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Tap Size Drilling Chart

Below is the tap size drilling chart for your check and reference! if you have any other questions, welcome to contact us!

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Tap size

Metric Coarse Thread

Specification Standard Diameter Maximum Minimum Specification Standard Diameter Maximum Minimum
M1.0*0.25 0.75 0.785 0.729 M5*0.8 4.2 4.334 4.134
M1.1*0.25 0.85 0.885 0.829 M5*0.9 4.1 4.17 3.98
M1.2*0.25 0.95 0.985 0.929 M6*1.0 5 5.153 4.917
M1.4*0.3 1.1 1.142 1.075 M7*1.0 6 6.153 5.917
M1.6*0.35 1.25 1.321 1.221 M8*1.25 6.8 6.912 6.647
M1.7*0.35 1.35 1.421 1.321 M9*1.25 7.8 7.912 7.647
M1.8*0.35 1.45 1.521 1.421 M10*1.5 8.5 8.676 8.376
M2.0*0.4 1.6 1.679 1.567 M11*1.5 9.5 9.676 9.376
M2.2*0.45 1.75 1.888 1.713 M12*1.75 10.3 10.24 10.106
M2.3*0.4 1.9 1.979 1.867 M14*2.0 12 12.21 11.835
M2.5*0.45 2.1 2.138 2.013 M16*2.0 14 14.21 13.835
M2.6*0.45 2.2 2.238 2.113 M18*2.5 15 15.144 15.294
M3.0*0.5 2.5 2.599 2.459 M20*2.5 17 17.744 17.294
M3.0*0.6 2.4 2.44 2.28 M22*2.5 19 19.744 19.294
M3.5*0.6 2.9 3.01 2.85 M24*3.0 21 21.252 20.752
M4.0*0.7 3.8 3.422 3.242 M27*3.0 24 24.252 23.752
M4.0*0.75 3.25 3.326 3.106 M30*3.5 26.5 26.771 26.211
M4.5*0.7 3.8 3.878 3.688

Metric Fine Thread

Specification Standard Diameter Maximum Minimum Specification Standard Diameter Maximum Minimum
M1.0*0.2 0.8 0.821 0.783 M15*1.0 14 14.353 13.917
M1.1*0.2 0.9 0.921 0.883 M16*1.5 14.5 14.676 14.376
M1.2*0.2 1 1.021 0.983 M16*1.0 15 15.153 14.917
M1.4*0.2 1.2 1.221 1.183 M17*1.5 15.5 15.676 15.376
M1.6*0.2 1.4 1.421 1.383 M17*1.0 16 16.153 15.917
M1.7*0.2 1.45 1.5 1.46 M18*2.0 16 16.21 15.835
M1.8*0.2 1.6 1.621 1.583 M18*1.5 16.5 16.676 16.376
M2.0*0.25 1.75 1.785 1.729 M18*1.0 17 17.153 16.917
M2.2*0.25 1.95 1.985 1.929 M20*2.0 18 18.21 17.835
M2.3*0.25 2.05 2.061 2.001 M20*1.5 18.5 18.676 18.376
M2.5*0.35 2.2 2.221 2.121 M20*1.0 19 19.153 18.917
M2.5*0.35 2.2 2.246 2.186 M22*2.0 20 20.21 19.835
M3.0*0.35 2.7 2.721 2.621 M22*1.5 20.5 20.676 20.376
M3.5*0.35 3.2 3.221 3.121 22*1.0 21 21.153 20.917
M4.0*0.5 3.5 3.599 3.459 M24*2.0 22 22.21 21.835
M4.5*0.5 4 4.099 3.959 M24*1.5 22.5 22.676 22.376
M5.0*0.5 4.5 4.599 4.459 M24*1.0 23 23.153 22.917
M5.5*0.5 5 5.099 4.959 M25*2.0 23 23.21 22.835
M6.0*0.75 5.3 5.378 5.188 M25*1.5 23.5 23.676 23.376
M6.0*0.5 5.5 5.55 5.4 M25*1.0 24 24.153 23.917
M7.0*0.75 6.3 6.378 6.188 M26*1.5 24.5 24.676 24.876
M7.0*0.5 6.5 6.55 6.4 M27*2.0 25 25.21 24.735
M8.0*1 7 7.153 6.917 M27*1.5 25.5 25.676 25.376
M8.0*0.75 7.3 7.378 7.188 M27*1.0 26 26.153 25.735
M8.0*0.5 7.5 7.52 7.4 M28*2.0 26 26.21 25.835
M9.0*1 8 8.153 7.917 M28*1.5 26 26.676 26.376
M9.0*0.75 8.3 8.378 8.188 M28*1.0 27 27.153 26.917
M10*1.25 8.8 8.912 8.647 M30*3.0 27 27.252 26.752
M10*1.0 9 9.153 8.917 M30*2.0 28 28.21 27.835
M10*0.75 9.3 9.378 9.188 M30*1.0 28 28.676 28.376
M10*0.5 9.5 9.52 9.4 M32*2.0 30 29.153 28.917
M11*1.0 10 10.153 9.917 M32*1.5 30 30.21 29.835
M11*0.75 10.3 10.378 10.188 M33*3.0 30 30.676 30.376
M12*1.5 10.5 10.676 10.376 M33*2.0 31 30.252 29.752
M12*1.25 10.8 10.912 10.647 M33*1.5 31.5 31.21 30.835
M12*1 11 11.153 10.917 M35*1.5 33.5 33.676 31.376
M12*0.5 11.5 11.523 11.4 M36*3.0 33 33.252 32.752
M14*0.5 12.5 12.676 12.376 M36*2.0 34 34.21 33.835
M14*1.0 13 13.153 12.917 M36*1.5 34 34.676 34.376
M15*1.50 13.5 13.676 13.376

American Standard Coarse Thread

Specifications UNC Outer Diameter           Grade 2 Drill Aperture Specifications UNC outer diameter           Grade 2 Drill Aperture
Standard Diameter Maximum Minimum Standard  Diameter Maximum Minmum
NO.1－64（1.854) 1.55 1.582 1.452 1\2-13 10.8 11.023 10.592
NO.2-56(2.184) 1.8 1.871 1.695 9\16-12 12.2 12.446 11.989
NO.3-48(2.515) 2.1 2.146 1.941 5\8-11 13.6 12.868 13.386
NO.4-40(2.845) 2.3 2.385 2.157 3\4-10 16.5 18.84 16.307
NO.5-40(3.173) 2.6 2.679 2.487 7\8-9 19.5 19.761 19.507
NO.6-32(3.505) 2.8 2.895 2.642 1\8-8 22.2 22.606 21.971
NO.8-32(4.166) 3.4 3.53 3.302 1-1\8-7 25 25.349 24.6398
NO.10-24(4.826) 3.9 3.962 3.683 1-1\4-7 28.2 28.524 27.813
NO.12-24(5.486) 4.5 4.597 4.344 1-3\8-6 30.8 31.115 30.353
1\4-20 5.1 5.257 4.979 1-1\2-6 34 34.29 33.528
5\16-18 6.6 6.731 6.401 1-3\4-5 39.5 39.827 38.964
3\8-16 8 8.153 7.793 1-4-1\2 45.2 45.593 44.679
7\16-14 9.4 9.55 9.144

British Standard Pipe Parallel

Specification Standard Diameter Drilling Diameter
Maximum Minimum
PS1\16-28 6.5 6.632 6.49
PS1\8-28 8.5 8.687 8.495
Ps1\4-19 11.4 11.549 11.341
PS3\8-19 15 15.054 14.846
PS1\2-14 18.5 18.733 18.489
PS3\4-14 24 24.259 23.975
PS1\4-11 30.2 30.471 30.111
PS1-1\4-11 38.8 39.132 38.772
PS1-1\2-11 44.8 45.025 44.665
PS2-1\2-11 56.5 56.836 56.476
Specification Standard Diameter Effective Tooth Length Standard Length
Using Reamer Not Using Reamer Medium Thread Inner Diameter Thread Inner Diameter
PT1\16-28 6.1 6.2 6.244 6.384
PT1\8-28 8.1 8 8.249 8.388
PT1\4-19 10.7 11 10.962 11.174
PT3\8-19 14.2 14.5 14.448 14.685
PT1\2-14 17.6 13 17.979 18.263
PT3\4-14 23 23.5 23.378 23.663
PT1\4-11 29 29.5 29.459 29.822
PT1-1\4-11 37.5 38 37.976 38.339
PT1-1\2-11 43.4 44 43.869 44.232
PT2-2-11 54.9 55.5 55.412 55.844

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