Nominal Dia BSW BSF BSB BSP & BSPT B S Cond M.E Whitworth Form Special Fractional TPI  Drill Size in mm TPI  Drill Size in mm TPI Drill Size in mm TPI Drill Size in mm TPI Drill Size in mm TPI Drill Size in mm TPI Drill Size in mm 1/16" 60 1.20 - - - - - - - - - - - - 3/32" 48 1.90 - - - - - - - - - - - - 1.8" 40 2.55 - - 26 - 28 8.80 - - 40 2.55 - - 5/32" 32 3.20 - - - - - - - - 40 3.30 - - 3/16" 24 3.70 32 1.00 - - - - - - 40 4.00 - - 7/32" 24 4.50 28 4.60 - - - - - - 40 4.80 - - 1/4" 20 5.10 26 5.30 26 5.30 19 11.80 - - 40 5.50 24, 28, 32 5.3, 5.4, 5.5 9/32" 20 5.80 26 6.00 26 6.10 - - - - 32 6.10 24, 40 - 5/16" 18 6.50 22 6.80 26 6.80 - - - - 32 7.00 24, 40 6.75, 7.3 3/8" 16 7.90 20 8.30 26 8.40 19 15.25 - - 32 8.60 24.40 8.4, 8.9 7/16" 14 9.30 18 9.70 26 - - - - - 26 10.00 20, 24, 40 9.8, 10, 10.5 1/2" 12 10.50 16 11.10 26 11.50 14 19.00 18 11.50 26 11.50 20, 24, 40 11.5, 11.9, 12 9/16" 12 12.10 16 12.70 26 13.10 - - - - - - 20 13.1 5/8" 11 13.50 14 14.00 26 14.70 14 21.00 18 14.20 - - 20 14.5 11/16" 11 15.10 14 15.50 26 16.50 - - - - - - 20 16.2 3/4" 10 16.25 12   16.75 26 17.80 14 28.50 16 17.50 - - 14.50 17.1, 17.8 7/8" 9 19.25 11 19.75 26 21.00 14 28.25 16 20.60 - - 14, 16, 20 20.2, 20.6, 21.0 15/16" 9 20.60 11 21.50 - - - - - - - - - - 1" 8 22.00 10 22.75 26 24.20 11 30.75 16 30.10 - - - - 1.1/8" 7 24.75 9 25.75 26 27.50 - - - - - - - - 1.1/4" 7 28.00 9 28.50 26 30.70 11 30.75 16 23.80 - - 12, 20 23.0, 24..0 1.3/8" 6 30.10 8 31.50 26 33.70 - - - - - - - - 1.1/2" 6 33.50 8 34.50 26 36.90 11 45.00 14 36.10 - - - - 1.5/8" 5 35.70 8 37.70 26 40.00 - - - - - - - - 1.3/4" 5 39.00 7 41.00 26 43.50 11 51.00 - - - - - - 1.7/8" 41/2 41.30 7 43.70 26 46.50 - - - - - - - - 2" 41/2 44.50 7 47.00 26 49.60 11 57.00 14 48.50 - - - -

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