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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Round heads are domed and look like half of a sphere. Phillips drive is x-shaped for installation with a phillips screw driver.
A low carbon steel for general use. Zinc plated for moderate corrosion resistance.
Solid brass. An alloy of primarily copper and zinc with good corrosion resistance. Used mostly in decorative and electrical applications. Exact color varies.