#14 Silicon Bronze Frearson Flat Head wood screws appear similar to the Phillips head but the Frearson has a more pointed 75° V shape. The Frearson tool recess is a perfect cross which minimizes cam out, unlike the Phillips head, which is designed to cam out.
Traditional boatbuilders love these Silicon Bronze wood screws because they have cut threads and the full-bodied diameter shank. Unlike rolled thread screws with their reduced shank--these screws have a shank diameter that is the same size as the outside of the threads. This completely fills the clearance hole normally drilled for the shank thus creating a waterproof seal.
Silicon Bronze is the traditional choice for marine construction. It is corrosion resistant, helps prevent rot around the screw holes when used under water, and is relatively strong. Although stronger than Solid Brass, Silicon Bronze screws are not as strong as Stainless Steel. They require a carefully sized pilot hole to avoid breakage. We recommend drilling twice (once for the root and once for the shank) as well as using a fastener lubricant to avoid breakage.
January 27, 2014
These wood screwa are being used for fastenings where frames are being replaced and sistered. They are a wire size larger than the old fastenings which is a standard step, insuring that they will have sufficient bite and holding power.
December 22, 2013
Silicon bronze fastenings are of the technology in use for many decades to build and repair or restore wooden vessels. New construction is easiest- but the refastening is tricky in extracting old screws which must be replaced. I find that Frearson style are easier to drive and extract than the single flat head slot.
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