designates the bolt diameter (3/16 inch or 10-32 thread).

: Often feature an "X" or asterisks on the head to identify them as aircraft-grade. Variations :

: Typically cadmium plated (silver-yellow appearance) for corrosion resistance.

(e.g., AN3-7) determines the length. A "long" version would be indicated by a higher dash number, such as an AN3-7 , which has a total length of approximately 25/32 inch (0.781 inches) and a grip length (the unthreaded portion) of 7/32 inch . Key Characteristics of AN3 Bolts

: Usually made of high-strength type 8740 alloy steel with a minimum tensile strength of 125,000 PSI.