What characteristic do threads per inch indicate?

Threads per inch specifically measure the number of threads that can fit within a linear inch of a threaded fastener. This characteristic is crucial for determining how closely or widely spaced the threads are, which in turn affects the engagement of the screw within a material and influences the strength and holding power of the fastener.

A higher number of threads per inch indicates that the threads are finer and more closely spaced, while a lower number suggests a coarser thread. This measurement is fundamental in applications where precise clamping and stability are required, such as in machinery and structural assemblies. Understanding this characteristic helps in selecting the appropriate fasteners for specific applications based on load requirements and ease of assembly.