: Often feature an "X" or asterisks on the head to identify them as aircraft-grade. Variations :
designates the bolt diameter (3/16 inch or 10-32 thread). AN3.7z
: Usually made of high-strength type 8740 alloy steel with a minimum tensile strength of 125,000 PSI. : Often feature an "X" or asterisks on
: Indicates an undrilled shank (used with self-locking nuts). "H" Suffix : Indicates a drilled head for safety wire. "C" Suffix : Indicates stainless steel material. AN3.7z
: Typically cadmium plated (silver-yellow appearance) for corrosion resistance.