These MS21250-02004 12 point flange bolts were manufactured using domestic 8740 AMS 8322P steel material heat treated to AMS 2759/1 F AMS 2759 F to reach hardness of 40-43 HRC. The parts were finished with CAD plating per AMS-QQ-P-416E specification, Type II Class 2. Full certs were provided with the parts to our aerospace customer per order requirements.