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Power Tools Direct£0.91Visit shop Forgefix Fpmsph420 Machine Screw Pozi Compatible Pan Head Zp M4 X 20Mm Forge Pack 18
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B&Q£4.60Visit shop B&Q - Fpmsph420 Machine Screw Pozi Compatible Pan Head Zp M4 X 20mm Forge Pack 18 Forfpmsph420
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The Forgefix Pozi Pan Head Machine Screw is designed for professionals and DIY enthusiasts who require reliable fastening for use with nuts or pre-tapped holes. Its primary benefit is the specialized Pozidriv head geometry, which allows for significantly higher torque application and reduced risk of cam-out during installation compared to standard Phillips drivers. While these screws offer excellent versatility for electrical, plumbing, and ironmongery projects, users should note they are not self-tapping and require a pre-threaded hole or matching nut for proper installation.
| Colour | White |
|---|---|
| Model Part Number | FPMSPH420 |
| Brand | Forgefix |
No, these are machine screws intended for use with pre-tapped holes or nuts.
While it may fit, it is not recommended as it will lead to cam-out and head damage; use a Pozidriv driver for best results.
M4 refers to the 4mm metric diameter of the screw shank.
They are zinc-plated for mild corrosion resistance, but are best used in dry or indoor environments.
Look for the embossed lines on the head between the cross-slots; this is the hallmark of a Pozidriv head.
Ensure you are using a correct Pozidriv (PZ) bit, not a standard Phillips (PH) bit.
Check the tapped hole for metal debris or paint buildup; clean the threads with a tap if necessary.
Verify that the hole is threaded for M4 size and is not obstructed.
For the best results, use a dedicated Pozidriv screwdriver bit (PZ size) rather than a standard Phillips bit to prevent damaging the head. Ensure the mating surface is flat and the tapped hole is clean of debris before installation. If using with a nut, ensure the threads match the M4 metric pitch perfectly to avoid cross-threading. While the zinc plating provides moderate protection, avoid exposure to harsh chemicals or highly acidic environments. Periodically check the torque of the fasteners in high-vibration applications to ensure they remain secure.
