Screws are a common fastener type found in a wide variety of products. Screws exist in a variety of shapes and sizes, and each one serves a specific purpose based on the type. Words like screw and bolt are often used interchangeably in everyday conversation. Screws are the more common name for smaller fasteners, whereas bolts are the more common name for larger fastening. After being placed into the material, a screw retains itself in place through self-adhesion. A bolted joint is created by passing a bolt through two materials and then tightening the bolt with a nut. Think about how a machine screw is installed, and you will see that it requires a nut or pre-tapped hole.
What is Screw?
This metal tip has helical threads that run around its long shaft and slotted head, which are used to link objects together by twisting them together. Screws are fasteners that can be used with instruments like hammers or screwdrivers to secure materials.
Screws that are self-threading are typically made so that when the screw is turned, the thread cuts into the material. To prevent the fastening material from being yanked out, this creates an internal thread that can be pulled together and held in place.
Shapes and sizes are available, and each one serves a particular purpose. For your project, it will be tough to distinguish between different sorts of screws, such as those that are round, flat, short, or long.
We’ve compiled a list of different types of screws that are commonly used in industry and at home to provide you with more information. So, let’s have a look at the different kinds of screws.
Parts of Screws
As you can see, the screw has a number of important components such as
Screw heads are another name for these pieces. A screwdriver’s tip will fit into the drive to turn the screw. Drives come in a wide range of sizes and forms. If that’s the case, a personal toolbox should have a variety of screwdriver tips.
The threads and helical grooves of the screw are located in this portion of the screw, which is tapered. The screw secures the two halves together at this point.
Helix or conical spiral ridge or similar portion on the outer or inner surface of the cylindrical or conical cone.
When it comes to making a difference, pitch refers to the space between each thread. Screws with short, closely spaced threads are known as hex screws. Some have threads that are bigger and more widely spaced.
Size of a Thread
In general, the length of the thread is either full or partial. As a result, there are both full and partial screw threads.
The screw’s head is the most important component, as it sits directly on top of the cap. Screw heads can tighten or loosen virtually any type of screw. Most of the time, it’s wider than the shank and thread combined. A screwdriver or wrench can be adjusted here.
The longer, non-threaded section of the screw is called the hex head. Some screws may not include this component. It is normally located at the top of the wood screw, allowing the tip of the screw to penetrate the wood as if it were a normal screw.
At this point, the screw enters the item it is being inserted into, and is at its shortest length. Screwing through the joints is typically a good idea.
Bolts that don’t have tips must be installed into pre-existing holes. However, some screws do not have this portion of the screw where the threads remain.
The crest of the thread, whether internal or external, is the most important section of the thread. This is the crest of the thread.
The minor and major diameters of the screw are used to determine the screw’s thickness. At the thickest point of the thread, the major diameter is the diameter, while the minor diameter is the diameter at the screw’s base.
Types of Screws
Following are the types of Screws:
The shank of this bolt is rounded the entire length, making it unique from other bolts. Domed heads on the carriage bolt prevent it from loosening on one side. Additionally, the larger screw head prevents the bolt from being dragged through the wooden structure. The exposed side of the carriage bolt cannot be unlocked by using a domed head nut.
To secure metal or wood to metal, carriage bolts can be used.
Socket-head machine screw for attaching components; this type of screw may be twisted with a screwdriver.
To secure a tapped hole to the surface, these screws are utilized. Tensile loads hold the components together while the screws are tightened. In most cases, their pointed ends are utilized to link metal components together. Nylon, brass, stainless steel, and carbon steel are just a few of the materials in which they can be found today.
Electronics, engineering, and manufacturing equipment, among other fields, use them to keep machine parts.
Screws having thick threads and a strong design, such as hex or square head screws, can support heavy workpieces. The large length of the lag bolt ensures a long-lasting connection. As a result, they’re commonly seen on heavy-duty materials and machinery. The screws are usually heavier than the typical wood screws. Ordinary wood or sheet metal screws are not like these.
Lag screws are commonly used in construction to secure wood components together in heavy-duty applications.
With or without rust coating, they are available in stainless and carbon steel. Before inserting a masonry screw, a small hole must be pre-drilled with a carbide bit or hammer drill. For countersinking, you’ll want a flat-head masonry screw; otherwise, you’ll want a hex washer head, which rests on top of the material.
Masonry screws are heavy-duty screws that can be used to secure the concrete, CMU, mortar joints, and brick.
Double Ended Screws
Double-ended screws are threaded fasteners that are used to establish a joint that is often located beneath the object. These are typically used for two pieces of wood or two items that can be moved in tandem. Two pointed ends can be put into two surfaces to create a hidden junction.
A mix of wood and machine screws can be used to make headless screws with revolving threads at both ends. Double-ended screws are easy to use since they may be attached or removed from the user.
To conceal joint, double-ended screws are a type of threaded fastener.
In order to link wood and composite boards together, you need stainless steel or carbon steel screws. They are constructed in a way that makes them resistant to corrosion and rust, allowing them to tolerate moist circumstances. Covered threads with sharp corners and thin tips are available.
In the context of outdoor use, deck screws are specialized screws intended to hold flat roofless buildings (such as decks) together.
Self-tapping screws with a cylindrical shaft are a unique type of these screws. To keep them from coming loose from the drywall, these screws feature longer, deeper threads than standard screws.
Drilling through drywall is made easier by their rough thread and flat tip, which necessitates the use of a power screwdriver. Deck screws, on the other hand, are more corrosion-resistant than drywall screws. They don’t need to be pre-drilled because they have their own drill bit.
Attaching drywall panels to softwoods or metal studs is a common application for drywall screws.
As springs, these screws reduce the space between the head of the screw and the nut. Various types and sizes of washer-faced screws are available.
To put it another way, certain screw heads contain teeth that bite down into the workpiece’s surface and secure it there. The washer face is situated immediately below the head of this type, making it easier to tighten the screws.
For simpler tightening, this screw has a smooth bearing surface.
Eye Bolt Screws
One end of an eye bolt features a loop in the shape of an eye, and the other end is threaded around the screw shank. The metal construction makes them lightweight and portable, while still providing the stability and strength needed to readily pull or raise an object with a rope.
When tying ropes or cables, eye bolt screws can be used to attach a secure eye on a structure. Anchoring, pulling, pushing, and hoisting are all common uses for eye bolt screws.
Brass, steel, and bronze are the most frequent metals used to make wood screws. A variety of heads and threads can be found on wood screws that are used in woodworking.
While the diameter of the screw is thicker at the tip, it thins out as we get closer to the top. The shanks of these are available in both the partially and fully covered varieties. This screw’s head size varies depending on the application.
Attaching a wooden workpiece is a common application for this type of screw.
Welding these to a metal surface with a shaft and nut and washer is required to keep the item in place. For the first step in the welding process, an electrical impulse is used to melt a certain spot on the screw and then another electrical impulse is used to melt another point on the plate.
For no-hole welding, the welded screw’s head protrudes. It is then joined to the metal foundation by welding it to a separate piece of metal.
The automotive, industrial, maritime, construction, and aerospace industries all make use of these components.
Sheet metal, wood, composite decking, and cement fiberboard all need framing screws. Special screeds are available for a wide range of surfaces, from hardwood floors to more fragile ones. As with circular saw blades, frame screws serve a similar purpose: they prevent sawdust from reaching the screw hole’s edge.
Uses of framing screws include kitchen cabinet installation and deck construction.
Hex Cap Screws
Hexagonal bolts with a perforated hex head and a washer face on the bearing surface are known as hex cap screws. It is common for these screws to be used for attaching metal to wood. The body measurements of these screws are extremely precise and contain a chamfer. They are suitable for interior home repair tasks since they contain short steel threads.
For proper installation, these screws come with a flat washer under the screw head. Among the many applications for hex bolts, docks, bridges, roads, and buildings are among the most common.
Here’s a quick guide to the many sorts of screw heads so you don’t go crazy trying to find out everything there is to know.
Flat Screw Heads
In order to prevent the screw head from being visible, flat screw heads are countersunk, which means they sit fully flush with the surface or slightly below it. The finish is considerably neater and better appearing, which is essential in furniture that is regularly used or passed by, such as sofas.
The angle between the top of the head of a flathead screw and the point where the threads contact the head can vary greatly. The most frequent and conventional angle is 82 degrees, however alternative angles, such as 90 degrees and 100 degrees, are also available. The countersink hole has to be more spread out and shorter as the degree increases.
If the screw’s head has a straight, linear notch, a flat-head screwdriver’s tip will tighten or loosen the screw.
Raised Screw Heads
Raised screw heads, which are also known as oval-shaped heads, have an angle comparable to that of flat screws, although their heads are more dome-shaped rather than fully flat. This means that the head of these screws will protrude slightly from the surface.. Countersinking these screws is an option, too, depending on the angle and finish you choose.
These screws’ domed heads make them more beautiful than utilitarian, but their performance is rather good anyway.
Some projects call for the elevated screw head, which is also known as an oval head.
Bugle Screw Heads
Drywall, drywall substitutes, and plasterboard all benefit from bugle screw head shapes. Flat screw heads are also a common type of screw head for these screws. Curved rather than angular below the head is intended to reduce damage to the surface. The nicest thing about self-drilling bugle screw head kinds is that no pilot hole drilling is required before utilising these.
In addition to their traditional use as a fastener for drywall to wood or metal studs, bugle head screws can be utilised for a wide range of other activities in the construction industry.
Binding Screw Heads
It is important to note that binding screw heads are non-countersunk, which means that these heads do not have an angle and are readily visible on the project’s surface, sitting above it. As a result, the screw head won’t require a countersink divot. Binding screws feature a slightly domed head that can be used in a variety of applications. The male and female sides of these screws allow them to be screwed together.
Many different types of screw heads have a variety of uses in the bookbinding industry as well as other industries.
Domed Screw Heads
Like ants, domed screw heads may be found just about anywhere. Any project that doesn’t require a flat head can be completed with these dome screw heads, which are the most widely available. As a decorative option, you may use these screws to create patterns of metal studding on furniture, such as ottomans or sofas. In order to keep the screw in place, the dome’s inner flat surface serves as a guide for the screw.
To give a project a more finished look, dome heads are a common screw head style.
Flange Screw Heads
Flange screw heads, which are also known as frame screw heads, have a flange that protrudes from the bottom of the head. There are two basic shapes for this piece of metal, and both aid to secure the screw in place. In some applications, it even performs the same functions as a washer. Prior to drilling, make sure that you are using the correct sort of drill bit to avoid damaging your wood.
Self-drilling screws are commonly utilised in a wide variety of construction tasks.
Tri-Wing Screw Head Shapes
The Tri-Wing company’s screw head forms and the bit shapes required to use them are both trademarked. It’s best to term them Y-Type forms, but Tri-Wing ones are different.
These are one of numerous varieties of tamper-proof security screw head shapes that are so uncommon that the bit needed to mess with your goods will be difficult to come by.. In these, the Y form is actually a little more rotating, if that’s even possible.
Phillips Screw Heads
Phillips screws have a cross-shaped head that aids in self-centering the screw and prevents drilling at an awkward angle. A drill can also be used to install these because they don’t budge under the force of a drill’s drill bit. Of course, the screw’s strength will be determined by the material used in its manufacture.
Because Phillips screw heads allow for a tighter fit than a flat head screw, most factories and handymen prefer to use Phillips screws.
Truss Screw Heads
The heads of truss screws have a somewhat rounded surface and are usually wider than those of other screws. In order to accomplish the goal, this is exactly what it was meant to do. With sheet metal or tasks that require large holes, these screw heads are typically employed.
A common finishing screw in the woodworking and carpentry industries.
Combination Screw Heads
In the case of combination screw heads, the best of both worlds can be found. So, these screw heads are some of the most common out there, and you can even find a variety of permutations and combinations. There are usually two or more drivers that can handle combination screw head shapes. The shape of the head will tell you whether or not these screws should be countersunk, and that’s about all you need to know about them.
A countersunk screw head has an angle under the head, whereas a non-countersunk screw head has a flat bottom.
In order to tighten or loosen a combination drive screw head, phillips and flat bladed screwdrivers can be used. They’ve been intended for situations where the user only has one type of screwdriver available.
Star Screw Heads
Star screw heads have star-shaped heads, as the name suggests. The star-shaped screw heads can be found on screws of all sizes and shapes. Using square recesses as an example, the centre 8-point star is formed by two double squares. As a result, you can use a Robertsons bit to drive them.
Robertsons can also make a 12-point star because they go up to three squares. When a lot of force is being exerted on a screw, they are typically employed to keep the screw from stripping. In automobile interiors, these screws are prevalent.
Computer systems, hard drives, and consumer gadgets all make extensive use of this technology.
Hex Screw Heads
External and internal hex screw heads are available. An external screw head resembles a bolt head due to its hexagonal shape and protrusion from the surface. Flanges can be found in the heads of some hex external screw heads, but not all of them.
These screws require a socket or a wrench for installation or removal; the complete head is rotated, rather than only the interior part of the head, allowing for greater leverage. You don’t have to be concerned about stripping the head to get a lot of torque.
The usage of hex internal screw heads in the construction and installation of furniture is prevalent. This is because, unlike slotted or Phillips screw heads, they can survive the Allen wrench during installation and removal. It’s a win-win situation in the long run!
Allen wrenches are required for installation and removal of internal hex screw heads, hence most come with one.
It is used to hold an object in place, either inside or on top of another object.
Square Recess Screw Heads
Screw heads with a square central point, often known as Robertsons, help prevent cam outs. With these heads, the bit that is used to drive screws also has a square taper. As a result, the bit does not need to be held in place by anyone.
Hardwoods and other “tough” materials are commonly used in furniture manufacture, as well as in other demanding industries this screw head is applicable.
Slotted Screw Heads
A wide flat head screwdriver bit can be inserted into them by drawing a straight line through the centre of the bit. While the increased surface area and torque make them less likely to strip, the bit is still at risk of coming loose from the bottom of the slot.
A smaller Phillips or flat-head screwdriver bit can be used on some of these, depending on the design. Combine heads are the term for these mixtures.
Simple carpentry and applications requiring little torque can benefit from the use of this tool as part of the restoration of antiques, slot screws are frequently employed.
Choosing the correct fastener, from wood screws and deck screws to specialty screws for machining, woodwork, or metalwork, helps ensure a successful job. As you’ve learned, screws come in a variety of shapes and sizes, so it’s important to choose the proper one for your project.
Despite the fact that this is by no means an exhaustive list, we sincerely hope that our introduction was sufficient to help you hit the nail on the head. You should now be aware of the various advantages and disadvantages of different screw heads.
As a result, I believe I’ve covered everything there is to know about screw types and screw heads. If you’re still unsure about anything, feel free to reach out to us or post a question in the comments section below. If you like reading this, please tell your friends about it.