ULTRACUT concrete screw hexagon head FBS II 8 CP US TX 8x55

The wrench sizes for hexagon bolts and nuts are specified in ISO 272: 1982-01. The relationship between the nominal diameter d of the thread and the wrench size s is standardised in EN ISO 4014 and EN ISO 4017 for hexagon bolts, and in EN ISO 4032 for hexagon nuts (dimensions in mm). The additional internal hexagon socket is used for re-use or in confined spaces.

Steel is an iron-carbon alloy with a maximum carbon content of 2% by mass. The steels achieve their intended physical and mechanical properties through various hardening, annealing and tempering processes. It is also possible to harden the edge zone by surface hardening, case hardening or nitriding. Well-known steel grades are structural steels, free-machining steels, case-hardening steels, nitriding steels, tempering steels, tool steels and stainless steels.

The fischer corrosion protection spray FCT-CP permanently protects galvanized screws from corrosion. The non-dripping spray professionally prevents moisture from penetrating the screw shaft.