DIN EN 4297 : 2017 Title: Aerospace series - Nuts, hexagon, self-locking by plastic ring, normal height, normal across flats, in corrosion resisting steel, passivated - Classification: 900 MPa (at ambient temperature) / 120 °C; German and English version EN 4297:2017 Year: 2017 Publisher: DIN Media GmbH Availability: Within 1-2 working days