Fasteners are hardware devices used to join or secure two or more objects together. They are commonly used in construction, manufacturing, automotive, and various other industries. Fasteners come in a wide range of shapes, sizes, and materials to accommodate different applications and requirements. Some common types of fasteners include:

1. Bolts: Bolts are threaded fasteners with a head on one end and a threaded shaft on the other. They are inserted through aligned holes in objects and secured with a nut on the threaded end. Bolts provide strong and reliable fastening for heavy-duty applications.

2. Nuts: Nuts are internally threaded fasteners that are used in conjunction with bolts or threaded rods. They are tightened onto the threaded portion of a bolt to create a secure connection. Nuts come in various shapes, such as hexagonal, square, or round, and are available in different materials and sizes.

3. Screws: Screws are threaded fasteners that are designed to be inserted into a pre-drilled hole or self-tapped into the material. They have a sharp pointed end for easy insertion and a threaded shaft for secure fastening. Screws come in different head types, such as flat head, round head, or countersunk head, and are commonly used in woodworking, construction, and assembling.

4. Washers: Washers are thin, flat, and usually circular discs with a hole in the center. They are placed between the fastener (such as a bolt or nut) and the surface of the object being fastened. Washers distribute the load, provide a smooth surface, and help prevent damage to the object or the fastener.

5. Rivets: Rivets are permanent fasteners used to join two or more pieces of material together. They consist of a cylindrical shaft with a head on one end and are inserted into pre-drilled holes. The opposite end is then deformed or "riveted" to secure the joint. Rivets are commonly used in applications where a strong and vibration-resistant connection is required, such as in aircraft construction or structural metalwork.

6. Anchors: Anchors are fasteners used to secure objects to surfaces that cannot support the weight or force being applied. They provide stability and strength by expanding or gripping into the material they are inserted into. Anchors are commonly used in construction for securing objects to walls, ceilings, or floors.

7. Pins: Pins are slender and cylindrical fasteners used for aligning or securing two or more parts together. They come in various forms, such as straight pins, dowel pins, or split pins. Pins are often used in mechanical assemblies or to prevent rotation or movement of components.

8. Clips and Clamps: Clips and clamps are fasteners used to hold or secure objects together. They can be spring-loaded, hinged, or adjustable, and are commonly used in automotive, electrical, or plumbing applications.

These are just a few examples of the numerous types of fasteners available. The choice of fastener depends on factors such as the application, load requirements, material compatibility, and environmental conditions. Selecting the appropriate fastener is crucial to ensure a secure and reliable connection between objects.