kiinnitysreikiin

The Finnish term kiinnitysreik, literally “fastening hole”, refers to a precisely prepared opening in a structural element that is designed to accept a mechanical fastener such as a screw, bolt, or anchor. The word itself is a compound of kiinnitys (“fastening”) and reik (hole) and is commonly used in Finnish construction literature and trade manuals. In practice, a kiinnitysreik is not merely a random perforation: its diameter, depth, surface finish, and positioning are all specified to match the type of fastener and the loads that the joint will carry. The placement of a kiinnitysreik is determined by structural drawings, load calculations, and building codes; the hole often serves as the centreline for load transfer between two members.

The drilling of a kiinnitysreik is performed with a drill bit or a special milling tool, and the process may involve several stages: a pilot drill to create a shallow groove, followed by a final drill to the required diameter and depth. In wood construction the hole is usually tapered to allow gluing or self‑tightening screws, whereas in steel or concrete the hole is designed to accommodate wedges, expansion anchors or masonry bolts. For high‑strength applications, the hole may be pre‑cylindrical to facilitate the insertion of a keyed or cavity anchor that expands against the walls of the cavity to provide shear resistance. In timber framing a double‑headed timber bolt is commonly used; the hole is drilled through the full width of the member and a tapered block is inserted to create lock‑type fastening.

The design of kiinnitysreik adheres to national and European standards, such as the Finnish Standard KTL‑5040 for timber building or the Eurocode 2 for concrete structures. These standards dictate tolerances for diameter, depth, and minimum distances from edges to prevent tearing or cracking. Proper preparation of the hole surface is critical for preventing galling of metal fasteners and ensuring that adhesion to surrounding material remains intact. In addition, safety considerations include avoiding proximity to conduits, utilities, and corrosion‑prone zones. When executed correctly, a kiinnitysreik provides a robust mechanical connection that is reliable, durable and compliant with modern construction practice.