Stud, Stepped, Drilled, Necked, Wrench Pad, 2 Dia. Engagement, .5625-12 x .50
About AN Part Classifications
The prefix before the part number indicates the authoritative organization that sets the definitive specifications for the component. AN represents Army-Navy Aeronautical Standard, which sets the precise guidelines for material, size and other characteristics for parts such as aerospace fasteners. Because these parts are being used in commercial and military applications that may be exposed to intense pressures, they require a strict level of precise quality.