Schöler + Bolte shear connectors are CE-conform
Evidence of Schöler + Bolte headed studs is provided by compliance of the requirements of CPD and the following European standards and approvals such as DIN EN 10025-1:2005-02 "Hot rolled products of structural steels - Part 1: General technical delivery conditions", DIN EN 10025-2:2005-04 "Hot rolled products of structural steels - Part 2: Technical delivery conditions for non-alloy structural steels" and ETA-11/0120 "Steel plate with cast-in anchor(s)".
The EC declaration of conformity can be found here.