What does "TPI" stand for in firearms terminology?

In firearms terminology, "TPI" stands for "Threads Per Inch." This measurement is crucial when dealing with components that require precise fitment, such as barrel threading, mounting systems, and attachment hardware. TPI indicates the density of threads on a fastener or a threaded component, showing how many threads are present along a one-inch length. Knowing the TPI is essential for ensuring compatibility between mating parts, especially when attaching suppressors, muzzle devices, or any other threaded accessories to a firearm. A correct understanding of TPI contributes to maintaining the integrity and safety of firearm assembly and usage.