Intro to Millwright Practice Exam

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What is the most common thread angle used in threading?

45 Degrees
60 Degrees
75 Degrees
90 Degrees

The correct answer is: 60 Degrees

The most common thread angle used in threading is 60 degrees. This angle is primarily associated with the Unified Thread Standard (UTS) and the American National Thread Standard (AN), which are widely used for fastening components in various applications, particularly in the United States. The 60-degree angle offers a nice balance of strength and ease of manufacturing, making it well-suited for both metric and imperial threading systems. The shape created by this thread angle contributes to its strength in tensile applications, allowing the threads to engage properly while minimizing the risk of stripping or failing under load. This angle also ensures a good fit between male and female threads, promoting efficient assembly and disassembly of mechanical components.