Thread Wire Measurement Calculator
Thread wire measurement finds pitch diameter from a micrometer reading over three wires, the wire diameter and the thread pitch.
thread wire measurement calculator three wire thread measurement calculator thread measurement over wires calculator
Pitch diameter by wires
E = M - 3 * W + 0.86603 * P
Best wire size
W_best = 0.57735 * P
Use case
Use this for 60 degree Unified and ISO metric threads. Gauge-grade work may need lead-angle, angle-error and measuring-force corrections.
Related pages
- Thread pitch diameter calculator - three-wire method and best wire size.
- Tap drill size calculator - tap drill and thread engagement checks.
- Thread engagement calculator - minimum engagement and stripping screen.
- Thread engagement guide - joint context for internal and external threads.