What is the standard length of a threaded pipe?

The standard length of a threaded pipe is typically 21 feet. This measurement is commonly recognized in the plumbing and construction industries for various types of piping. Such a standard length is practical, as it allows for efficient transport and handling while accommodating various applications in residential and commercial buildings.

Using 21-foot lengths helps minimize the number of joints and potential leak points in piping systems, which can contribute to the integrity and reliability of plumbing installations. When pipes are manufactured in this length, it aligns with common practices, allowing for ease of sourcing and compatibility with typical pipe fittings.

In contrast, the other lengths provided do not represent standard manufacturing practices for threaded pipes, making them less practical for general use in construction and maintenance tasks.