A bolt with a single raised dash on the head is classified as which type?

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Multiple Choice

A bolt with a single raised dash on the head is classified as which type?

Explanation:
A single raised dash on the bolt head signals a corrosion-resistant steel bolt. In aviation hardware markings, that dash identifies the material type, indicating the bolt is designed to resist corrosion (often stainless or similar alloy). This distinguishes it from plain steel bolts or other NAS/AN variants that have different head markings. So, the one-dash head best matches a corrosion-resistant steel bolt.

A single raised dash on the bolt head signals a corrosion-resistant steel bolt. In aviation hardware markings, that dash identifies the material type, indicating the bolt is designed to resist corrosion (often stainless or similar alloy). This distinguishes it from plain steel bolts or other NAS/AN variants that have different head markings. So, the one-dash head best matches a corrosion-resistant steel bolt.

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