Can Roll Taps / CRT

    Specification Class 2 drill hole dia
Metric thread Nominal size Tap limit A B C E F Min-Max Thread overlap Ratio %
M3 x 0.5 R5 46 9 4 6 3.2 2.76 ~ 2.81 100 ~ 75
M3.5 x 0.6 R5 48 9 4 6 3.2 3.20 ~ 3.26 100 ~ 75
M4 x 0.7 R6 52 10 5 7 4 3.65 ~ 3.70 100 ~ 85
M5 x 0.8 R6 60 11 5.5 7 4 4.59 ~ 4.66 100 ~ 80
M6 x 1 R7 62 12 6 7 4.5 5.48 ~ 5.57 100 ~ 80
M8 x 1.25 R7 70 18 6.2 8 5 7.34 ~ 7.41 100 ~ 85
M10 x 1.25 R7 75 19 7 8 5.5 9.34 ~ 9.41 100 ~ 85
M10 x 1.5 R7 75 19 7 8 5.5 9.18 ~ 9.28 100 ~ 85
M12 x 1.75 R8 82 23 8.5 9 6.5 11.05 ~ 11.15 100 ~ 85
M14 x 2 R10 88 25 10.5 11 8 12.92 ~ 13.04 100 ~ 85
M16 x 2 R10 95 27 12.5 13 10 14.92 ~ 15.04 100 ~ 85
M18 x 2.5 R11 100 29 14 14 11 16.63 ~ 16.78 100 ~ 85
M20 x 2.5 R11 105 30 15 15 12 18.63 ~ 18.78 100 ~ 85
    Specification Class 2B drill hole dia
Unified thread Nominal size Tap limit A B C E F Min-Max Thread overlap Ratio %
NO. 4-40 UNC R5 46 11 4 6 3.2 2.53 ~ 2.60 100 ~ 70
NO. 5-40 UNC R5 46 9 4 6 3.2 2.86 ~ 2.93 100 ~ 70
NO. 6-32 UNC R5 48 9 4 6 3.2 3.09 ~ 3.17 100 ~ 75
NO. 8-32 UNC R6 52 10 5 7 4 3.76 ~ 3.84 700 ~ 75
NO. 10-24 UNC R6 60 11 5.5 7 4.5 4.26 ~ 4.35 100 ~ 80
NO. 12-24 UNC R6 60 11 5.5 7 4.5 4.92 ~ 5.01 100 ~ 80
1/4-20 UNC R7 62 14 6 7 4.5 5.67 ~ 5.78 100 ~ 80
5/16-18 UNC R7 70 18 6.1 8 5 7.18 ~ 7.29 100 ~ 80
3/8-16 UNC R7 75 21 7 8 5.5 8.66 ~ 8.78 100 ~ 80
7/16-14 UNC R7 80 23 8 9 6 10.11 ~ 10.25 100 ~ 80
1/2-13 UNC R8 85 25 9 10 7 11.62~11.78 100 ~80
5/8-11 UNC R11 95 27 12 12 9 14.62 ~ 14.76 100 ~85
3/4-10 UNC R12 105 30 14 14 11 17.67 ~ 17.88 100 ~80