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The Range£25.71Visit shop Unifix A2-304 St/St Tamper Tx Machine Screws M4 X 8 - Grey
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The Unifix A2-304 Stainless Steel Tamper TX Machine Screws (M4 x 8) are engineered for professionals and DIY enthusiasts who require secure fastening solutions that resist unauthorized access. Ideal for outdoor and indoor projects demanding durability, these screws are constructed from high-grade A2-304 stainless steel to prevent corrosion, though users should note that the specialized tamper-resistant drive requires a specific TX driver bit for installation and removal.
| Colour | Grey |
|---|---|
| Model Part Number | 1264266 |
| Brand | Unifix |
A2-304 stainless steel is generally non-magnetic, though minor magnetism can occur after cold-working during the manufacturing process.
Yes, A2-304 provides good corrosion resistance, though for direct salt spray exposure, consider if you need a higher grade like A4-316.
You need a Tamper-Resistant TX driver bit of the correct size to accommodate the security pin in the center of the head.
These follow the standard ISO metric thread pitch for M4 screws, which is 0.7mm.
Yes, the stainless steel surface can be painted if you use a high-quality metal primer first to ensure adhesion.
A2 denotes the austenitic grade of stainless steel, indicating it contains chromium and nickel for improved corrosion resistance.
Ensure you are using a dedicated Tamper-Resistant TX bit that features the center hole to accommodate the pin.
Verify the bit is fully seated in the head and reduce the torque speed of your power driver.
This is likely 'tea staining' caused by carbon steel residue; clean the area with a stainless steel passivating agent or light abrasive pad.
For a successful setup, ensure the pilot holes or threaded inserts are clean and free of debris. To install, align the fastener with the threaded hole and use the appropriate tamper-resistant TX driver bit, ensuring the pin in the center of the screw head is fully cleared by the bit cavity. Care for these fasteners is minimal due to the stainless steel composition; however, if used in extreme saline conditions, periodic cleaning with fresh water can help maintain the finish. Avoid using carbon steel tools during installation to prevent cross-contamination, which can cause surface rust on the stainless steel.
