DIN EN 4309 : 2017 Title: Aerospace series - Nuts, hexagon, self-locking by plastic ring, normal height, normal across flats, in alloy steel, cadmium plated - Classification: 900 MPa (at ambient temperature) / 120 °C; German and English version EN 4309:2016 Year: 2017 Publisher: DIN Media GmbH Availability: Within 1-2 working days