Machine Screws
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About Machine Screws
Machine screws are precision-engineered threaded fasteners designed to secure components together, either by threading directly into a pre-tapped hole or by fastening with a nut. Unlike self-tapping screws, machine screws require a pre-existing threaded hole and are characterised by their uniform threading along the entire shaft. MyToolShed.co.uk stocks a comprehensive range of machine screws in various head styles including countersunk, pan head, and cheese head configurations, available in both slotted and Pozi drive options.
Our machine screw collection features quality products from trusted brands including Sirius, Timco, and Sealey, manufactured in materials ranging from bright zinc plated (BZP) steel to corrosion-resistant A2 304 and A4 316 stainless steel. Whether you need individual screws for specific applications or complete assortments for workshop stock, MyToolShed provides professional-grade fasteners suitable for both trade professionals and DIY enthusiasts.
Applications
Machine screws are essential fasteners used across numerous trades and industries:
- Mechanical and electrical assembly: Securing switchgear, control panels, and electrical enclosures
- Manufacturing and engineering: Precision assembly of machinery, equipment housings, and metal fabrications
- Electronics and computing: Fixing circuit boards, computer chassis, and electronic equipment
- Automotive and transport: Interior trim, dashboard components, and electrical fittings
- Furniture and joinery: Attaching metal brackets, hinges, and hardware components
- HVAC installation: Securing ductwork, access panels, and control boxes
- Maintenance and repair: General workshop and facility maintenance applications
Choosing The Right Machine Screws
Selecting appropriate machine screws requires consideration of several key factors:
- Head style: Countersunk heads sit flush with the surface, pan heads provide greater bearing area, whilst cheese heads offer maximum grip for slotted drives
- Drive type: Pozi drives provide better engagement and reduce cam-out, whilst slotted drives suit traditional applications and decorative requirements
- Material and finish: BZP offers economical corrosion protection for indoor use; A2 304 stainless steel suits general outdoor applications; A4 316 provides superior resistance in marine and chemical environments
- Thread size and length: Match thread diameter (metric M sizes) to your tapped hole or nut, ensuring sufficient thread engagement without excessive protrusion
- Quantity requirements: Individual packs for specific jobs or assortment sets like the Sealey 264-piece collection for comprehensive workshop stock
Frequently Asked Questions
What's the difference between machine screws and bolts?
Machine screws are typically smaller diameter fasteners (usually under 6mm) with threading along the entire shaft, designed to thread into tapped holes or nuts. Bolts are generally larger, have partial threading, and are specifically designed to be used with nuts.
Can I use machine screws in untapped holes?
No, machine screws require pre-tapped (threaded) holes or accompanying nuts. For untapped holes, you'll need self-tapping screws which cut their own thread as they're driven in.
Which stainless steel grade should I choose?
A2 304 stainless steel suits most indoor and general outdoor applications with good corrosion resistance. Choose A4 316 stainless steel for marine environments, coastal locations, or where exposure to chemicals or aggressive cleaning agents is expected.