When measuring hose, what is the primary dimension used?

The primary dimension used when measuring hose is the inside diameter (ID). This measurement is crucial because it directly affects the flow of fluid through the hose. The ID determines how much fluid can pass through at a given time, which is especially important in applications like fuel systems, coolant systems, and hydraulic lines where precise flow rates are necessary for proper operation.

Knowing the ID also helps in selecting the appropriate fittings and ensuring compatibility with other components in the system. While other dimensions like outside diameter (OD) and length may be important in certain contexts or for specific applications, the ID is the most critical for understanding the hose's capacity and its performance in a system. Material properties are also relevant but do not constitute a dimension that affects the hose's functionality in the same direct manner.