Used for a positive identification of the type and pitch (windings) of threads used on bolts or nuts. US (UTS or Unified Threads Standard) are most used in the USA and Canada. Threads come in 2 types UNF ‘Fine’ or UNC ‘Coarse’. UNF is most used in steel, UNC is most used in aluminum. – Threads: UNC (US coarse threads) – Degree: 60 degrees – Number of blades: 22 – Pitch: 4, 4.5, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 16, 18, 20, 22, 24, 32, 40, 48, 56, 64
