Fasteners are hardware components used to join two or more objects together.

Common types of fasteners are:

SCREWS:

Screws are fasteners with a threaded shaft and a head that can be turned with a screwdriver.

They are used to hold objects together or to secure objects to a surface. Screws are smaller than bolts. Common types of screws are machine screws and self-tapping screws.

There are numerous types of screws available in the market, but here are some of the most commonly used types:

• Wood screws: These are designed for use in wood and have a pointed tip, a threaded body, and a tapered shank.
• Machine screws: These are used in machinery and have a straight, cylindrical shank with threads that run the full length of the screw.
• Sheet metal screws: These are used to attach thin sheets of metal to one another and have a sharp, pointed tip and a threaded body.
• Lag screws: These are used to attach heavy objects to wood or to secure wood to other materials, such as concrete or masonry.
• Self-tapping screws: These are designed to create their own threads as they are inserted and are commonly used in metal.
• Socket head cap screws: These have a cylindrical head with a recessed socket and are commonly used in machinery and electronics.
• Shoulder screws: These have a cylindrical head and a shoulder that separates the head from the threaded portion of the screw. They are commonly used in machinery.
• Set screws: These have no head and are threaded along their entire length. They are used to secure one object to another and are commonly used in machinery.
• Thumb screws: These have a large head that can be easily turned by hand and are commonly used in applications where frequent adjustments are required.
• Concrete screws: These are designed to attach materials to concrete and have a special thread design that allows them to grip the concrete securely.

BOLTS:  Bolts are fasteners with a threaded shaft and a head that requires a nut to hold it in place. They are typically used in applications where the joint needs to be disassembled later. The head of the bolts are generally hex head bolts.

NUTS:Nuts are fasteners with a threaded hole that fits onto a bolt or stud. They are used to secure the bolt or stud in place. The shape of a nut is typically hexagonal, with an internal thread used to mate with a bolt or screw for fastening.

STUD:Studs are fasteners with threads on both ends, used to secure objects together. 

WASHER: Washers are flat, circular metal or plastic discs with a hole in the center. They are used to distribute the load of a fastener over a larger area, and to prevent damage to the surface being fastened. Washers are typically used for assembly, isolation, cushioning, and shock absorption. Washers are a versatile engineering material that can play an important role in various everyday applications.

EYEBOLT:  Eye bolts: Eye bolts are fasteners with a loop or eyelet at one end, used to attach ropes or cables to an object. A lifting ring is typically a metal circular ring that can be used to hang and lift objects. Small lifting rings can be used to hang keychains or decorations, while larger lifting rings are used to mount machinery or lighting fixtures.

 In summary, fasteners are hardware components used to join objects together, and there are different types of fasteners for different applications. Screws and bolts are threaded fasteners, nuts and studs are used to secure them in place, washers are used to distribute the load, and eye bolts are used to attach ropes or cables.

Each screw has a different purpose, where and how to use it is a matter of knowledge.

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