Aug. 25, 2025
It is essential to use the correct size of Machine screws as they join parts of machines, engines, appliances, furniture or any equipment and work as bridges between two components. These screws are fasteners that join two or more parts together. There are two types of screws available in the market- manual screws and machine screws.
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This article will give you a complete understanding of machine screws and will also guide you in choosing the relevant size and type for the best results.
There are two major varieties of screws- machine screws and manual screws. The major difference between them is that machine screws are tightened by an electrical drill machine, whereas manual screws are fitted manually. Due to this, machine screws are better at fastening components than manual screws.
According to sizes, materials, models, and configurations, there are various kinds of machine screws available in the market, like stainless steel (SS) machine screws, brass machine screws, Phillips head machine screws, tamper-resistant machine screws, plated machine screws, Torx heads, slotted or flat-head machine screws, hex-head machine screws, Fillister machine screws, and Pan-head machine screws.
Machine screws are used in making modular kitchens, furniture, construction equipment, etc. They are designed to be inserted into a pre-cut or pre-threaded hole. Machine screws consist of a head and a fully threaded shank. The exterior of this shank allows the machine screw to be inserted in the tapped hole and join the two ends.
Good machine screw manufacturers will always suggest SS machine screws instead of any other fastening as they have the capacity to withstand vibrations and liquid. There are poor-quality machine screws also available in the market, which are lower in price compared to them and can crack during high machine vibrations. Low-quality machine screws can rust when exposed to moisture. So, for long-lasting fastening, always choose a high-quality machine screw, irrespective of price.
Talking about their physical characteristics:
Machine screws give protection against rust and corrosion.
Aluminium machine screws are not as strong as stainless steel screws and are usually used where weight is a concern
Most machine screws are fully threaded from head to end, so they have the full length of the fastener shank.
Machine screw manufacturers recommend them as they are made to give more precision, better all-round quality, and thread uniformity.
Machine screws are used for fastening different types of material together, especially furniture. The most common uses include engines, electronic devices, large-scale industrial equipment, and vehicles.
Institutions use a machine screw by tapping or drilling it into a pre-cut hole or nut, either manually or with a screwdriver. Machine screws are also used along with nuts; in this case, the nut will go behind the rearmost component.
They are versatile in nature and are often used to join different components and their parts. Firearms have many parts that need to be attached, and so they use small machine screws as they are easy and tight to disassemble. They are also used in jigs in machining, fixtures, dies, and electrical connections
The alternative use of machine screws is to separate and secure parts which are to be kept at a fixed distance from each other. This is achieved through a type of threaded coupling which allows machine screws to be fixed in opposing directions. The length of the coupling inserted between the two fasteners will depend on the separation distance required between the components.
There is a range of machine screw sizes available in the market. So, knowing how to measure a machine screw is essential for choosing the ideal fastener for the machine.
Machine screws are sold by thread size and length. They come in different sizes and to be sure, always check the website or the guide given by the machine screws manufacturers.
LP Screw is one of the leading machine screws manufacturers. We are technologically advanced and produce more than 50 lacs of high-quality screws a day. Depending on the purpose, select the best machine screws from our wide range. The types and sizes of machine screws are:
They are commonly used for a solid grip in machines as they come with 4 points of contact. They provide fastening solutions in less time with minimum human effort.
Used in: Hinges, Tower Bolts, Wardrobe Sliding Channels, Drawer Channels and Furniture Handles
They are generally used to join brass or steel and can only fit through the tapped hole or nuts.
Used in: Furniture Pull Handles, Wardrobe Cabinet Handles, Fabrication of Electronic Devices, Making of Engines and Industrial Manufacturing Equipment
They are used in the making of furniture as they have high tensile strength and are easy to screw into wood.
Used in: Modular Kitchen, Door, Drawers, Wardrobe and Hinges
They give exceptional results and are used to fabricate furniture and make it more durable and long-lasting.
Used in: Fixing Wood to Wood, Fixing Aluminium to Wood, Modular Kitchen, Frame on the Wall and Mounting Tv on the Wall
They are machine-driven screws, used for strong bonding between wooden objects.
Used in: Ships, Wooden Frame Partition, Hardware, Shelves and Cabinets
The all-rounder machine screw is used for both metal and wood. It is less corrosive and requires less human effort to install.
Used in: Sofa Legs, Twin Wheel Castor, Auto Hinges, Bed Fitting with Pneumatic Pump and Bathroom Fitting
Machine screws are everywhere; manufacturers use them in everyday applications and also in more complex assemblies. Manufacturers also produce them in imperial sizes, but this blog post will focus on metric machine screws. We will talk about their uses, common head types, common drives and the materials they are usually available in. Additionally, this will also act as a starting point for more specialised posts on the various types available.
Or what is a machine screw? A machine screw is a type of precision fastener that holds two components together. As standard, these screws are typically fully threaded and can be screwed into a tapped hole with a driver. Alternatively, you can be insert them into an unthreaded hole and tightened with a nut, or a nut and washers from the other end.
Manufacturers produce these precision-made screws to strict tolerances, adhering to the exacting standards of both DIN and ISO specifications, with many variations available.
Manufacturers usually produce them in the standard metric coarse pitch and typically make them in smaller sizes than other types of bolts. Furthermore the most common machine screw sizes range between M1.6 – M6 but they can also less commonly be available in larger diameters.
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These screws are virtually always fully threaded from just under the head to the end of the screw. The tip of the screw is always flat and not pointed.
All sorts of industries widely use machine screws. Common uses are to attach various materials like boards and panels in many materials like plastics and metals etc.
They are an essential component in manufacturing, automotive, electronics, assembly and construction, to name a few of the more common industries.
Machinery Manufacturers commonly use them in the assembly of their machines, hence the name machine screws.
There are many common machine screw types and some not so common. I will focus on the main everyday readily available ones.
Clicking on any of the links below will take you to a more in-depth post on each type of machine screw. You can learn more about each one and their unique characteristics.
When deciding what machine screw to use for your application, you should take the following into consideration.
Everyday production primarily uses the following machine screw sizes.
Machine Screws M1.6
Machine Screws M2
Machine Screws M2.5
Machine Screws M3
Machine Screws M4
Machine Screws M5
Machine Screws M6
As for, what length are machine screws. They come in varying lengths from different manufacturers and can vary depending on the drive type and material.
This can be a cause for confusion to many people, I will explain below how to go about measuring a machine screw.
To measure a countersunk machine screw, you measure the entire length from the top of the head to the end of the thread. However, you measure machine screws with a raised type head, like a pan head machine screw, differently. Unlike countersunk screws, you measure them excluding the head, starting from under the machine screw head to the tip of the thread.
On smaller diameter screws it can be near impossible to measure the thread diameter with a ruler. It is advisable to measure the outer diameter of the threads with a digital caliper. To give you an accurate measurement use one that measures in hundredths of a millimeter.
Example of how to work out a machine screw size:
The “m” size represents the outer thread diameter measurement. If the thread diameter measures 5mm, then the screw is an M5.
Depending on if you were measuring a countersunk or a raised type head screw. You would use the rule mentioned above to get the length of the screw. Let’s say the length is 20mm.
In conclusion then , if you had a screw at 5mm diameter and 20mm length then it would be an M5x20
On all of our machine screws product pages, on the right hand side near the top there is a tab called Product Dimensions, you will find the dimensions for each type of screw on there.
If you click the links next to the images above, you will find a dimensions chart on each of the related blog posts for each type of machine screw.
Machine screws come as standard in many different materials for various applications. You should give consideration to environmental factors and strength requirements when deciding what material to use.
Some of the most common materials that a machine screw is made of include bright zinc-plated steel, as well as yellow zinc-plated and black zinc-plated. A2 stainless steel & A4 stainless steel, brass and nylon.
This all depends on what you are working with and will vary from application to application. Often, a machine screw will be screwed into a pre-threaded hole with or without a washer and tightened using a screwdriver.
Alternatively, they can also be inserted through aligning pre-drilled holes and fastened together with a nut and washer if required.
If you consider the environment that machine screws will be exposed to and make an informed decision on the material used then they will not rust.
Just a couple of examples. If you are using machine screws outdoors then A2 stainless steel would be a good choice. If however you use them in or near salt water then A4 stainless steel would be a better option.
Machine screws are fundamental to many aspects of modern assembly and manufacturing. With a better understanding of their types, materials, and applications, along with proper selection and installation, you can tackle any project with confidence.
More detailed specific information on the various types available is provided on the related blogs posts for each type of screw. You can click any of the links above to read more about them. You will also find some useful machine screw size charts there as well.
Hope this post was helpful.
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