Identifying AN Bolt s: Sizes and Nomenclature. Under vibration or movement, the threads can damage the hole. Thread Length is constant for each bolt diameter. It is calculated to be enough for one AN960 flat washer under the head, a full-height AN365 or AN310 nut, and one AN960 flat washer under the nut. Grip lengths are in 1/8 increments. AN BOLT SELECTOR Hex head aircraft bolt s are made of high-strength type 4037 or 8740 alloy steel (type 8740 heremonly used). The bolt s are centerless ground and threaded after heat treatment. Minimum tensile strength 125,000 PSI. Bolt grip details. The diameter is denoted by the number following AN. Thus AN3 means a bolt with 3/16 inch diameter. The number following the dash indicates the length in eighths (1/8) of an inch up to 7/8. If a bolt is longer than an inch the first digit is the number of inches and the second digit is the number of eighths.

Articles on light aircraft construction by Ron Alexander, brought to you by herepany AN BOLT GAUGE Automatically sizes all AN bolt s up to 5/8” diameter and 5 inches long. P/N 04-05400... POCKET BOLT GAUGE This new aluminum gauge measures just 3-3/4” x 5-7/8” to fit eas i ly in a shirt pocket. De ter mines exact part num bers for AN 3 thru AN 8 di am e ter bolts thru 5” in length. AN bolt s Decoded. This .PDF file will give you AN bolt sizes , by Part Number. The first digit after the AN letters in the Part Number will be the bolt diameter, in 1/16ths of an inch. The AN-3 bolt s are 3/16 (~5mm) in diameter. AN-4 bolt s are 4/16 or 1/4 (~6,4mm) …

Thread length and grip. The threaded length of AN bolt s is about 3/8 for AN3, 7/16 for AN4, 1/2 for AN5 and 9/16 for AN6–AN8. The grip is the shank length minus the threaded length, which for the AN6- H7A bolt would be 7/8 shank length minus 9/16 thread length = 5 grip. With metric threads tapping drill size is easy to work out because it is the bolt diameter minus the thread pitch so, for example, a standard pitch M16 bolt has a pitch of 2.0mm so the tapping drill size is 16 - … 18 rows US Bolt Head/Wrench Size . Print this page . Bolt Diameter Head and Wrench Size ; Hex …

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