![]() The keyed-hook scarf is common in ship and boat-building, as well as timber framing and wooden bridge construction. The use of modern high-strength adhesives can greatly increase the structural performance of a plain scarf. The plain scarf is not preferred when strength is required, so it is often used in decorative situations, such as the application of trim or moulding. Interlocking scarf joints, such as a hooked, keyed, and nibbed scarves, offer varying degrees of tensile and compressive strength, though most still depend on mechanical fastening to keep the joint closed. A plain scarf is simply two flat planes meeting on an angle relative to the axis of the stock being joined, and depends entirely on adhesive and/or mechanical fasteners (such as screws, nails, or bolts) for all strength. In woodworking, there are two distinctly different categories of scarf, based on whether the joint has interlocking faces or not. It is an alternative to other joints such as the butt joint and the splice joint and is often favored over these in joinery because it yields a barely visible glue line. ![]() The scarf joint is used when the material being joined is not available in the length required. The scarf joint used on the beams above the post is known by its French name, trait de jupiter or "bolt-o-lightning joint".Ī scarf joint (also known as a scarph joint) is a method of joining two members end to end in woodworking or metalworking.
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