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The Unifix Machine Screws Pozi Pan Head DIN 7985Z BZP (M4 x 20) are essential fasteners designed for both DIY enthusiasts and professional tradespeople needing reliable connections in wood or metal projects. These screws offer excellent grip and corrosion resistance thanks to their Pozi pan head design and Bright Zinc Plated finish, though users should ensure they are using the correct M4-compatible pilot holes or threaded inserts to avoid stripping the metal threads.
| Colour | Silver |
|---|---|
| Model Part Number | 1262975 |
| Brand | Unifix |
M4 refers to the 4mm thread diameter, and 20 refers to the 20mm length of the screw shank.
While it may fit, it is not recommended. Use a Pozi driver to ensure proper grip and avoid damaging the screw head.
They are Bright Zinc Plated, which offers basic corrosion protection but is intended primarily for indoor or sheltered use.
This is a German standard that defines the dimensions and design specifications for pan head machine screws with a Pozi cross-recess.
Yes, if driving into hard materials like wood or dense plastic, a pilot hole will prevent material splitting.
Ensure you are using a Pozi-specific driver bit rather than a Phillips head screwdriver.
Verify that the receiving hole is correctly tapped for an M4 metric thread and is free of debris or paint.
Wipe with a clean cloth and apply a light machine oil; consider using stainless steel hardware for high-moisture locations.
For optimal results, always use a dedicated Pozi screwdriver or bit rather than a standard Phillips head, as the internal geometry is slightly different and using the wrong tool can damage the screw head. When installing into wood, pilot drilling is recommended to prevent the timber from splitting. For metal installations, ensure the receiving hole is threaded to match the M4 specification. To maintain the Bright Zinc Plated finish, avoid using these screws in high-moisture or salt-heavy environments, as the zinc coating is designed primarily for internal corrosion protection. If you notice signs of surface oxidation, a light application of machine oil can help preserve the threads.
