𝗢𝗰𝘁𝗮𝗻𝗲 𝗪𝗼𝗿𝗸𝗵𝗼𝗹𝗱𝗶𝗻𝗴 on Instagram: "Thread Micrometers Thread Micrometers are used to measure pitch diameter accurately. Special inserts are used, which make contact with the thread flanks only. (Picture a V. The inside edges are what flanks refer to.) A combination of major diameter and pitch diameter are used to determine a threads class of fit. Thread pitch (Distance from peak to peak is also critical among other things). Pitch Diameter: Imagine a ring that fits perfectly in th