SFS Doppelsenk Flügelbohrschrauben T znb SC5/41-DS12 5,5x55

The Torx drive is standardised in accordance with ISO 10664. The TORX PLUS® is a further development of the tried-and-tested TORX® drive system. The TORX PLUS® drive system is also available with the AUTOSERT® function. The AUTOSERT® consists of composite angular guide ramps. These allow a bit rotating at high speeds to engage with the recess.

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.

Blue galvanised finishes are produced either by electroplating in accordance with DIN EN ISO 4042 or by mechanical plating in accordance with DIN EN ISO 12683. For fasteners with a hardness exceeding 390 HV, there is a risk of hydrogen embrittlement during galvanising (electrolytic process). This necessitates specific measures (such as annealing), although these do not provide a 100 per cent guarantee against embrittlement.