SIMONSWERK GmbH has manufactured door hinge systems in Rheda-Wiedenbrück for more than 135 years, supplying the TECTUS concealed range and the VARIANT, BAKA and SIKU families to timber, steel, aluminium, PVC-U and glass doorset makers. Its hinges are tested and classified to EN 1935 and released for use on fire and smoke doorsets under DIBt allgemeine bauaufsichtliche Zulassungen and CE marking to EN 16034, with test and certification work carried out at ift Rosenheim; the UK company markets the same ranges to BS EN 1935 with CE/UKCA declarations of performance. It also supplies KEEP CLOSED magnetic closing systems for self-closing leaves and provides RIBA-approved CPD for specifiers.