Long Nut/ Coupling Nut

The key dimensions and features shown are:

• Total Length (L) - The overall length of the nut

• Right Hand Thread - The threading on one end of the nut

• Left Hand Thread - The threading on the other end of the nut

• Thread (M) - The diameter or size of the internal threading

• S - The width across the flats of the hexagonal nut head

This type of nut is called a long nut or coupling nut. It has threaded openings on both ends, with one end having a right-hand thread and the other end having a left-hand thread.

The purpose of a long nut or coupling nut is to connect two threaded components, such as two pipes or rods, by screwing into both ends simultaneously. The left-hand and right-hand threads allow the nut to tighten and secure the connection.

These types of nuts are commonly used in plumbing, HVAC, automotive, and other industrial applications where there is a need to join two threaded parts together in a secure, aligned manner.

The specific dimensions provided, such as the total length (L), thread size (M), and width across flats (S), would allow this particular long nut or coupling nut to be properly specified and manufactured to suit the requirements of the application.