Technical details

• Archived AN510 revision 6 (30 June 1994) specifies AN510C6R5 as an 82-degree flat-head, cross-recessed screw with #6-40 UNF Class 2A threads.
• The exact size row specifies nominal length .3125 in, with +0/-.03125 in tolerance. The material requirement is corrosion-resistant steel.
• Material code C specifies passivated corrosion-resistant steel; the row does not carry an undercut-head designation.
• Drawing note 6 excludes these screws from airframe construction and from attaching equipment to an airframe.
• These are dated design requirements. Current supplied-lot conformity, certification and installation approval are unverified.