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Marks on the head of a bolt indicate what information?

  1. Type of material used

  2. Grade and tensile strength

  3. Manufacturer's logo

  4. Size of the bolt

The correct answer is: Grade and tensile strength

Marks on the head of a bolt typically provide information regarding its grade and tensile strength. The grade indicates the strength of the bolt and is defined by its physical properties and the material from which it is made. Bolt grading is essential in ensuring that the fastener can handle the forces and loads it will encounter in its application. Tensile strength, which is the maximum amount of tensile stress that a material can withstand before failure, is often represented through these markings. Understanding the markings allows users to select the appropriate bolt for specific applications, ensuring safety and performance. While manufacturer's logos, bolt sizes, and materials can sometimes be found on bolts, they are not universally indicated by head markings as grade and tensile strength are. This focus on grade and strength is crucial for maintaining structural integrity in engineering and construction projects.