UNE-EN 4804:2017 Aerospace series - Flange couplings - Swivel flange with 4 fastening holes, in nickel alloy - Inch series (Endorsed by Asociación Española de Normalización in July of 2017.)
2017UNE-EN 4804:2017 Aerospace series - Flange couplings - Swivel flange with 4 fastening holes, in nickel alloy - Inch series (Endorsed by Asociación Española de Normalización in July of 2017.)