What is the Minimum Tensile Strength for a bolt with 3 radial lines?

The minimum tensile strength for a bolt is determined by its grade and specifications, which is often indicated by the number of radial lines present on the head of the bolt. In this case, a bolt with three radial lines corresponds to a particular standard that specifies its mechanical properties, including tensile strength.

For bolts, the tensile strength is typically associated with various grading systems. The presence of three radial lines generally indicates that the bolt is a medium-strength grade, such as Grade 5 in the Unified Specification. This bolt grade usually has a minimum tensile strength of around 105,000 psi. Therefore, the correct choice of 105K reflects the typical minimum tensile strength expected for a bolt marked with three radial lines, aligning with the identification of its grade and its structural application.

Other options reflect higher tensile strength values that would correspond to higher-grade bolts, typically more suited for applications requiring greater strength and load-bearing capacities. Thus, the value of 105K for the bolt with three radial lines accurately reflects its designed function and strength criteria needed for safe and efficient use in mechanical applications.