In hose designations, which value is used to indicate the inside diameter?

In hose designations, which value is used to indicate the inside diameter?

• A. Outside diameter
• B. Wall thickness
• C. Inside diameter
• D. Jacket diameter

Answer: (C)

In hose sizing, the size is defined by the bore through which the fluid flows. That bore is the inside diameter, so the designation uses the inside diameter to indicate the hose size. This matters because the flow area—and thus the capacity to carry fluid and fit with correct fittings—depends on the bore, not the outer shell. The outside diameter is simply the hose’s exterior and affects routing and clearance. Wall thickness is derived from the outer and inner diameters and relates to strength and pressure rating, not the size label. Jacket diameter applies to hoses with a protective outer layer and isn’t used to denote the bore. So the value used to indicate the inside diameter is the inside diameter itself.

In hose sizing, the size is defined by the bore through which the fluid flows. That bore is the inside diameter, so the designation uses the inside diameter to indicate the hose size. This matters because the flow area—and thus the capacity to carry fluid and fit with correct fittings—depends on the bore, not the outer shell. The outside diameter is simply the hose’s exterior and affects routing and clearance. Wall thickness is derived from the outer and inner diameters and relates to strength and pressure rating, not the size label. Jacket diameter applies to hoses with a protective outer layer and isn’t used to denote the bore. So the value used to indicate the inside diameter is the inside diameter itself.