Hand Tap (Straight Fluted Taps)

  Tap Limit Specification  
Metric thread Nominal size HT A B C E F Class 2 drill hole dia
M3 x 0.5 H2, H3 46 11 4 6 3.2 2.6
M4 x 0.7 H2, H3 52 13 5 7 4 3.4
M5 x 0.8 H2, H3 60 16 5.5 7 4.5 4.3
M6 x 1 H2, H3 62 19 6 7 4.5 5.1
M8 x 1.25 H3, H4 70 22 6.2 8 5 6.8
M10 x 1.5 H3, H4 75 24 7 8 5.5 8.6
M12 x 1.75 H3, H4 82 29 8.5 9 6.5 10.4
M14 x 2 H4 88 30 10.5 11 8 12.2
M16 x 2 H4 95 32 12.5 13 10 14.2
M18 x 2.5 H4 100 37 14 14 11 15.7
M20 x 2.5 H4 105 37 15 15 12 17.7
M22 x 2.5 H4 115 38 17 16 13 19.7
M24 x 3 H4 120 45 19 18 15 21.2
    Specification  
Unified thread Nominal size Tap limit A B C E F Class 2B drill hole dia
NO.5-40 UNC H2, H3 46 11 4 6 3.2 2.7
NO.6-32 UNC H2, H3 48 13 4 6 3.2 2.9
NO.8-32 UNC H2, H3 52 13 5 7 4 3.5
NO.10-24 UNC H2, H3 60 16 5.5 7 4.5 3.9
NO.12-24 H2, H3 60 16 5.5 7 4.5 4.6
1/4-20 UNC H2, H3 62 19 6 7 4.5 5.3
5/16-18 UNC H2, H3 70 22 6.1 8 5 6.7
3/8-16 UNC H2, H3 75 24 7 8 5.5 8.2
7/16-14 UNC H3, H4 80 25 8 9 6 9.5
1/2-13 UNC H4 85 29 9 10 7 11.0
9/16-12 UNC H4 90 30 10.5 11 8 11.0
5/8-11 UNC H4 95 32 12 12 9 13.8
3/4-10 UNC H4 105 37 14 14 11 16.8
7/8-9 UNC H4 115 38 17 16 13 19.6
1-8 UNC H4 125 45 20 18 15 22.5