What is the primary measurement for metal tubing fluid lines?

The primary measurement for metal tubing fluid lines is indeed the outside diameter in 1/16 inch increments. This measurement is crucial because it allows for the proper selection of tubing that will fit into standard fittings and ensure compatibility within fluid systems. The outside diameter provides a unified standard that ensures uniformity and effective sealing capabilities when connecting to other components.

In aircraft and machinery, using the correct outside diameter is essential for maintaining fluid integrity under pressure and preventing leaks. Therefore, specifications are often defined in increments like 1/16 inches to achieve precise installations. This standardization helps ensure that various parts manufactured by different suppliers can interconnect and perform reliably within a system.

While wall thickness and inside diameter are important for understanding the strength and capacity of the tubing, they are secondary to the outside diameter when determining how tubing will interface with fittings and connectors. Length may also be a necessary measurement for installation but does not impact the compatibility of the tubing.