DIN EN 4121 : 2015 Title: Aerospace series - Shank nuts, serrated, self-locking, in heat resisting steel FE-PA2601 (A286), silver plated on thread - Classification: 1 100 MPa (at ambient temperature) / 650 °C; German and English version EN 4121:2015 Year: 2015 Publisher: DIN Media GmbH Availability: Within 1-2 working days