Recreational Vehicle (RV) Technician Practice Test

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How can a technician determine the grade of a bolt?

  1. By measuring its diameter

  2. By the weight of the bolt

  3. By the marking on its head

  4. By its length

The correct answer is: By the marking on its head

A technician can determine the grade of a bolt primarily by examining the marking on its head. Bolt grades are standardized markings that indicate the material and strength of the bolt, allowing for identification of the bolt's capability to withstand various loads. These markings follow specific industry standards, such as those set by the American Society for Testing and Materials (ASTM) or the Society of Automotive Engineers (SAE), which classify bolts into different grades based on their tensile strength. While measuring the diameter of a bolt or assessing its length can provide useful information about its physical dimensions, these factors do not indicate the bolt's material properties or its grade. The weight of the bolt might give a rough idea about its size, but it is not a reliable method for determining the grade either, as different materials can have varying densities, impacting weight without altering strength. Thus, the safest and most straightforward method to ascertain the grade of a bolt is through the marking found on its head.

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