ISO Metric Coarse Size (mm) Pitch (mm) Drill (mm) M1 .25 .75 M1.1 .25 .85 M1.2 .25 .95 M1.4 .3 1.1 M1.6 .35 1.25 M1.8 .35 1.45 M2 .4 1.6 M2.2 .45 1.75 M2.5 .45 2.05 M3 .5 2.5 M3.5 .6 2.9 M4 .7 3.3 M4.5 .75 3.75 M5 .8 4.2 M6 1 5 M7 1 6 M8 1.25 6.75 M9 1.25 7.75 M10 1.5 8.5 M11 1.5 9.5 M12 1.75 10.2 M14 2 12 M16 2 14 M18 2.5 15.5 M20 2.5 17.5 M22 2.5 19.5 M24 3 21 M27 3 24 M30 3.5 26.5 M33 3.5 29.5 M36 4 32 M39 4 35 M42 4.5 37.5 M45 4.5 40.5 M48 5 43 M52 5 47 M56 5.5 50.5 M60 5.5 54.5 M64 6 58 M68 6 62 M72 6 66 M76 6 70 UNC Size No. or inch Pitch TPI Drill (mm) #1 64 1.55 #2 56 1.85 #3 48 2.1 #4 40 2.35 #5 40 2.65 #6 32 2.85 #8 32 3.5 #10 24 3.9 #12 24 4.5 1/4 20 5.1 5/16 18 6.6 3/8 16 8 7/16 14 9.4 1/2 13 10.8 9/16 12 12.2 5/8 11 13.5 3/4 10 16.5 7/8 9 19.5 1 8 22.25 1 1/8 7 25 1 1/4 7 28 1 3/8 6 30.75 1 1/2 6 34 1 3/4 5 39.5 2 4.5 45 2 1/4 4.5 51.5 2 1/2 4 57.25 2 3/4 4 63.5 3 4 70 UNF Size No. or inch Pitch TPI Drill (mm) #0 80 1.25 #1 72 1.55 #2 64 1.9 #3 56 2.15 #4 48 2.4 #5 44 2.7 #6 40 2.95 #8 36 3.5 #10 32 4.1 #12 28 4.7 1/4 28 5.5 5/16 24 6.9 3/8 24 8.5 7/16 20 9.9 1/2 20 11.5 9/16 18 12.9 5/8 18 14.5 3/4 16 17.5 7/8 14 20.4 1 12 23.25 1 1/8 12 26.5 1 1/4 12 29.5 1 3/8 12 32.75 1 1/2 12 36

ISO Metric Fine Size (mm) Pitch (mm) Drill (mm) M2 .25 1.75 M2.2 .25 1.95 M2.3 .25 2.05 M2.5 .35 2.15 M2.6 .35 2.25 M3 .35 2.65 M3.5 .35 3.15 M4 .35 3.65 M4 .5 3.5 M5 .35 4.65 M5 .5 4.5 M5 .75 4.25 M5.5 .5 5 M6 .5 5.5 M6 .75 5.25 M7 .75 6.25 M8 .5 7.5 M8 .75 7.25 M8 1 7 M9 .75 8.25 M9 1 8 M10 .5 9.5 M10 .75 9.25 M10 1 9 M10 1.25 8.75 M11 .75 10.25 M11 1 10 M11 1.25 9.75 M12 .5 11.5 M12 .75 11.25 M12 1 11 M12 1.25 10.75 M12 1.5 10.5 M14 1 13 M14 1.25 12.75 M14 1.5 12.5 M15 .75 14.25 M15 1 14 M15 1.5 13.5 M16 .5 15.5 M16 .75 15.25 M16 1 15 M16 1.25 14.75 M16 1.5 14.5 M17 1 16 M17 1.5 15.5 M18 .75 17.25 M18 1 17 M18 1.25 16.75 M18 1.5 16.5 M18 2 16 M19 1 18 M20 1 19 M20 1.5 18.5 M20 2 18 M22 1 21 M22 1.5 20.5 M22 2 20 M24 1 23 M24 1.5 22.5 M24 2 22 M25 1 24 M25 1.5 23.5 M25 2 23 M27 1 26 M27 1.5 25.5 M27 2 25 M28 1 27 M28 1.5 26.5 M28 2 26 M30 1 29 M30 1.5 28.5 M30 2 28 M30 3 27 M32 1 31 M32 1.5 30.5 M32 2 30 M33 1.5 31.5 M33 2 31 M33 3 30 M35 1.5 33.5 M35 2 33 M35 3 32 M36 1 35 M36 1.5 34.4 M36 2 34 M36 3 33 M38 1 37 M38 1.5 36.5 M38 2 36 M39 1.5 37.5 M39 2 37 M39 3 36 M40 1 39 M40 1.5 38.5 M40 3 37 M42 1.5 40.5 M42 2 40 M42 3 39 M42 4 38 M45 1.5 43.5 M45 2 43 M45 3 42 M48 1.5 46.5 M48 2 46 M48 3 45 M48 4 44 M50 1.5 48.5 M50 2 48 M50 3 47 M52 1.5 50.5 M52 2 50 M52 3 49 M52 4 48 M56 2 54 M56 4 52