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UNF | Size | Tapping Drill mm | Pitch mm | TPI | OD mm | | 2-64 UNF | 1.90 | 0.40 | 64 | 2.18 | | 3-56 UNF | 2.15 | 0.45 | 56 | 2.51 | | 4-48 UNF | 2.40 | 0.53 | 48 | 2.84 | | 6-40 UNF | 2.95 | 0.64 | 40 | 3.51 | | 8-36 UNF | 3.55 | 0.71 | 36 | 4.17 | | 10-32 UNF | 4.10 | 0.79 | 32 | 4.83 | | 12-28 UNF | 4.65 | 0.91 | 28 | 5.49 | | 1/4-28 UNF | 5.50 | 0.91 | 28 | 6.35 | | 5/16-24 UNF | 6.90 | 1.06 | 24 | 7.94 | | 3/8-24 UNF | 8.50 | 1.06 | 24 | 9.53 | | 7/16-20 UNF | 9.90 | 1.27 | 20 | 11.11 | | 1/2-20 UNF | 11.40 | 1.27 | 20 | 12.70 | | 9/16-18 UNF | 12.90 | 1.41 | 18 | 14.29 | | 5/8-18 UNF | 14.50 | 1.41 | 18 | 15.88 | | 3/4-16 UNF | 17.46 | 1.59 | 16 | 19.05 | | 7/8-14 UNF | 20.42 | 1.81 | 14 | 22.23 | | 1-12 UNF | 23.25 | 2.12 | 12 | 25.40 |
See also: British Association Threads, British Standard Whitworth, Thread, UNC.
  
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