Micrometers use calibrated ratcheting screws and graduated rules to measure what kind of dimension?

• A. Angular
• B. Radial
• C. Linear
• D. Torsional

Answer: (C)

The key idea is that micrometers are built to measure a straight-line distance between two faces. The calibrated screw translates a small, precise rotation into a specific linear movement of the spindle toward the anvil, and the ratchet applies a consistent force so the measurement isn’t affected by how hard you press. The reading on the sleeve and thimble gives a linear dimension in millimeters or inches, such as thickness or outside diameter. This is different from angular measurements (which would involve an angle), radial measurements (distance from center to edge), or torsional measurements (twist about an axis).