The quality of our products is regularly examined and assessed at our factory by the independent Materials Testing Institute University of Stuttgart MPA (= Materialprüfunsanstalt) and DVS ZERT (= Deutscher Verband für Schweißen Zertifikat). Our production plant is approved as a welding shop for steel construction products based on DIN EN ISO 3834-2 and is therefore permitted to produce structural steel components up to EXC3 according to EN1090-2.

Product approvals

Special certificates

Field manual for head-side preloading of high-strength bolt and nut assemblies

Field manual for M16, M20, M24, M27, M30 & M36 bolts according to DIN EN 14399-4 PDF [in German], 1.723 KB


Individual approval of spherical bearings with uplift protection device granted in the context of an individual case approval (ZiE)

ZiE for pull/push spherical bearings PDF [in German], 250 KB