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The Unifix A4-70 Stainless Steel Socket Countersunk Head Screws are designed for professional tradespeople and DIY enthusiasts who require high-performance, corrosion-resistant fastening solutions. These M4 x 16 screws offer superior durability for outdoor or marine environments, though they require a hex key drive rather than a standard screwdriver, which may necessitate specific tooling.
| Colour | Silver |
|---|---|
| Model Part Number | 1262029 |
| Brand | Unifix |
A4 indicates marine-grade stainless steel with added molybdenum for corrosion resistance, and 70 refers to the tensile strength class.
Yes, they provide a very clean, flush finish, though they are specifically optimized for corrosion resistance.
These are M4 size screws designed for standard ISO 10642 countersunk applications.
A4 stainless steel is generally non-magnetic or only very weakly magnetic due to the cold-working process.
Each box contains 200 units of the M4 x 16 screws.
Ensure a pilot hole has been drilled to the correct diameter before insertion.
Verify that the hex key is the exact size required and fully seated in the socket.
To install, clear any debris from the pilot hole. Use a compatible hex key or an Allen bit for a power drill set to low-to-medium torque. If installing into stainless steel or aluminum, consider using a lubricant to prevent thread galling, which can lock the screw permanently in place. After installation, wipe away any metal shavings from the surface to maintain the aesthetic appearance and prevent surface contamination.
