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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 337115 Pozidriv Countersunk Self-Tapping Screws are designed for hobbyists, DIYers, and professionals looking for a reliable, flush-fit fastening solution for metal, wood, and plastic applications. These screws feature a bright zinc-plated finish for enhanced corrosion resistance, though they are specifically sized for smaller, precision-oriented tasks and may not be suitable for heavy-duty structural load-bearing projects.
| Colour | Silver |
|---|---|
| Model Part Number | 337115 |
| Brand | R-TECH |
They feature a zinc-plated finish, which provides basic corrosion resistance, but they are not rated for prolonged exposure to rain or harsh outdoor elements.
These screws are classified as No. 4 thread size, with a diameter of 2.9mm.
Yes, they are designed as self-tapping screws suitable for thin sheet metal, though a pilot hole is recommended.
You should use a compatible Pozidriv screwdriver or bit. Using a Phillips screwdriver may cause damage to the drive head.
The total length of this specific model (337115) is 6.5mm.
While they are 'self-tapping,' drilling a pilot hole is highly recommended for wood and thick plastic to ensure a secure fit and prevent splitting.
Ensure you are using a genuine Pozidriv bit rather than a Phillips head bit, and decrease the torque on your power driver.
Increase the size of your pilot hole to reduce the internal pressure exerted by the screw threads.
Use a countersink bit to create a small bevel in the material surface before driving the screw home.
For the best results, always drill a pilot hole smaller than the 2.9mm thread diameter before driving the screws into harder materials like wood or thick plastic. This prevents material splitting. Because these screws are zinc-plated, they are best suited for indoor use; if using in damp environments, regularly inspect for signs of surface oxidation. Store the remaining screws in a cool, dry place within their original packaging to prevent the zinc finish from degrading over time. Ensure the screwdriver bit is a true Pozidriv (PZ) type rather than a standard Phillips, as using the wrong tool can lead to head damage.
