Which symbol on a bolt head indicates a NAS close tolerance bolt?

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Multiple Choice

Which symbol on a bolt head indicates a NAS close tolerance bolt?

Explanation:
The symbol is an X inside a small triangle. NAS close-tolerance bolts carry this head mark to show they meet tighter dimensional tolerances required for precise aerospace assemblies. The other symbols—such as a cross, a single raised dash, or an asterisk—are used for different bolt classifications and do not indicate NAS close tolerance. So, the X-in-a-triangle marking is the identifying indicator for NAS close-tolerance bolts.

The symbol is an X inside a small triangle. NAS close-tolerance bolts carry this head mark to show they meet tighter dimensional tolerances required for precise aerospace assemblies. The other symbols—such as a cross, a single raised dash, or an asterisk—are used for different bolt classifications and do not indicate NAS close tolerance. So, the X-in-a-triangle marking is the identifying indicator for NAS close-tolerance bolts.

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