AN4H Bolts -- Drilled Head
AN4H bolts have a 1/4-28 thread and a 1/4" shank diameter. The 0.469 inch thread length on all AN4H bolts (except AN4H-3A, which has 0.406 inch thread length) is designed to accommodate a full-height nut plus one AN960-416 washer. The head of each AN4H bolt is predrilled for safety wire.
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, AN4H-15A) indicates a drilled head and an undrilled shank for use with safety wire and 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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