What is the minimum tensile strength (lbf/in2) of a specific bolt?

The minimum tensile strength of a bolt is a critical property that refers to the maximum amount of tensile (pulling or stretching) stress that the bolt can withstand before failure occurs. In this context, the correct answer, which is listed as 105K (or 105,000 lbf/in²), indicates a high-strength bolt designed for demanding applications where significant load-bearing capacity is necessary.

When evaluating the options, it's important to consider that the tensile strength value is typically measured in pounds per square inch (lbf/in²), and in many engineering applications, high-strength bolts are often used in structural and mechanical designs where safety and durability are paramount. A tensile strength of 105K aligns with specifications for alloy steel bolts that are heat-treated or otherwise engineered for high-load scenarios.

The other options present tensile strengths that are significantly lower than 105K. While they may be suitable for lighter or less critical applications, they do not meet the requirements for high-strength applications. Thus, understanding the context of tensile strength helps to clarify why the specific value of 105K is considered the standard for certain high-performance bolts.