Grade 9 Hex Head
The Grade 9 Bolting system develops the highest clamp force available in a standard bolt/nut assembly and it is
frequently referred to by one of the folowing trade names: L9, PFC9, or F911. Special Alloy steels and heat treatments are used to achieve 180,000 psi tensile strength.
Grade 9 -- Yellow Zinc Chromate -- 180,000 PSI
F911 is Hillco's Grade 9 product of choice. However, we may sometimes substitute a comparable product, such as L9 or PFC9 if F911 is not available.