The Essential Guide to Different Types of Bolts and Nuts

Bolts and nuts are essential fasteners used in various industries, construction, and everyday applications. They come in different types and configurations to suit specific needs. Here are some common types of bolts and nuts:


1. Hex Head Bolt: A bolt with a hexagonal head designed to be tightened or loosened with a wrench or socket.

2. Carriage Bolt: A bolt with a rounded, dome-shaped head and a square section under the head. It is often used in applications where a smooth, finished appearance is desired.

3. Eye Bolt: A bolt with a looped end, or eye, instead of a standard head. It is used to create attachment points for cables, ropes, or other fasteners.

4. U-Bolt: A bolt shaped like the letter “U,” with threads on both ends. U-bolts are used to secure pipes, rods, or other cylindrical objects to surfaces.

5. Anchor Bolt: A bolt embedded in concrete or masonry, usually with a hook or threaded end exposed above the surface. Anchor bolts provide a secure connection for structures or equipment.


1. Hex Nut: A six-sided nut with internal threads that mate with bolts or screws. Hex nuts are the most common type of nut and are tightened or loosened with a wrench or socket.

2. Wing Nut: A nut with two large wings protruding from opposite sides, allowing for hand-tightening without tools. Wing nuts are commonly used in applications that require frequent adjustment or removal.

3. Nyloc Nut: A hex nut with a nylon insert inside the threads. The nylon insert provides a locking feature that helps prevent the nut from loosening due to vibration.

4. Flange Nut: A nut with a wide circular flange at one end. The flange provides a larger bearing surface and can help distribute the load and prevent damage to the material being fastened.

5. T-Nut: A nut with a T-shaped cross-section, designed to fit into a T-slot or track. T-nuts are often used in woodworking or metalworking applications to create threaded attachment points.

These are just a few examples of bolts and nuts commonly used in various applications. It is important to select the appropriate type of bolt and nut based on factors such as the specific application, required strength, corrosion resistance, and other specific requirements.