Bolts, it can be also said as screws, we all know about it right ? – they are the most handy fasteners that everyone uses for pretty much every project in combining with the hammers and screwdrivers. They come in different shapes, sizes and features. It totally depends on your usage as you find the screws thin, short, fat, round, long etc.
But did you know that there are thirty-four (and even more) types of screws? In this article, we’ll be going over these so that you can know which one is best for your project.
Countersunk heads are a type of screw head that rests fully into the material once it is inserted – i.e. that the head sinks into the surface.
1. Decking screws
Decking screws are amongst the most commonly used types of screws, designed for attaching boards or planks to metal or wood frames. Decking screws comes with different widths and lengths. Amongst the biggest benefits are that the user does not need to drill any holes in advance.
- It can be used for fastening wood, deck boards, frames and more.
- Mostly used in exterior building work
- It also can be used for wooden chairs
- You don’t need any pre-drilling holes
2. Pan-head screws
Pan-head screws are mostly used in metalwork. Their most important feature is the rounded sides of the screw head, which makes them excellent for metal. They are very familiar to the rounded oval head screws. Note that, unlike oval head screws, the top of the head is still flat – only the sides are rounded.
3. Hex cap screws
Hex caps have six-sided heads, occasionally with a hexagonal groove for screwdrivers of the same shape. They are used to attach any material to wood. Due to their relatively small steel threading, they are useful for interior modifications or other more delicate work.
4. Carriage bolts
These bolts are especially useful for fastening metal and wood and are well known for their durability. Due to their domed head, they don’t loosen over time, as well as the large carriage bolts which ensure they get pulled through in the case of woodwork.
5. Lag bolts
Lag screws use a hexagonal head, and, due to their hardcore, bulky nature, are used in large-scale projects. The materials used for these are also very durable, usually high-carbon steel and galvanized zinc, which makes sure they don’t corrode over time.
6. Hammer drive screws
Hammer drive screws are mostly used as nails and are great for minor, quick jobs such as attaching a nameplate. Due to their rounded, sinking head and elongated threading, they can quickly be driven into a pre-made hole with a hammer or mallet, with relatively durable results.
7. Square head bolts
These are pretty much the same as the hexagonal-shaped cap screws, but they use a 4-sided head instead, which allows for easier wrench grip.
8. Socket-head cap screws
Socket-headed screws are used where space is scarce. Rather than driven by a wrench, these bolts have a hexagonal socket, which allows for tighter gaps when installing, because there is no need to leave space for wrench work.
- Less screws are needed for work, thus you need very few holes to drill
- As the usage is low for this type of screw, the weight will be decreased on the component parts
- hexagonal screws require extra space then socket-head screws
9. Oval head screws
The bottom of the head is slightly rounded with these screws, which allows for a much better grip, as they sink into the material quite nicely. They are commonly used to give an aesthetic finish, as they look quite attractive, and are also very durable.
Non-countersunk heads don’t sink into the material they are applied to.
10. Wood screws
Wood screws are most commonly flat and round-headed and are used to connect wood to wood.
11. Sheet metal screws
Most often seen in the welding industry, these screws connect metal to metal. They come in many different shapes, but what’s unique is that they are made of pure steel, with a waterproof coating of aluminum or stainless steel.
12. Thread-rolling screws
Unlike most classical screws, this type of screw doesn’t cut threads into the material, rather it presses against the walls of the material to create the threading grooves. This is why it is best used for softer materials, mainly plastic, but on occasion wood.
13. Socket-head screws
These screws are best for joints when you need a fastener below the surface of the material. They are strong, resistant to rust, and they look great when installed.
14. Set screws
These screws are excellent when connecting two solid objects, as they are fully threaded, and don’t have a head.
15. Weld screws
These screws are welded to a base surface, typically metal, to create a permanent protrusion, which can, later on, be used for attaching components. These screws are mostly used in components that are sold in separate parts, later to be assembled by the consumer.
16. Raised or slotted cheese screws
Cheese screws are entirely made from stainless steel and feature a round, raised head. They are used in lots of industrial applications, due to their resistance to rust.
17. Fillister head screws
Fillister head screws are specifically known for their extra-large heads, used for attaching wood or metal to metal.
18. Drywall screws
Drywall screws are used for fastening drywall to ceiling joints or walls. There are coarse drywall screws, which are used for wood, and fine drywall screws, which are used for metal.
19. Concrete or masonry screws
Concrete screws are used for attaching large, heavy components to concrete. Because of the way the threading is designed, they are very strong and durable, perfect for concrete work.
20. Machine screws
Machine screws are used in machinery and technology – computers and other types of technology. They are blunt-ended and are specifically meant to attach two metal parts with the help of a nut. They come in pretty much every material.
21. Modified truss screws
Modified truss screws are useful because of their large heads, which provide a much better hold on materials, especially for metal on metal or metal on wood.
22. Washer-faced screws
These screws have a hexagonal head. Their threading is designed to act as a spring, to reduce the distance between the head and the bolt.
23. Thread-cutting machine screws
The tip of this screw is extra sharp and has a strong grip, which makes it perfect for stiff materials, as they ‘bite’ into the material and hold tight.
24. Self-drilling screws
Self-drilling screws are used when one doesn’t want to pre-drill a hole, which is because they make the hole themselves as they are screwed in, hence the name. They come in many sizes and types, with different drill ends for different purposes.
25. Self-tapping screws
Self-tapping screws are designed so that they make their thread as they are inserted. They are usually installed by drilling a hole slightly smaller than the screw, and then inserting it, allowing it to cut out its own threads on the way in. This allows for a much tighter grip on the wood. More heavy-duty self-tapping screws can work not only for wood, but even metal, concrete, or brick.
26. Framing screws
Under the head of these screws are strategically placed teeth, which allow for the screw head to strongly sink into the material, allowing for a very strong, durable attachment.
27. Tamper-resistant screws
Tamper-resistant screws are designed to be difficult or impossible to remove and are used in places where vandalism may be common, or on car license plates or prisons.
28. Sex bolts
Sex bolts consist of two parts, a barrel-shaped cylindrical screw, and a normal threaded screw that can fit into it. They are useful when both sides of the material are accessible and need to be strongly secured together.
29. Eye bolts
Eye bolts consist of a ring circular head, parallel to the threading, and are used for numerous purposes, such as for lifting items in industrial settings, or for hanging decorations in homes.
Hence the name, J-bolts are shaped like a J, which means that once inserted into the material, there is a protruding hook that presses against it. They are particularly useful for their heavy-duty strength, usually used for stone or concrete in industrial settings.
U-bolts consist of two parallel threaded arms, connected by a U-shaped arch. They are most commonly used in plumbing and other industrial projects.
32. Shoulder bolts
Shoulder bolts are machine screws with an extra-large head. Their design makes them especially perfect for woodwork.
33. Elevator bolts
Elevator bolts are used in numerous appliances, but they are most commonly used in elevator bolts, due to their design and durability, specifically because of their threading, which extends from the head to the tip.
34. Hanger bolts
Hanger bolts don’t have heads and are mainly used for joining wood, either externally or internally. Because of their large threading, they make for really tight, durable joints. For more details – Thehubhaus.com