8-9×40-50 A2 SS304 T17 Square Drive Countersunk Screw with Slash Ribs

Product Features
304 Stainless Steel Material, Moisture and Rust Resistant: A2 austenitic stainless steel substrate, withstands rain and moisture, does not rust or stain wood even after prolonged outdoor use, suitable for various preservative‑treated timbers, and also stable in damp indoor areas.
T17 Cutting Point, No Pre‑Drilling and Split‑Resistant: The tip features chip‑clearing cutting flutes, eliminating pre‑drilling, with low driving resistance, reducing splitting in both soft and hard woods, significantly improving installation efficiency.
Internal Square Drive, High Torque and Anti‑Cam‑Out: The square recess provides tight engagement, reducing slippage and wear during power driving, suitable for high‑volume installation, with superior durability over ordinary cross recess screws.
Countersunk Head with Slant Ribs Design, Flush Finish: The tapered slant ribs automatically cut the countersink, allowing the screw to embed completely into the board, leaving no protrusions, eliminating the need for secondary sanding, and enhancing the aesthetic of surface installations.
Deep Coarse Thread, Strong Fastening: The deep coarse threads firmly engage wood fibres, providing pull‑out resistance and anti‑loosening; lengths of 40‑50 mm suit medium‑thickness boards for secure and lasting fixation.