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AN Bolt Identification Gauge, AN3 to AN10

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With length increments of only 1/8 inch and dash numbers that do not translate directly to bolt length, AN bolts can be confusing and hard to identify. This handy AN bolt gauge makes it easy to determine exactly what bolt you have in your hand. Simply place the bolt in the appropriate slot. The end of the bolt will point to the correct dash number. Head marking guide and full nomenclature instructions are printed on the back side.

This sturdy steel gauge is designed for AN3 through AN10 bolt sizes up to -50 length (over 5" long). Layback design lets you rest it on your workbench and lay the bolts on it rather than using both hands. Compact size (5.5" x 6.2") fits easily in your toolbox.

Part No.
Stock Status

Condition: New

In Stock

Great product Just what I needed


Very easy to use and great quality






This makes it easy to measure removed bolts to easily pick out the new ones


Columbia, PA


Really handy for most of us


I have a couple friends who can reliably identify AN hardware by looking at it. They're both aircraft mechanics, and use AN hardware all the time. If you're one of these, you don't need this thing, but for the rest of us who use AN hardware once in a while, this is a very handy tool. It's well made, so will last a long time, and allows very quick and reliable identification of hardware so you can order just what you need. Great addition to the tool box.




AN Bolt Identification Gauge, AN3 to AN10

5.0 3