Which of the following bolts has a triangle with an 'X' inside, on the head of the bolt?

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Multiple Choice

Which of the following bolts has a triangle with an 'X' inside, on the head of the bolt?

Explanation:
The key idea here is how bolt head markings identify the bolt’s specification and tolerance class. The triangle with an X inside on the bolt head is the symbol used for NAS close-tolerance bolts. This marking tells you the bolt is produced to tighter dimensional tolerances than standard bolts, which is important for assemblies that require precise alignment and predictable preload. So, when you see that triangle-with-X symbol, you know you’re dealing with a NAS close-tolerance bolt and should use it in places where tight fit and accuracy matter. Other standards—AN, MS, or SAE bolts—have their own distinct head markings and do not carry this triangle-with-X symbol.

The key idea here is how bolt head markings identify the bolt’s specification and tolerance class. The triangle with an X inside on the bolt head is the symbol used for NAS close-tolerance bolts. This marking tells you the bolt is produced to tighter dimensional tolerances than standard bolts, which is important for assemblies that require precise alignment and predictable preload.

So, when you see that triangle-with-X symbol, you know you’re dealing with a NAS close-tolerance bolt and should use it in places where tight fit and accuracy matter. Other standards—AN, MS, or SAE bolts—have their own distinct head markings and do not carry this triangle-with-X symbol.

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