A bolt with a hexagonal or square head and a special thread is one of the types of fasteners and is called a “capercaillie”. It is used to create mechanical bonds between two pieces of wood so that they are securely held together. These bolts are often used to fasten large beams and boards in finishing work, as well as wooden bridges and other wooden structures. They can also be used in concrete but require a special insert – dowel.
This fastener is directly screwed into the wood. The capercaillie has a large head, immediately followed by a small section of a smooth surface, and then a section with a thread turning into a pointed end. The threaded section contains a helical structure that allows the screw to be secured by clockwise rotation.
Capercaillie fasteners are tightened with a screwdriver or other tool. Bolts of this type can generate a high degree of clamping force when tightened. The mating surfaces are very firmly bonded and can remain bonded for quite a long time without loosening.
The size of the bolts is chosen according to the dimensions of the particular pieces of wood and the force required to secure the mechanical connection.
All fasteners, including capercaillie, are available in different versions from different materials. The purpose of their use, as a rule, determines the size and material. If you go to the SVM website, you can find a wide range of products, including capercaillie fasteners.
The most common bolt material is galvanized steel, which can provide some corrosion resistance at a reasonable cost. Stainless steel and bronze are also popular for applications where high corrosion resistance is not required.
