Fasteners in Mechanical Engineering – Bolts, Nuts and Grub or Set Screws

Mechanical engineering involves a group of disciplines also known as branches where we can find thermo-systems, manufacturing and design. Talking about the latter, we can say is the branch where the engineer can combine a series of components to create a new element or machine which shall be manufactured in a future. In order to achieve such creation, the engineer must go through very detailed calculation to determine the best components for the purpose of the design. A very important part of this entire process are the fasteners, which allow us to join together different parts or components and also make sure they will not have any undesirable movement while in service.

There are different types of fasteners with specific properties and uses, which should be selected according to the application. Among them, we find bolts, nuts and grub or set screws as the most common ones.

Let’s get to know a little more about the fasteners that were mentioned above.



First of all, the use of the words “bolt” and “screw” is widely unclear and the difference commonly misunderstood. A good way to have a better idea on this matter is that a bolt is described as any threaded fastener that is used together with a nut in order to assembly two unthreaded components, and that a screw is described as the same threaded fastener, but in this case being used to assembly two components where one of them has an internal thread where the fastener is fitted. Now, you can be sure that every time you use a bolt you will be needing a nut to complete what is known as a bolted joint. In this type of joint, the nut provides a fastening axial force at the time the bolt provides the needed resistance against shear forces.



As mentioned before, the nut is the element providing the fastening force in a bolted joint. The main feature of its structure is the threaded hole where the bolt is fitted, and its profile can be squared or hexagonal, being the latter the most common one. The bolted joints are frequently used because many applications makes it difficult to have a threaded hole in one of the parts being assembled. However, there are applications that involve a lot of movement and vibrations which can get the nut loose; thus, creating a major problem. This kind of problems are solved by adding other locking mechanisms.

Grub or Set Screws


Also known as “blind” set screws, this type differs from the rest for not having a head, but only a hole with a specific shape which suggests the type of tool that should be used in order to drive it. The most common ones are hexagonal (Allen), squared (Robertson) and star shaped (Torx). This kind of screw are frequently used as “safety” holders, together with a detent in order to resist or transmit high torque, which is why they are used in applications where parts are attached to a shaft, such as couplings, bearings, pulleys, among others.


Hex Nut M5 DIN 934 Stainless steel


Stainless Steel Hex Nut M5

100 or more only 0.01€


Source: Hex Nut M5 DIN 934 Stainless steel

Nuts and bolts

One of the most generally used fixing in the world today is the simple, but extremely effective nut and bolt. They are used in all aspects of our daily lives, from holding our vehicles together, through to holding top strength applications such as crash barriers in place.

Nuts and bolts come in a big range of sizes in both modern and imperial metric standard. They can be bought in stainless steel and plain steel. There is a preference to use nuts and bolts of stainless steel as they are not so prone to rusting, where as if you use plain steel for fixing something outside that is naked to the elements then you are likely to find the fixing rusts so quick, that in 6 month time you will not capable to undo it. So care is required when choosing your fixing.

A bolt is basically a screw with a blunt. Both of these kinds of fastener have a “thread” which is fundamentally a raised ridge winding in a spiral around the shank of the screw or bolt. The big difference between them, anyway, is the fact that a bolt is always accompanied by a nut to work perfectly. The nut typically also has a thread which permits it to be twisted onto the bolt so that the 2 adjacent surfaces that need joining are squeezed between the bolt and the nut head and thus held together.
Internal_and_External_Thread Anyway, even though bolts and nuts stay together through a blend of interlocking threads and torque it is easy for grip of the pair to loosen over time even though the nut was actually properly tightened. Fortunately, it is likely to remedy this by using smooth metal discs known as washers. Washers provide a smooth surface for the bolt or nut head to grip and can support to distribute force evenly.

Internet totally changes the world of buying and of course selling. Nowadays, you can also buy nuts, bolts, fasteners, and hex nuts through internet. Our main area of business is presently Ireland and UK. We at Staqoo offer the widest range of building materials especially in fasteners. Our main product range includes screws, washers, bolts and nuts. We trust in providing high quality products to our customers in a convenient way.
You can also connect us through social media like Facebook, Twitter, Google + etc. to keep abreast with our new products, discount, prices and other offers. If you have any concerns or queries or you want to give us an advice you can call our efficient customer representatives or email us at We are based in Virginia, Co. Cavan, Ireland.

Nuts and bolts online store

When building beautiful tree houses, castles, and pubs in Ireland I can think of many things that are helpful. But making sure I have the right tools and parts is not only helpful but extremely important. I want my building to be useful and safe, so I use Staqoo. With a store in Virginia Ireland and a wonderful online store for when I’m too far into building to stop I can get the building fasteners and materials I need. Staqoo provides me and my family the highest quality range of nuts, bolts, washers, and screws. With all the items made both high tensile and stainless steel I know I can trust them without doubt.

Did I mention the customer service too? Not only are the rates more than reasonable but Staqoo gives free delivery to local customers! You can purchase it both wholesale (for those REALLY BIG projects) or retail for the smaller more fun ones. With shopping so convenient and easy, a website that’s user friendly, and discount deals I don’t know why you would go anywhere else. And let’s not forget the hassle free and easy return policy people, we all know what it’s like to get the wrong one or too many sometimes, now it’s easy to fix.

Now for my FAVOURITE parts, Staqoo offers reward points and an affiliate program! So each time I purchase I get rewarded, and each time I share about them I get rewarded again! What is not to love?! So go ahead, log on to the website, and start winning when you build! Find them on Facebook, Twitter, even Pinterest! While you are there, grab a gift voucher for someone (maybe me?) and get your Staqoo relationship started today!


Staqoo Virginia
Yew Park, Virginia
Co. Cavan, Ireland

Telephone: 0862404703

About Us – Staqoo Virginia

Based in Cavan Ireland, we at Staqoo provide the widest range of building materials especially in fasteners. Our main product range includes nuts and bolts, washers and screws. We believe in providing supreme quality of products to our customers in a convenient way. Since our inception we have made sure that our quality and products are immaculate. We deal in products made both in high tensile and stainless steel. At Staqoo, we believe that customers are our main asset, hence we provide best rates and quality to them. Providing free delivery to local customers reiterates our ideology of customer satisfaction.

To reach to a wider audience we buy and sell through wholesale and retail. Our main area of business is currently Ireland and United Kingdom. Known for our matchless quality and variety of products, Staqoo has become an emblem of trust, reliance and quality. We believe in making shopping convenient and easy. For this reason our website is very elaborate and provides details and pictures of every product to make it easy for the customers to choose their required item. The website is user friendly and easy to navigate. The low rates, the discount deals and the suitable delivery charges further strengthens our bond with our customers. We take pride in providing the most competitive rates in the market without compromising on the quality. Our hassle free and easy return policy speaks volume of our standard and quality. To add convenience to our customers shopping experience we offer quick shopping, easy payment, reward points, gift vouchers and other such offers. Our bond with our customer goes beyond just buying and selling.

You can also connect us through social media like Twitter, Facebook etc. to keep abreast with our latest products, prices, discount and other offers. If you have any queries and concerns or you want to give us a suggestion you can call our efficient customer representatives and they will surely solve your issue or answer your query.

About Us

Virginia, Co. Cavan