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Machine Screws.

Machine Screws

What are Machine Screws?

Machine screws are a versatile component, used across a myriad of industries for their robust fastening capabilities. They excel in scenarios requiring precise, strong connections, such as in electronics, machinery, and automotive assemblies.

In the UK, there isn't an official definition, but according to the American Society of Mechanical Engineers (ASME), machine screws have a maximum diameter of 0.75 inches (19mm). This means they are generally smaller than other types of screws.

For example, a countersunk machine screw is ideal for applications requiring a flush surface finish, while a pan head machine screw offers excellent grip for tools, making it suitable for manual adjustments. Their ability to securely join components makes them indispensable in both small-scale DIY projects and large-scale industrial applications.

Materials of Machine Screws.

These screws are crafted from a range of materials, each offering unique benefits.

A2 & A4 stainless steel machined screws provide corrosion resistance, making them ideal for outdoor or harsh environments. RENY, PPS, PEEK, Polycarbonate, and Nylon offer lightweight and non-conductive properties, suitable for electronic applications. Titanium machine screws, known for their strength-to-weight ratio, are perfect for aerospace and medical industries. Brass machine screws offer aesthetic appeal with corrosion resistance, making them a popular choice in architectural and marine applications.

Each material is carefully selected to ensure optimal performance in specific applications.

Sizes, Types, and Finishes.

Accu's machine screw sizes range from the minute M1.2 (1.2mm) to the substantial M30 (30mm), with lengths varying from 2mm to 300mm. This variety caters to a multitude of requirements, from delicate precision instruments to robust industrial machinery.

The fasteners also come with additional finishes like AccuBlack chemical blackening and AccuLock thread locking patches, enhancing their durability and security. Our machine screw size chart aids in selecting the perfect screw for every application.


What is the difference between a machine screw and a standard screw?.

Practically speaking, machine screws are specifically designed for precision applications, featuring a uniform diameter throughout and a range of head types for specialized uses. This means that unlike wood screws, which traditionally feature a pointed tip, machine are the opposite with a blunt tip matching the diameter of the entire shaft.

Can machine screws be used in outdoor environments?.

Yes, the machine-type family of screws has no bearing on material type and use cases, so, when made from materials like A2 & A4 Stainless Steel, which offer excellent corrosion resistance, they can certainly be used outdoors.

Are there any special finishes available?.

Yes, Accu offers two special finishes of an optional nature that can enhance both visual and performance once installed.

AccuBlack chemical blackening provides a matte black finish that is not only corrosion resistant but reduces reflections which is sometimes critical in the aerospace industry.

AccuLock thread-locking patches pre-apply thread lock to the shaft which can make installation much faster in production lines but also provides improved resistance against loosening under vibration.

How do I choose the right size screw for my project?.

The appropriate screw size for your project will consist of a careful analysis of your mechanical requirements and size. This should all be calculated prior to selecting your screw type, but if in any doubt, consult our engineering team for advice.

What materials are used for machine screws in electronic applications?.

Non-conductive materials like Polycarbonate, Nylon, and PEEK are commonly used in electronic applications for their insulating properties.

Bespoke Machine Screws Manufacture.

High precision, bespoke manufacture of Machine Screws to customer specification. State of the art facilities specialising in both small batch prototyping and large scale manufacture.

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