The grade of a bolt can be determined by

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Multiple Choice

The grade of a bolt can be determined by

Explanation:
The grade is a strength rating defined by standardized markings on the bolt head. Those marks encode the bolt’s strength class (tensile and yield properties), so the head marking is the direct indicator of grade. Length only tells you the size and fit, not the strength. Color often shows coating or identification, not the mechanical grade. Material matters for what grades can exist, but the grade itself is determined by the head marking, which is why that option is the best choice.

The grade is a strength rating defined by standardized markings on the bolt head. Those marks encode the bolt’s strength class (tensile and yield properties), so the head marking is the direct indicator of grade. Length only tells you the size and fit, not the strength. Color often shows coating or identification, not the mechanical grade. Material matters for what grades can exist, but the grade itself is determined by the head marking, which is why that option is the best choice.

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