with teeth on the flange to grip surfaces and resist vibration.	Used in mechanical and plumbing applications, and electronic product casings.
11	Plow Bolt		Similar to carriage bolts but with countersunk heads and a square neck.	Used in heavy equipment like snowplows, tractors, excavators, and scoop shovels.
12	Socket Head Bolt		Features a recessed slot in the head for an Allen wrench or socket tool.	Used in industrial production and assembly lines.
13	Stud Bolt		Headless bolts with threads on both ends of the shaft, either fully threaded or partially threaded.	Connecting equipment parts and permanent fixtures.

What are Nuts?

A nut is a type of fastener featuring a threaded hole, specifically designed to be used with a bolt to securely join multiple parts. The assembly is held together by the friction between the threads of the nut and bolt, as well as the slight stretching of the bolt and the compression of the parts being fastened. This combination ensures a strong and stable connection.

Differences Between Nuts and Bolts