Fasteners are a fairly broad category of tools, such as screws, nuts, and bolts, that all serve the same purpose: to mechanically hold objects together. A fastener is a piece of hardware that is used to join or hold materials together as a non-permanent joint. Of course, glue can serve this purpose, but glue is not a type of fastener. As a result, we must expand our definition. Objects are held together mechanically by hardware fasteners. Fasteners typically form a non-permanent joint. In other words, if you use a fastener to connect two components, you can remove them without causing any damage to the separate pieces.
Fasteners play critical roles in the construction of a variety of objects. They aid in the retention of parts while preventing excessive vibration and pressure. There are numerous types of fasteners. There is also a fair amount of variation among the various types. Fasteners of various types include:
1. Bolts & Nuts
A bolt is a threaded fastener that is always used in conjunction with a nut. The External male thread is used for bolts, and the internal male thread is used for nuts. A bolt is made up of a head, a cylindrical body, and threads that run the length of it. Bolts typically have a flat head, which means that there is no grove on the head. It usually has a design on its periphery that allows it to be driven by a wrench tool, and the same is true for the nut.
These are the fasteners that produce their own threads as they fasten into the material. They typically have a head and a shank with helical threads. They have various head styles and recess or drive styles such as slotted, Pozidriv, Phillips, hex, Torx, Robertson, and so on (for more information, see the previous article).
These are thin plates, disc shapes with a hole in the middle, and the outer diameter is usually twice the inner diameter, which is used to distribute the load over which it is fastened, such as a screw or nut. In many applications, these can also be used as a spacer, locking device, wear pad, and so on. Depending on the application, it can be made of metal, plastic, or rubber.
It is a permanent fastener with a head, shank, and tail that cannot be disassembled without causing damage to the joints. Riveting is the process of joining two materials together by applying force, which can be done by hand or by power. They are extremely powerful in nature.
These are commonly used in the construction, masonry, and stone industries to connect structural and non-structural materials to concrete or other materials. This is typically installed by drilling a larger hole in the base material than the fastener diameter and then inserting the anchor into the hole to a depth known as embedment depth. Mechanical anchor fasteners and chemical anchor fasteners are the two most common types.
These are the strong threads that are typically cylindrical in shape and are used for a variety of purposes such as securing a long-lasting connection between various materials or repairing stripped threads. These are commonly used to distribute loads from a small diameter screw to a larger diameter insert.
7. Snap Rings
These are small metal rings that are broken at one end of a circle and have a grooved shape at the other end of the circle. They are used to hold and grip components onto a shaft while setting into a machined groove. They are commonly found in automobile engine parts, such as shock absorbers.
8. Clevis Pins and Cotter Pins
These are steel pins or a cylindrical shaft with a head. These are used to keep machine parts in precise position or alignment. They are made up of a hole in the shaft into which a cotter pin is inserted and bent to act as a staple.