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OnBuy.com£1.90Visit shop R-Tech 337117 Pozi Countersunk Self-Tapping Screws No.4 1/2In 13.0Mm - Pk100 5053556010301
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The R-TECH 337117 Pozidriv Countersunk Self-Tapping Screws are designed for DIY enthusiasts and professionals who need a reliable, flush-finish fastening solution for wood, plastic, or sheet metal projects. Featuring a bright zinc-plated finish for enhanced corrosion resistance, these No. 4, 13mm screws offer excellent durability in various applications, though they require a pilot hole in denser materials to prevent stripping or splitting.
| Colour | Silver |
|---|---|
| Model Part Number | 337117 |
| Brand | R-TECH |
They feature a zinc-plated finish for corrosion resistance, making them suitable for interior and sheltered exterior use, but they are not recommended for permanent marine or highly corrosive environments.
No.4 refers to the standard gauge of the screw diameter, which in this case is 2.9mm.
While these are self-tapping, using a pilot hole is highly recommended when working with hard woods or metals to ensure a cleaner finish and prevent material damage.
While they might fit, a Pozidriv bit is specifically designed for these screws and will offer much better grip and less risk of cam-out.
The screw length is 13mm, measured from the top of the head to the tip.
Ensure the screwdriver bit size matches the Pozidriv specification and reduce the speed or torque of your power drill.
Use a countersink bit to create a small bevel in the pilot hole, allowing the screw head to seat properly.
The pilot hole is likely too small or non-existent; increase the pilot hole diameter slightly.
For optimal results, ensure you are using a correctly sized Pozidriv screwdriver bit to match the head. Avoid using high-impact power drills on the highest torque settings to prevent stripping the head. These screws are designed for general interior or light exterior use; if using in damp outdoor conditions, consider regular inspection for signs of surface oxidation. Store in a cool, dry place to maintain the integrity of the zinc-plated finish.
