The specification 6-32 for a machine screw refers to the diameter and what other characteristic?

The specification 6-32 for a machine screw indicates two main characteristics: the nominal diameter and the threads per inch (TPI). In this case, "6" refers to a screw diameter of approximately 0.1380 inches, while "32" refers to the number of threads present per inch along the screw's length.

Understanding the threading is crucial, as it affects how tightly a screw can fit into a corresponding hole and how it will perform under load. A higher number of threads per inch indicates finer threading, which can provide better holding strength and greater precision for adjustments. Knowing the TPI is essential when selecting screws for specific applications, ensuring compatibility with nuts, tapped holes, and other fasteners.

The other characteristics mentioned, such as length in inches, material type, and head type, are important for specific applications but they do not define the fundamental specification denoted by the 6-32 designation. Hence, the threads per inch is the defining characteristic in this context alongside the diameter.