Which head marking identifies a standard steel bolt?

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Multiple Choice

Which head marking identifies a standard steel bolt?

Explanation:
Head markings on bolts are used to identify the material and grade. For standard steel bolts, there isn’t a special identifying mark on the head—the mark is essentially the absence of a mark. That plain head distinguishes it from other types that carry specific markings to indicate alloy steel, stainless steel, or other treatments. So identifying a standard steel bolt by its head is recognizing that there is no additional marking on the head.

Head markings on bolts are used to identify the material and grade. For standard steel bolts, there isn’t a special identifying mark on the head—the mark is essentially the absence of a mark. That plain head distinguishes it from other types that carry specific markings to indicate alloy steel, stainless steel, or other treatments. So identifying a standard steel bolt by its head is recognizing that there is no additional marking on the head.

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