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Hex head aircraft bolts are made of
high-strength type 4037 or 8740 alloy steel (type 8740 is most commonly
used). The bolts are centerless ground and threaded after heat treatment.
Minimum tensile strength 125,000 PSI. Cadmium plated per specification
QQ-P-416A, Type II, Class 3. Available with shank drilled for cotter
pin or undrilled for stop nut application, and with or without drilled
head for safety wire. Specify bolts to have undrilled shank by adding
letter "A" after
the dash number. For bolts with drilled head add letter "H" after the
AN number. See illustrated examples. The length of AN aircraft bolts
is measured from under the head to the end of the shank. The "grip" is
the unthreaded portion of the shank. See table for conversion of length
and/or grip to proper AN callout.
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