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The Range£4.85Visit shop Unifix Machine Screws Slotted Raised Csk Head Nickel Plated M3.5 X 40 - Grey
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The Unifix M3.5 x 50mm Slotted Raised Countersunk Machine Screws are ideal for professional contractors and DIY enthusiasts seeking a reliable fastening solution for wood, metal, and plastic projects. Featuring high-quality nickel plating, these screws provide excellent corrosion resistance and durability in various environments. While their slotted head design offers a classic aesthetic and straightforward installation, users should ensure they are using a well-fitting flat-head screwdriver to prevent cam-out during tightening.
| Colour | Silver |
|---|---|
| Model Part Number | ZZP10115 |
| Brand | Unifix |
M3.5 refers to the metric diameter of the screw shank, which is 3.5 millimeters.
The nickel plating offers good corrosion resistance, but they are primarily designed for indoor or protected outdoor use. For extreme environments, stainless steel may be a better choice.
These are machine screws, not masonry screws. They should be used with metal or plastic threads/nuts and are not designed to be driven directly into brick or concrete.
No, a standard flat-head (slotted) screwdriver is all that is required for installation.
The screw has a total length of 50mm.
Yes, once installed, the nickel-plated surface can be painted, though you may need to use a primer first to ensure the paint adheres correctly.
Ensure you are using a screwdriver with a blade that fits the slot width exactly. Applying consistent downward pressure while turning will also improve grip.
Verify that your countersink pilot hole is deep and wide enough to accommodate the raised countersunk profile of the screw head.
To ensure the best results, always drill a pilot hole if you are working with hardwoods to prevent splitting. Since these are machine screws, ensure the material threads or the receiving nut are compatible with the M3.5 metric thread pitch. Keep the screws in their original polybag when not in use to avoid moisture buildup or loss. If exposed to heavy outdoor elements, occasionally checking the screw head for signs of oxidation is recommended, although the nickel plating is specifically designed to mitigate this issue. Avoid using power impact drivers at high settings, as the slotted head design is better suited for controlled, manual hand-tightening to maintain the integrity of the slot.
