A fastener with three radial marks on the head is an:

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Multiple Choice

A fastener with three radial marks on the head is an:

Three radial marks on a fastener head encode its strength grade. In the Imperial system, the number of radial lines indicates the bolt’s grade, with three lines designating Grade 5 as a middle-strength option. This head-marking pattern is not used for metric fasteners (which use marks like 8.8 or 10.9) and typically Grade 2 in Imperial would have fewer or no markings. So these three radial marks point to Imperial Grade 5, making it the best description for the fastener.

Three radial marks on a fastener head encode its strength grade. In the Imperial system, the number of radial lines indicates the bolt’s grade, with three lines designating Grade 5 as a middle-strength option. This head-marking pattern is not used for metric fasteners (which use marks like 8.8 or 10.9) and typically Grade 2 in Imperial would have fewer or no markings. So these three radial marks point to Imperial Grade 5, making it the best description for the fastener.

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