Which drill bit size is most nearly equal to a hole of 0.17187 inches to be drilled?

To determine which drill bit size is most nearly equal to a hole of 0.17187 inches, it is important to convert the fractional sizes of drill bits to decimal form for easier comparison.

Starting with the fractions given, we can calculate their decimal equivalents:

• 10/64 inches is equal to 0.15625 inches.

• 11/64 inches is equal to 0.171875 inches.

• 12/64 inches is equal to 0.1875 inches.

• 13/64 inches is equal to 0.203125 inches.

When we compare these decimal values to the desired hole size of 0.17187 inches, we see that 11/64 inches (which is 0.171875 inches) is the closest match.

The precision with which 11/64 inches aligns with 0.17187 inches indicates its suitability for the task, making it the best choice for drilling a hole of that specific size. This understanding of decimal comparing in relation to the required measurement is essential for practical applications in aviation maintenance.