Which pipe size is not commonly used in hydraulic systems?

In hydraulic systems, the choice of pipe size is crucial to ensure efficient fluid flow and to accommodate the system's operating pressures. Common sizes such as 1/2 inch, 3/4 inch, and 1 inch are frequently used because they align well with industry standards and provide the necessary flow rates for many applications.

The 5/8 inch size, however, is not a standard size used in hydraulic systems. While it may fit certain specific applications, it lacks the widespread acceptance and availability of the other sizes mentioned. This can lead to challenges in sourcing fittings, maintaining consistent pressure ratings, and ensuring compatibility with standard equipment.

In hydraulic systems, it is important to select sizes that are recognized and easily supplied to facilitate maintenance and repairs. Smaller or less common sizes like 5/8 inch can introduce complications, making 1/2 inch, 3/4 inch, and 1 inch more favorable for common hydraulic configurations.