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Countersunk Screws
Countersunk screws, also known as countersunk machine screws, are designed with a conical head that sits flush with the surface of the material once installed. This provides a smooth, low-profile finish that is ideal for woodworking, cabinetry, metal fabrication, electronics, machinery and general assembly tasks across the UK. Our range includes both durable nylon countersunk screws and high-performance stainless steel countersunk screws, catering to a wide variety of applications and industries.
What Are Countersunk Screws?
A countersunk screw features a tapered head designed to fit into a matching countersunk hole, allowing the top surface of the screw to sit level with or below the surrounding material. This design eliminates snag points, improves aesthetics and offers a professional finish. Countersunk screws are widely used in furniture production, electrical enclosures, machine components and applications where a flush fit is essential.
Product Range and Standards
We stock stainless steel countersunk screws in metric thread sizes from M3 to M24, offering excellent corrosion resistance and high strength for demanding or outdoor environments. Our nylon countersunk screws, manufactured to DIN 965, are available from M3 to M10 and are ideal for lightweight, non-conductive or corrosion-sensitive applications.
For engineered applications requiring specific standards, we offer popular variants including:
- DIN 7991 Torx Countersunk Screws – preferred for high torque control and reduced cam-out
- ISO 10642 Countersunk Hex Head Screws – widely used in machinery and mechanical assemblies
Why Choose Stainless Steel Countersunk Screws?
Our stainless steel countersunk screws provide exceptional corrosion resistance, strength and longevity. They are especially suitable for outdoor installations, marine environments, chemical exposure, and any application requiring a fastening that will not corrode over time.
Common UK Applications
- Furniture assembly, cabinetry and carpentry work requiring a flush finish
- Metal fabrication, sheet metal fixing and machine assembly
- Electronics, terminal housings and product casings
- Automotive and engineering applications where clean installation is important
- General purpose fastening using reliable stainless steel countersunk screws
If you require M10, M4, M5 or other popular sizes, we stock them as standard. For less common thread sizes or specialist variants, our team can often supply on request.
For assistance selecting the right countersunk screws for your project, please contact our experts on 01233 713581 for guidance on materials, thread sizes and standards.
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Frequently Asked Questions
What is a countersunk screw?
Countersunk screws have been specifically designed to sit flush to the surface of the application that they are being fastened to. They feature a flat screw head, which has a sloping, conical bottom. This has been shaped to fit into the countersunk holes that must be drilled into the application's surface before installing the screw. Other common types of screws, such as the socket head screw or the button head screw would not fit flush to the surface that they are drilled into. This means that the screw head would stick out and not be flat against the object they were drilled into. Countersunk screw heads on the other hand, will sit flat against the drilled surface.
What types of stainless steel countersunk screws are there?
Stainless steel countersunk screws are often differentiated by the type of recess that is found on the screw head. As part of our standard catalogue, we sell five different styles of stainless steel countersunk screws. This includes countersunk hex screws, countersunk phillips screws and countersunk pin torx screws. We also offer stainless steel countersunk machine screws with a slot drive and countersunk machine screws with a torx recess. Machine screws have been designed for increased precision and mechanical strength and are generally better for fastening in metals or other hard materials. If you require a dimension or style of screw that isn't listed please get in touch, as we are often able to source additional requirements.
What are stainless steel countersunk screws also known as?
Stainless steel countersunk screws are often also described as stainless steel countersunk bolts. Many people will use the terms screws and bolts to describe the same fastening product. Additionally, customers will typically refer to them as simply, stainless countersunk screws or stainless countersunk bolts.
Do you sell m4 stainless steel countersunk bolts?
We are pleased to sell all of the commonly requested sizes of stainless steel countersunk bolts that customers find most useful for projects in the UK market. This includes the popular m5 stainless steel countersunk bolts. We also supply these in the commonly requested m5 x 70 and m5 x 60 thread lengths. In addition to this, we stock m4 stainless steel countersunk bolts and m6 stainless steel countersunk bolts, which are another customer favourite. Our range of metric thread sizes begins at m3 and increases at intervals up to m24. If you require a size or thread length that isn't shown, please contact us.
What are stainless steel countersunk bolts used for?
Stainless steel countersunk bolts are used primarily for their excellent resistance to corrosion and their ability to combine a secure fastening with a clean looking finish. Stainless steel countersunk screws are not a cheap fastening solution. However, the balance of durability, performance and clean aesthetics that they provide has led to them being used commonly across a wide range of industries and applications in the UK. You may see stainless countersunk bolts used in construction, to secure panels, cladding and roofing materials. Stainless countersunk screws are frequently used in woodwork, because they allow assembly of furniture, cabinets and other wooden pieces without any visible protrusions along the surface of the wood. Similarly, A4 marine grade countersunk screws are a popular fastening solution on boats and ships. Their ability to resist saltwater corrosion and simultaneously offer an aesthetic finish flush to the boat's surface is particularly valued on luxury vessels.
What are the standard dimensions of an M8 screw?
An M8 screw has a nominal major diameter of 8mm, which is the measurement across the outer edge of the threads. The standard coarse thread pitch for M8 screws is 1.25mm, meaning there's a 1.25mm distance between adjacent thread peaks. The minor diameter (core diameter) is approximately 6.647mm, whilst the pitch diameter sits at 7.188mm. When specifying M8 screws, the full designation appears as M8×1.25, though the pitch is often omitted when referring to standard coarse threads. These dimensions conform to ISO 262 metric thread standards, ensuring compatibility across different manufacturers and applications.
What are the advantages of stainless steel countersunk screws?
Stainless steel countersunk screws provide excellent corrosion resistance, making them ideal for outdoor, marine, chemical and high-moisture environments. Their flush-fit head design offers a clean aesthetic while maintaining strong mechanical performance. This combination makes stainless steel countersunk screws a preferred choice for long-lasting, professional-grade installations.
When should I use stainless steel countersunk screws instead of nylon or zinc-plated options?
Stainless steel countersunk screws should be used when strength, durability and corrosion resistance are essential. They outperform nylon and zinc-plated screws in demanding environments such as construction, metalwork, automotive engineering and outdoor applications. If the installation may encounter moisture or requires long-term stability, stainless steel is the most reliable choice.
How fast can I get my order?
Need your parts tomorrow? Our rapid same day dispatch has got you covered! Simply place your order before 4pm Mon-Thurs or 2pm Friday and select our Next Day Delivery service in the shopping cart. We also offer Guaranteed AM delivery when required, in addition to a Saturday delivery option.
If you don't mind waiting, we have a Free delivery method for orders over £30, and an economic £4.85 2nd Class delivery for orders between £20-£30.
Can I get a Free Sample?
Free Samples can be requested through our product pages, displayed in the sizing table beside the product you require. Please note you can always give us a call on 01233 713 581 or contact us on Live Chat to discuss samples.
Do I need to Sign Up for an account?
You do not need to sign up to place an order, but it is recommended if you'd like to gain loyalty points, giving discount off future orders. To learn more about loyalty points, please view our rewards scheme page.
I am not sure what parts I need?
If you're unsure which part you need then please do not hesitate to give one of our friendly Sales Team a call on 01233 713 581 and they can assist you. Alternatively, we're active on Live Chat during office hours. You can open this using the button in the bottom right corner of the website. Alternatively, you can write to us using our contact form.
Do you offer Returns on Products?
We offer a return period on all of our products to give you peace of mind, to view our policies and learn more about this process should it be required, please see our returns policy page.
Can you supply different colours of this product?
In most cases we have the facilities to offer you different colours of a product, specific to your requirements. Minimum order quantities may apply depending on the manufacturing technique in question, but please get in touch with any queries you may have.
Is there a minimum order value?
Please note that there is a minimum order value of £10 through our website (inclusive of VAT).
If you're new to our website you may want to check out our frequently asked questions section for answers to common customer queries.
What do these abbrievations mean?
While browsing the website you may come across abbreviations used for material names that you are unfamiliar with. You can find an explanation for these in our material abbreviations guide.