DIN 571 Hexagon Head Wood Screws

DIN 571 Hexagon Head Wood Screws are wood screws with an external hexagon head and a coarse wood thread, standardized under DIN 571. They are commonly identified in the market as hexagon head wood screws or hex head wood screws, while terms such as lag screws and coach screws may also be used for similar products. DIN 571 specifies the dimensional characteristics of screws with nominal thread diameters from 4 mm to 20 mm.

The external hexagon head allows the screw to be driven with a socket, spanner, or wrench rather than a screwdriver. This configuration is useful where higher installation torque or controlled tightening is required. The coarse wood thread is intended to engage directly with timber and other wood-based materials, making the product suitable for structural and general-purpose wood fastening applications within the limitations of the applicable design and approval requirements.

Typical applications include timber framing, wood-to-wood connections, construction hardware, carpentry, outdoor timber assemblies, and the installation of brackets, fittings, and other components onto wooden substrates. Selection should take account of screw diameter, length, timber characteristics, connection geometry, and required embedment depth.