AN6 Bolts -- Undrilled Head
AN6 bolts have a 3/8-24 UNF thread and a 3/8" diameter shank. The 0.641 inch thread length on all AN6 bolts is designed to fit a full-height nut plus one AN960-616 washer.
A or no A? AN bolts were originally designed to be used with a castle nut and cotter pin, so the base part number indicates a drilled shank. The addition of an "A" at the end (for example, AN6-13A) indicates an undrilled head and an undrilled shank for use with a self-locking nut.
AN bolt nomenclature can be confusing. Please take a look at our page on Identifying AN Bolt Sizes.
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