B-Thread Screws to JIS standards - hole sizes

 
Nom dia. B-thread hole size for steels - Length of thread engagement
0.6 0.8 1.0 1.2 1.6 2.0 2.6 3.2
2.0 1.54 1.63 1.67 1.70 1.73 1.75 1.79 -
2.3 1.85 1.93 1.96 1.98 2.02 2.04 2.09 -
2.6 2.04 2.07 2.17 2.22 2.26 2.32 2.34 2.38
3.0 2.34 2.40 2.44 2.56 2.62 2.68 2.72 2.75
3.5 2.70 2.79 2.86 2.92 3.07 3.10 3.18 3.21
4.0 3.12 3.22 3.27 3.33 3.51 3.55 3.63 3.67
5.0 - 4.07 4.17 4.21 4.38 4.48 4.58 4.63
6.0 - - 5.00 5.08 5.22 5.39 5.51 5.57
8.0 - - 6.77 6.88 7.00 7.13 7.36 7.52