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eBay£5.50Visit shop M6 x 50mm COUNTERSUNK MACHINE SCREWS x 10 POZI DRIVE STAINLESS STEEL A2 DIN 965
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The Range£7.59Visit shop Unifix A2-304 St/St Machine Screws M4 X 10 - Q209650000400010000 - Grey
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The Unifix A2-304 Stainless Steel Machine Screws are ideal for professional tradespeople and serious DIY enthusiasts requiring reliable, corrosion-resistant hardware for wood, metal, and plastic projects. These screws feature a precise Pozi countersunk head that allows for a professional flush-fit finish, though users should ensure they are using the correct Pozi-drive screwdriver bit to prevent cam-out during installation.
| Colour | Grey |
|---|---|
| Model Part Number | 5014196321530 |
| Brand | Unifix |
While A2-304 stainless steel provides excellent general corrosion resistance, for extreme marine environments (salt spray), A4 (316 grade) is typically recommended. These are best suited for general indoor/outdoor use.
Yes, for most materials, drilling a pilot hole is recommended to prevent splitting and to ensure the screw threads seat correctly.
It is not recommended. Pozi-drive screws have an additional set of marks that require a specific Pozi bit for full torque transfer.
It is a German industrial standard defining the dimensions and manufacturing requirements for countersunk head machine screws with a cross recess.
A2-304 stainless steel can exhibit mild magnetic properties due to the cold-working process used to form the screws, but this does not affect their corrosion resistance.
Ensure you are using the correct size Pozi-drive bit; a Phillips bit will not fit securely and will cause the screw to cam out.
Drill a properly sized pilot hole to reduce friction, especially when working with denser hardwoods or metals.
Check if carbon steel tools were used during installation, which can leave particles that rust. Clean with a stainless steel-safe cleaner.
To install, ensure you are using a screwdriver or power drill set to low torque with a compatible Pozi-drive (PZ) bit. Because the screw features a countersunk head, use a countersink drill bit first to create a matching bevel in the material, ensuring the screw head sits perfectly flush. For maintenance, these screws are naturally resistant to oxidation, but if they are exposed to coastal environments, an occasional wipe with a clean cloth can help remove salt buildup. Avoid using tools that have been previously used on carbon steel to prevent cross-contamination of metallic particles, which can sometimes lead to localized surface rust on stainless steel items.
