Identify the bolt type that features a triangle with an X stamped on its head in standard aerospace fastener markings.

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Multiple Choice

Identify the bolt type that features a triangle with an X stamped on its head in standard aerospace fastener markings.

Explanation:
The symbol of a triangle with an X on the bolt head identifies NAS close tolerance bolts. This marking is used to distinguish NAS close tolerance fasteners from other families, signaling that the bolt meets tighter dimensional tolerances on the shank and threads for precise fit and consistent preload in critical assemblies. Other bolt families use different head markings (such as AN, MS, or SAE identifiers), but none use the triangle-with-X symbol. So the bolt with that marking is the NAS close tolerance type.

The symbol of a triangle with an X on the bolt head identifies NAS close tolerance bolts. This marking is used to distinguish NAS close tolerance fasteners from other families, signaling that the bolt meets tighter dimensional tolerances on the shank and threads for precise fit and consistent preload in critical assemblies. Other bolt families use different head markings (such as AN, MS, or SAE identifiers), but none use the triangle-with-X symbol. So the bolt with that marking is the NAS close tolerance type.

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