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Metric Thread Size Chart. Product Table. Tap Size. Diameter (in). Diameter (mm). Thread Count (TPI) Thread Pitch (mm). Tap Drill Size. THREAD SIZE COMPARISON CHART. Dia. Size. Gauge. Dia. Size. Gauge. BRITISH. No. of Threads/Inch. BA. BSW BSF BSP. Major Dia. Inch mm. 19 Jan 2018. CATALOG 14. Inch thread sizes are specified by the nominal major diameter and the number of threads per inch. For example, a 1/4-20 (UNC coarse) thread has a 1/4" nominal These tables cover the basic sizes, limiting dimensions, tolerances, and tap-drill sizes for the American National coarse and fine thread series. CONTENTS. MARYLAND METRICS -- THREAD DATA CHART: Metric Thread -- Coarse Pitch. Nominal. Size British Standard Fine Thread Series (parallel, cylindrical). 1st. 2nd. Height. Flat size. External diameter choice choice. H (mm). A/F. (mm). A/C. (mm). 1. 0.25. 1.2. 0.25. 1.4. 0.3. 1.6. 0.35. 1.8. 0.35.ruko.de. Nominal thread size. Pitch mm. Core hole. Ø mm. M 1. 0.25. 0.75. M 1.2. 0.25. 0.95. M 1.4. 0.30. 1.10. M 1.6. 0.35. 1.25. M 1.7. 0.35. 1.30. M 1.8. The threads per inch come directly after the thread diameter Unified Thread Standard. Metric Threads. Coarse Thread (UNC). Fine Thread (UNF). Pitch.