For a hose with designation -8, which of the following is the correct inside diameter in inches?

For a hose with designation -8, which of the following is the correct inside diameter in inches?

• A. 1/4"
• B. 3/8"
• C. 5/16"
• D. 1/2"

Answer: (D)

A hose designation of -8 points to a nominal inside diameter of about 1/2 inch. In common sizing, dash numbers map to ID roughly in 1/8 inch steps: -4 is 1/4", -6 is 3/8", -8 is 1/2", -10 is 5/8", and so on. So the -8 designation is intended to indicate a bore of about 0.50 inches. The other options correspond to smaller standard sizes, and 5/16" isn’t a typical nominal ID for this dash-size system. Keep in mind actual IDs can vary slightly due to tolerance, but -8 is the standard way to denote about 1/2" ID.

A hose designation of -8 points to a nominal inside diameter of about 1/2 inch. In common sizing, dash numbers map to ID roughly in 1/8 inch steps: -4 is 1/4", -6 is 3/8", -8 is 1/2", -10 is 5/8", and so on. So the -8 designation is intended to indicate a bore of about 0.50 inches. The other options correspond to smaller standard sizes, and 5/16" isn’t a typical nominal ID for this dash-size system. Keep in mind actual IDs can vary slightly due to tolerance, but -8 is the standard way to denote about 1/2" ID.