AN5-21A Airframe Bolt

Part Number: AN5-21A

AN5-21A Airframe Bolt, Inventory: 1120, Thread: 5/16-24, Grip Length: 1.688, Fastener Length: 2.22, Drilling Type: Undrilled, Surface Treatment: Cadmium Plated Steel.

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Quantity Break Pricing

In Stock


Grip Length


Fastener Length


Drilling Type


Surface Treatment

Cadmium Plated Steel

Inventory Note

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AN5-21A Airframe Bolt

The AN5-21A Airframe Bolt has a 5/16-24 with a 5/16” shank diameter. All sizes of AN5 bolts have a 0.531 inch thread length, regardless of grip length. This thread length has been carefully calculated to accommodate a full-height nut plus one AN960-516 washer. The threaded end of the AN5-21A Airframe Bolt is tapered, to allow easier starting of the nut. The AN5-21A Airframe Bolt is tapered on the last threads, for ease of installation of the nut. The AN5-21A Airframe Bolt has a tensile strength of 125,000 psi and a shear strength of 76,000 psi. If the AN5 AN5-21A Airframe Bolt is overstressed, it will bend first rather than snapping.