Question 640General Subjects - Assistant Engineer

The correct answer is C) 60° thread cutting tools. A center gage is used to check the angle of 60° thread cutting tools, which are commonly used in machine shop practice. This is because the center gage has a 60° angle that can be used to verify the proper angle of the cutting tool, ensuring it is correctly ground and shaped for cutting threads. The other options are incorrect because a center gage is not typically used to check the angle of drill points (A), screw threads (B), or screw thread pitch (D), which are measured and verified using different tools and methods.