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OnBuy.com£12.27Visit shop Unifix A2-304 Self-Tapping Screws 4G X 1/2" - Q207982c00290013000 - Box Of 1000 5014196318011
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The Unifix A2-304 Stainless Steel Self-Tapping Screws are designed for professional contractors and DIY enthusiasts who require reliable, long-lasting fastening for wood and metal projects. Engineered with high-quality A2-304 stainless steel, these screws provide exceptional corrosion resistance and a secure Pozi Countersunk head for improved torque control; however, users should ensure they have the correct pilot hole size, as these are self-tapping rather than self-drilling in harder materials.
| Colour | Silver |
|---|---|
| Model Part Number | Q207982C00290013000 |
| Brand | Unifix |
These are A2-304 stainless steel, which is rust-resistant. However, for direct contact with salt water, A4-316 grade is recommended.
While these can be self-tapping, drilling a small pilot hole is recommended to prevent splitting the wood, especially near edges.
4g refers to the gauge or diameter of the screw, which is approximately 2.9mm.
A2-304 stainless steel is typically non-magnetic, though minor magnetism may occur due to the cold-working process during manufacturing.
It is highly recommended to use a Pozi bit to match the head. While a Phillips bit may fit, it increases the risk of cam-out and stripping the head.
Ensure you are using the correct size Pozi bit and reduce the speed or clutch setting on your power drill.
Verify that your pilot hole is the correct size for a 4g screw; the hole should be large enough to guide the tip but small enough for the threads to cut into the material.
Clean the surface with a stainless steel cleaner; avoid cross-contamination with carbon steel tools, which can deposit microscopic iron particles that may rust.
To ensure the best results, always select the appropriate driver bit size to match the Pozi head recess, which helps prevent stripping.
