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Fasteners are hardware devices used to securely join or affix two or more objects together. They play a crucial role in construction, manufacturing, and various other industries. Fasteners are designed to provide mechanical strength, stability, and ease of assembly and disassembly. They come in a wide range of types, sizes, and materials to suit different applications and requirements.

Here are some common types of fasteners:

1. Screws: Screws are threaded fasteners with a helical ridge that enables them to be rotated into a threaded hole or material. They typically have a pointed end and require a corresponding driver (such as a screwdriver or drill) to be inserted and tightened. Screws come in various head types (flat, round, pan, etc.) and are used to hold objects together or to fasten objects to a surface.

2. Bolts: Bolts are similar to screws, but they are typically larger and have a non-threaded portion called the shank. Bolts require a nut to be fastened securely. They are often used in applications where high strength and load-bearing capacity are required.

3. Nuts: Nuts are internally threaded fasteners designed to be used with bolts or threaded rods. They are typically hexagonal in shape and are tightened onto the corresponding bolt to secure objects together.

4. Washers: Washers are flat, disc-shaped fasteners used in conjunction with nuts and bolts. They help distribute the load and prevent damage to the surface or provide insulation or spacing between components.

5. Rivets: Rivets are permanent fasteners that are inserted into holes and deformed to secure two or more materials together. They are often used in applications where welding or screwing is not possible or desirable.

6. Anchors: Anchors are fasteners used to provide a secure attachment point in materials like concrete, masonry, or drywall. They expand or engage with the material to create a stable connection.

7. Clips and Clamps: Clips and clamps are fasteners used to hold objects together or secure them to a surface. They often have a spring-like mechanism or a locking mechanism to provide grip and tension.

8. Nails: Nails are slender, pointed fasteners typically used for securing wood or other materials. They are hammered or driven into the material, and their shape and design provide a secure hold.

9. Hooks and Eyelets: Hooks and eyelets are fasteners that form a loop or attachment point for hanging or connecting objects. They are often used in applications such as hanging curtains, securing chains, or fastening garments.

Fasteners can be made from various materials, including steel, stainless steel, aluminum, brass, and plastic. The choice of material depends on factors such as strength requirements, corrosion resistance, and the environment in which the fasteners will be used.

It's important to select the appropriate fastener type, size, and material for the specific application to ensure proper fit, strength, and durability. 

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