Similar to the SDWH Timber screw. Has a large washer head, and is suitable for marine and coastal projects. A hexagonal head for use with a wrench.
Carbon steel for adequate strength. Hot dipped galvanized (A153) for very good corrosion resistance.
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Pan heads are slightly rounded with short vertical sides. Square drive is designed to reduce the risk of cam-out (stripping) and allow single-handed installation.
The most common stainless steel for general hardware use.
Heat treated for adequate strength. Zinc plated for moderate corrosion resistance.