Which statement best describes the standard micrometer division?

Which statement best describes the standard micrometer division?

• A. It Divides The Inch Into 1000 Parts
• B. It Divides The Inch Into 100 Parts
• C. It Divides The Inch Into 10 Parts
• D. It Divides The Inch Into 500 Parts

Answer: (A)

A micrometer is built to give measurements in thousandths of an inch. The screw pitch is 40 threads per inch, so one full turn moves the spindle 1/40 inch (0.025"). The thimble is typically divided into 25 equal parts. Each thimble division then equals 0.025" ÷ 25 = 0.001" (one thousandth of an inch). With the sleeve providing the main inch reading and the thimble adding the thousandths, the instrument effectively divides the inch into 1000 equal parts. That’s why it’s described as having divisions of 0.001 inch.

A micrometer is built to give measurements in thousandths of an inch. The screw pitch is 40 threads per inch, so one full turn moves the spindle 1/40 inch (0.025"). The thimble is typically divided into 25 equal parts. Each thimble division then equals 0.025" ÷ 25 = 0.001" (one thousandth of an inch). With the sleeve providing the main inch reading and the thimble adding the thousandths, the instrument effectively divides the inch into 1000 equal parts. That’s why it’s described as having divisions of 0.001 inch.