What is a screw ?

A screw is a combination of simple machines—it is in essence an inclined plane wrapped around a central shaft, but the inclined plane (thread) also comes to a sharp edge around the outside, which acts a wedge as it pushes into the fastened material, and the shaft and helix also form a wedge in the form of the point. Some screw threads are designed to mate with a complementary thread, known as a female thread (internal thread), often in the form of a nut, or object that has the internal thread formed into it. Other screw threads are designed to cut a helical groove in a softer material as the screw is inserted. The most common uses of screws are to hold objects together and to position objects.

A screw will usually have a head on one end that contains a specially formed shape that allows it to be turned, or driven, with a tool. Common tools for driving screws include screwdrivers and wrenches. The head is usually larger than the body of the screw, which keeps the screw from being driven deeper than the length of the screw and to provide a
bearing surface. There are exceptions; for instance, carriage bolts have a domed head that is not designed to be driven; set screws often have a head smaller than the outer diameter of the screw; J-bolts have a J-shaped head which is not designed to be driven, but rather is usually sunk into concrete allowing it to be used as an anchor bolt. The cylindrical portion of the screw from the underside of the head to the tip is known as the shank; it may be fully threaded or partially threaded. The distance between each thread is called the “pitch”.

The majority of screws are tightened by clockwise rotation, which is termed a right-hand thread; a common mnemonic device for remembering this when working with screws or bolts is “righty-tighty, lefty-loosey”. If the fingers of the right hand are curled around a right-hand thread, it will move in the direction of the thumb when turned in the same direction as the fingers are curled. Screws with left-hand threads are used in exceptional cases, where loads would tend to loosen a right handed fastener, or when non-interchangeability with right-hand fasteners is required. For example, when the screw will be subject to counterclockwise torque (which would work to undo a right-hand thread), a left-hand-threaded screw would be an appropriate choice. The left side pedal of a bicycle has a left-hand thread.
You may have visited a shop and you need a few screws, but there is a thousand types of screws in the shop having different shape, size, material which surely confused you. There are different screws which mainly depend upon the application, head shape, drive style or recess type, threads shape. Screw type is totally depending upon the material in which it going to be fastened. Using the right screw will avoid the concern like cracking of the screw head, loose screw conditions, tear up of material and improve the reliability. So I am going to discuss some common screw types and what you generally need for your projects or other household’s products.

Here types of screws classified in 4 different categories:
A. On the basis of application
B. On the basis of drive style
C. On the basis of threads
D. On the basis of head shape or Style

1. Wood screws

As the name suggest, these screws are used to fasten wood materials together. The basic wood screw is made up from brass, bronze, and steel. The point need to be notice at its shank part, which get bigger, thicker and wider as we get closer to the head, often have unthreaded shank at the top. So while using this basic wood screw, you need to pre drill a pilot hole into the materials so that the unthreaded shank part easily able to go into the material. But as time went by there are some woodscrews which have a full thread shank with having same diameter from end of the head to the tip of the screw so they may not need to drill pilot hole. Now come to its head part, which totally depend upon the application you are applying for .Like if someone needs for decoration purpose, round or oval woodscrew can be used, if someone wants to flush out the screw with the surface, flat head screws can be used. Wood screws also comes in coarse and fine threads, coarse (contain fewer threads) one is used for soft wood material while fine (contain more threads) one used for hard wood materials.

2. Drywall Screws

These screws come with a bugle head which prevent tearing of the surface. Generally a drywall screw comes in two categories and is divided according to the length and pitch. The one is (W-Type) which is coarse threaded, for fastening drywall with soft woods, with having high pitch and length.
The other one is (S-type) which is fine threaded for fastening drywall with hardwood or metal studs, and having short length and pitch. Fine threads have self-drilling tip which eliminate the requirement of pre drill hole or pilot hole. This helps the screw to move fast into the material without tearing up the material.

3. Deck Screw

These types of screws are similar to drywall screws except having better corrosion resistance coating like zinc plating galvanized, ceramic coated, etc. These screws are made for wood decks, so that it can withstand harsh environment conditions. To ensure screws rest smoothly against the deck surface they have countersunk head. They often available in sharp edges, narrow point, to avoid pre drilling of pilot holes.


4. Sheet Metal Screws

These are used to join metal pieces together or metal piece to wooden, plastic, or any other kind of surface. They come in variety of shapes and sizes with many different head styles like flat, oval, truss, pan, hex etc. according to application and shank with a fully sharp threaded tip which enables to enter in any hard material or metal. There are generally two kinds of sheet metal screw , the one with a pointed tip, require pre drilling before entering into the material, the other one known as self-tapping or self-drilling screws which already have a drill bit shape on the tip of the screw.

5. Eye Screw

These are the screws having loop shape on the top and shank with threads on the other end, having a stiff eye design which ensures stability and strength. These shank tips easily go into wood without stripping and provide strength and durability. These screw types are ideal for used with ropes, chains and cables and are used for lifting cable wires. These are quick, easy to install and inexpensive.

6. Concrete Screw

Concrete screw also known as masonry screw used to fasten metal, wood or any other material to the concrete or masonry. They are generally are made up of stainless steel or carbon steel screw being blue in color, with or without corrosion coating. These types of screws commonly have either Phillips head or slotted hex washer head.

7. Double Ended Screw or Dowel Screw

Double ended screws are used where you can spin the two pieces together. These are the headless screws and are threaded with wood screw on both ends or wood screw on one end and machine screw on other. These are used to conceal the joints. The use of dowel screw makes easiness for the operator because it is easily attachable and detachable with the hands. These are used in various applications like in snooker stick whose size can be easily shortened (detachable) by spinning two pieces together.

8. Set Screws

These fasteners are headless, also called blinds, only having threaded part of the screw. These types of screws are used to resist relative motion between the two rotating objects such as movement of a pulley on a shaft, thus it is used to secure one object within another. Set screws come in variety of tips type such as flat point, cup point, cone point, half dog point. The Different tips have different properties that one can utilize according to the application.

9. Lag Screw

These screws are the toughest one and are generally used to fasten heavy lumber pieces or materials which bear a heavy load. These are somewhat different from other screws like wood screw and are massive in size. They are mostly found in hex or square headed with coarse threaded. They are sometime referred as ‘lag bolts’ which is not correct.

Screws for building and construction industry

Hex washer head self-drilling screws

Hex washer head self-drilling screws are needed for metal-to-metal fastening in all types of jobs, whether you’re working in commercial construction or just taking on a do-it-yourself project around the house. Because of the inherent challenges in metal-to-metal fastening, hex washer head screws are designed with unique features that make them perfectly adept at fastening metal components to other metal components with strength and ease.

What Are Self-Drilling Screws?

What makes self-drilling screws such a popular choice for building and construction projects? Hex washer head self-drilling screws are often sought after because of their versatility, efficiency and ease-of-use.
Self-drilling screws, often referred to as Tek screws, have a point that resembles the look and functionality of a drill bit. The tip of the self-drilling screw allows it to easily carve into pliable materials like thin metals and wood surfaces smoothly without having to drill a separate pilot hole. By avoiding having to take the time for additional preparation you can save time, resources and project costs.
Self-drilling screws are numbered between one and five. Higher numbers indicate that the screws are able to penetrate thicker materials before needing to drill a pilot hole.

Uses for Self-Drilling Screws

The self-drilling hex washer head screws are suitable for any type of building or construction job. Self-drilling screws are best used for securing pieces of metal or attaching thin sheet metals to wood surfaces. All our hex washer self-drilling screws are fully threaded for better security and weight distribution for lasting sturdiness and heavy-duty use.
Our screws are ideally used for the following projects:
 Building warehouses, carports and backyard sheds
 Fastening garage door parts and panels
 Metal roofing installations
 Securing gutter systems
 Electrical projects

Features of Hex Washer Head Self-Drilling Screws

The hex washer head self-drilling screws are expertly manufactured from the highest quality materials with improved features to guarantee lasting performance and reliability. With our large selection of self-drilling hex washer head screws, you’ll find the widest variety of finishes and features to suit any type of project you have and dependably withstand nearly any type of environment.
All our hex washer head screws have the following characteristics:
Durable Finishes: Our hex washer screws feature either zinc plating finishes or are crafted from pure 410 stainless steel. Our zinc coatings have superior corrosion resistance, while our 410 stainless steel has been specially heat-treated for
exceptional resilience and lasting strength. Like our zinc platings, 410 stainless steel also has corrosion and rust resistant properties.
Fully Threaded Design: With full threading from the tip to the head of the screw, the screw has better weight distribution than alternative fastener options. Full threading allows our screws to handle various amounts of tension and withstand greater force for longer periods.
Self-Drilling Point: With self-drilling points, these screws can tap their own holes and create their own partner threads while being inserted into materials for a more secure fit. With self-drilling screws, you can minimize mess and save time and money.
Washer Hex Head: Screws with a hex washer head are intended to be driven by a wrench or socket. With this installation method, you can minimize unnecessary slippage and keep the socket on the screw without having to constantly reset the grip on the tool. Many of our hex washer head self drilling screws have the washer built solidly into the screw itself, which allows the surface pressure to be more evently distributed across the surface of the screw for a more secure fit and stronger fastening.

Hex Washer Self-Drilling Screws for Commercial Projects

Does your construction company need a source for hex washer self-drilling screws? we offer a huge selection of the best in hex washer head screws. We offer them at affordable prices and we also provide fast shipping that gets them to you quickly.
Make sure you have a source of quality materials you can trust when you choose to work with. We want to help you satisfy and delight your own customers with the results you can achieve.

Hex Washer Self-Drilling Screws for Residential Projects

We offer hex washer self-drilling screws to homeowners who are dabbling in do-it-yourself projects. These homeowners are looking to achieve professional-grade results, and we help them by delivering access to professional-grade materials. Do your best work and achieve the best possible results when you choose to work with Caprina.

Get Your Hex Washer Head Screws Fast

We offer competitive pricing and fast shipping that gets you the products you need just as quickly as possible. Shipping is even free on all qualifying orders, and we offer 100 percent hassle-free returns without an expiration date. That means we’ll take back any
hex head self-drilling screws you haven’t used, if they’re in like-new condition, at any time.
You can also order in the quantity you want. Some suppliers may offer preset bulk amounts for ordering hex washer self-drilling screws.

A Focus on Quality

At Caprina, quality always comes first. We choose to carry only high-quality products, like the ones you’ll find in our selection of hex head self-drilling screws. And we choose to deliver only the highest-quality customer service. That’s why we offer our affordable prices, fast shipping and no-hassle returns. We know your commercial and residential construction projects are important and we want you to have the hex head self-drilling screws (and other hardware) you need, right when you need it.