boltbundna

Boltbundna is a term used in mechanical engineering and related fields to describe a binding technique that employs multiple bolts to join two or more members into a single, load-distributing connection. In practice, boltbundna connections clamp parts together along a grid or cluster of fasteners, allowing forces to be shared across many bolts rather than carried by a single fastener.

The term is encountered in Nordic engineering literature, where boltbundna is described as a method that increases joint stiffness and redundancy. The concept emphasizes distributing axial, shear, and moment loads through several bolts arranged to optimize contact pressure and minimize stress concentrations at any one bolt hole.

Construction methods commonly involve through-bolts or blind bolts arranged in a deliberate pattern. Components are aligned precisely, spacers or shims may be used to control gaps, and bolts are preloaded to achieve consistent clamping force. Nut types, washers, and, where necessary, locking elements are selected to maintain preload under operating conditions. Materials may include wood, steel, or composite members, with joint design adjusted to material properties and expected service loads.

Applications of boltbundna vary from timber frame connections and modular steel assemblies to certain civil and marine structures where redundancy and uniform load distribution are advantageous. Benefits of this approach include improved load transfer, easier inspection of multiple fasteners, and the potential for easier disassembly. Limitations include higher fabrication precision requirements, greater drilling or tapping of components, and sensitivity to corrosion or loosening if fasteners are not adequately secured.

See also: bolted joint, through-bolt, shear connection.