What are Fasteners & Types of Fasteners?
Fasteners are a type of mechanical part that is used for fastening connections and are widely used. Fasteners are used in a wide range of industries, including energy, electronics, electrical appliances, machinery, chemicals, metallurgy, molds, hydraulics, etc., in various machinery, equipment, vehicles, ships, railways, bridges, buildings, structures, tools, and instruments. , chemical industry, instruments, supplies, etc., all kinds of fasteners can be seen, which are the most widely used mechanical basic parts. It is characterized by a wide variety of specifications, different performance, and uses. types of fasteners include screws and bolts. nuts, washers, rivets, pins, etc. Each of these different types of fasteners is a category unto itself, with many types to choose from.
When we talk about types of fasteners, first we will think screws, Screws are metal fasteners that have a threaded shank, which is driven by turning. The threads prevent the screw from pulling out. Their threaded shafts give them durable holding power, and unlike a bolt, they don’t require anything to hold them in place. Screws include the below types
- Machine screws are typically designed with finer, more accurate threads than alternative fastener types. They are generally intended for use with a pre-drilled interior tapped hole or a nut. Machine screws are most often used for fastening metal parts securely together in various types of machinery or construction
- Security screws, also known as tamperproof screws, are otherwise standard screws but with a unique head, making it nearly impossible to remove with common tools. That used to mean that any screws that couldn’t be removed with a slot-style or Phillips® head driver could be considered security screws.
- SEMS Screws are a bolt combination with a permanently attached washer or set of washers. It is also referred to as captivated washers, screw/bolt-washer assemblies, or combi bolts. , which made machines that produced pre-as SEMbled washers and screws.
- Chicago screws, which are also known as Chicago Fasteners, Chicago Bolts, Sex Bolts, Screw Posts, Tee-Nuts, and Binding Posts, take the place of the permanently sewn-on thread and allow you to swap out different belt buckles with the same leather strap.
- Weld Screws are designed to be permanently welded to like materials. Weld Screws are available in low carbon, stainless steel, heat-treated, and plated. A variety of threads are available, and most of our weld screws are designed to be welded within confined spaces.
- Thumb screws offer a hand-adjustment feature, which allows for a simple action to fasten, tighten, loosen, or remove the screws. The main benefit is that no tools are needed, so assembly teams and end-user consumers can adjust the screws with the thumb and forefinger alone
- Set screws are a type of blind screw, designed to hold collars, pulleys, or gears on shafts. If you used a hex bolt, you’d most likely find that the assembly failed to work efficiently and smoothly due to resistance from the bolt’s head.
- Shoulder screws, also called Shoulder Bolts or Stripper Bolts, are a type of screw with three distinct sections: the head, the unthreaded shoulder, and the threads
- self-tapping screws are screws that have the ability to tap threads into the material. Self-tapping screws are used for all sorts of materials including wood, metal, and brick. These screws cannot drill through metal and require a pilot hole to be pre-drilled before installation.
- Self-drilling screws can be used for a wide variety of applications which involve fastening two different types of materials together. They are commonly used to fasten metal to wood, or even metal to metal
- Socket screws contain a hexagonal socket, or internal drive, in the head. The way to tell if a screw is a socket screw is by the tool required to tighten and loosen it. The general rule of thumb is simple: if you need an Allen or hex key, or a special internal wrenching drive, then it can be classed as a socket screw.
Bolts and Nuts
Bolts and nuts are other types of fasteners, A bolt is a type of fastener, usually made from metal, that commonly comprises a head at one end, a chamfer at the other, and a shaft characterized by an external helical ridge known as a ‘thread’. Bolts are typically used to hold materials or objects together or to position objects. normally they need to work with nuts
- Flange bolts have a circular flange under the head that acts like a washer to distribute the load. Flange bolts that are non-serrated are sometimes called frame bolts.
- Carriage bolts are used to hold together wood with wood, wood with metal, and even metal with metal. Their particular shape allows the bolt to be self-locking when placed through a square hole, especially when dealing with metal.
- Hex bolts, or hex cap screws, are large bolts with a six-sided head (hexagonal!) used to fasten wood to wood, or metal to wood. Hex bolts can be used in tight spaces to secure wood, metal, plastic, and other materials. Hex bolts are commonly used in buildings and bridges.
- Elevator bolts are designed to hold together canvas belts used in grain elevators and other conveyor systems. The large diameter of the head and square neck creates a greater bearing surface to keep the bolt from going through the soft conveyor material.
- Expansion bolts are fasteners used in masonry materials that expand once inserted into a predrilled hole in the masonry. The expansion of the anchor is accomplished in different ways and the anchors are designed for different applications. Expansion bolts come in a number of different configurations and types
- Coupling nuts, also known as extension nuts, are elongated internally threaded nuts used to join two male threads. Coupling nuts are often used for joining threaded rods or hanger bolts in a variety of applications that require extending threaded rods or attaching like items.
- Flange nutS looks like a standard hex nut from one side, but the bottom is widened into a circular flange, creating a bell-like shape. Manufacturers serrate the bearing surface of that flange to create serrated flange nuts, allowing for a better grip on the surface of the joint.
- Hex nuts are six‑sided nuts and are the most commonly shaped nut today. They are used with anchor shackles, bolts, screws, and other externally threaded components. Hex nuts, in conjunction with these other fasteners, are used to connect both metal and wood components to prevent tension and movement
- Lock nuts are internally threaded fastener that possesses locking capabilities either by themselves or in concert with another component. By design, lock nuts are engineered to resist loosening when subjected to vibration or torque
- Slotted Nuts have slots cut into one end of the nut. When it is used in an application, a bolt or threaded bar generally has a pre-drilled hole so that when the slotted nut is threaded on and torqued to the required position, it can be then secured using a cotter pin or write to prevent rotation.
- square nuts are four-sided nuts. Compared to standard hex nuts, square nuts have a greater surface in contact with the part being fastened, and therefore provide greater resistance to loosening (though also greater resistance to tightening).
- a lug nut or wheel nut is a fastener, specifically a nut, used to secure a wheel on a vehicle. Typically, lug nuts are found on automobiles, trucks (lorries), and other large vehicles using rubber tires.
Washers, Rivets, Studs, Pins
- Tubular rivets are used to fasten duct work or assemble mechanical products and electronics. Tubular rivets have a hollow shaft to reduce the amount of force required to apply them.
- Pop rivets, also known as blind rivets, are a type of rivets. They are used in applications where it is limited – or no – access to the rear side (blind side) of the parts to be joined.
- Solid rivets consist simply of a shaft and head that are deformed with a hammer or rivet gun. A rivet compression or crimping tool can also deform this type of rivet. This tool is mainly used on rivets close to the edge of the fastened material since the tool is limited by the depth of its frame.
- Square washers fit into slots and channels and have flat sides to keep them from rotating. They are wider and thicker than most round washers, making them good for distributing heavy loads. 316 stainless steel washers have excellent resistance to chemicals and saltwater.
- Beveled washers are square and while one bearing surface is flat, the other has an oblique (sloping) angle. Used in structural applications, they are designed for leveling and shimming purposes and are commonly used when bolting through the flanges of I-beams.
- Flat washers protect surfaces by evenly distributing torque when a bolt or screw is tightened. They prevent corrosion between a steel screw and an aluminum surface. A nylon washer can be placed under a machine screw to reduce noise and abrasion and offer electrical insulation
- Lock washers are designed to be tightened to a required torque beneath an ordinary fastener. They exert a spring tension that keeps the fastener from vibrating loose. They are often attached to the nut side of the fastener
- spring washers are a single, circular, fastening component possessing deflection properties that provide spring tension in bolted assemblies. They are able to withstand a wide range of pressures and are often a cost savings solution when space requirements and assembly weight are design factors
- Spring pins may be used to retain a shaft as a journal in a plain bearing, as a type of key to fasten one shaft to another, or to precisely fasten flat faces of mating parts together through symmetric hole locations.
- Internally threaded anchors
- Externally threaded anchors
- Masonry screw and pin anchors
- Screw anchors
- Hollow wall anchors
- Sleeve anchors
- Drive anchors
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