#12 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.
July 31, 2015
poor fit of the driver bit would not allow screw to be properly driven. Cam out occurs way too soon.
June 6, 2013
Have built several boats, all of which "lived" on salt water. Silicone bronze, in my opinion is the only BELOW THE WATERLINE fastener to be used, unless one is dealing with a "throw away" project.
August 23, 2010
ABLE TO DRIVE WITH SCREW GUN OTHER BRANDS BROKE WHEN DRIVEN BY HAND.