15. Bored hole size before tapping ( for thread cutting )
■for



Description of products
forMetric
MetricThreads
Threads Unit
Unit: :mm
mm
Minor
Minordiameter
diameterofofinternal threads
internal threads(D1)
(D1) Bored
Boredhole
holesize
size Minor
Minordiameter
diameterofofinternal threads
internal threads(D1)
(D1) Bored
Boredhole
holesize
size
Size
Size Size
Size
Max. Min. ( (ref.)
ref.) Max. Min. ( (ref.)
ref.)
M1 ×0.25 (0.785) (0.729) 0.77
0.77 M 9 ×1.25 7.912 7.647 7.85
6.33
M1 ×0.2 (0.821) (0.783) 0.81 M 9 ×1 8.153 7.917 8.09
0.81 6.56
M1.1×0.25 (0.885) (0.829) 0.87 M 9 ×0.75 8.378 8.188 8.33
M1.1×0.2 (0.921) (0.883) 0.87
0.91 ※1 M 9 ×0.5 8.599 8.459 6.85
8.56
M1.2×0.25 (0.985) (0.929) 0.97
0.91 ※2 M 9.5×1 8.653 8.417 8.59
7.09
M1.2×0.2 (1.021) (0.983) 1.01 ※2 M 9.5×0.75 8.878 8.688 8.83
0.97 7.33
M1.4×0.3 (1.142) (1.075) 1.13 ※2 M 9.5×0.5 9.099 8.959 9.06
M1.4×0.2 (1.221) (1.183) 1.01
1.21 M10 ×1.5 8.676 8.376 7.56
8.60
M1.6×0.35 1.321 1.221 1.30
1.13 M10 ×1.25 8.912 8.647 8.85
7.85
M1.6×0.2 (1.421) (1.383) 1.41 M10 ×1 9.153 8.917 9.09
1.21 8.09
※1 M1.7×0.35 1.421 1.321 1.40 M10 ×0.75 9.378 9.188 9.33
1.30 8.33
※1 M1.7×0.2 1.521 1.483 1.51 ※1 M10 ×0.5 9.599 9.459 9.56
M1.8×0.35 1.521 1.421 1.41
1.50 M11 ×1.5 9.676 9.376 8.60
9.60
M1.8×0.2 (1.621) (1.583) 1.61
1.40 ※1 M11 ×1.25 9.912 9.647 9.85
8.85
M2 ×0.4 1.679 1.567 1.65 M11 ×1 10.153 9.917 10.09
1.51 9.09
M2 ×0.25 (1.785) (1.729) 1.77 M11 ×0.75 10.378 10.188 10.33
M2.2×0.45 1.838 1.713 1.50
1.81 ※1 M11 ×0.5 10.599 10.459 9.33
10.56
M2.2×0.25 (1.985) (1.929) 1.97
1.61 M12 ×1.75 10.441 10.106 10.4
9.56
※1 M2.3×0.4 1.979 1.867 1.95 M12 ×1.5 10.676 10.376 10.60
1.65 9.60
※1 M2.3×0.25 2.085 2.029 2.07 M12 ×1.25 10.912 10.647 10.85
M2.5×0.45 2.138 2.013 1.77
2.11 M12 ×1 11.153 10.917 10.10
11.09
M2.5×0.35 2.221 2.121 2.20
1.81 ※2 M12 ×0.75 11.378 11.188 11.33
10.33
※ M2.6×0.45
1
2.238 2.113 2.21 ※1 M12 ×0.5 11.599 11.459 11.56
1.97 10.56
※1 M2.6×0.35 2.321 2.221 2.30 ※2 M13 ×1.75 11.441 11.106 11.4
1.95 10.4
M3 ×0.5 2.599 2.459 2.56 ※1 M13 ×1.5 11.676 11.376 11.60
※1 3M0.6 2.440 2.280 2.07
2.40 ※2 M13 ×1.25 11.912 11.647 10.60
11.85
M3 ×0.35 2.721 2.621 2.70
2.11 ※1 M13 ×1 12.153 11.917 12.09
10.85
M3.5×0.6 3.010 2.850 2.97 ※2 M13 ×0.75 12.378 12.188 12.33
2.20 11.09
M3.5×0.35 3.221 3.121 3.20 ※1 M13 ×0.5 12.599 12.459 12.56
M4 ×0.7 3.422 3.242 2.21
3.38 M14 ×2 12.210 11.835 11.56
12.1
※1 4M0.75 3.326 3.106 3.27
2.30 ※2 M14 ×1.75 12.441 12.106 12.4
12.1
M4 ×0.5 3.599 3.459 3.56 M14 ×1.5 12.676 12.376 12.60
2.56 12.60
M4.5×0.75 3.878 3.688 3.83 M14 ×1.25 12.912 12.647 12.85
M4.5×0.5 4.099 3.959 2.70
4.06 M14 ×1 13.153 12.917 13.09
13.09
M5 ×0.8 4.334 4.134 4.28
2.97 ※2 M14 ×0.75 13.378 13.188 13.33
13.60
※ 5M0.9
1
4.170 3.930 4.11 ※1 M14 ×0.5 13.599 13.459 13.56
3.20 14.09
※2 M5 ×0.75 4.378 4.188 4.33 ※2 M15 ×2 13.210 12.835 13.1
M5 ×0.5 4.599 4.459 3.38
4.56 M15 ×1.5 13.676 13.376 14.1
13.60
※1 M5.5×0.9 4.670 4.430 3.56
4.61 ※2 M15 ×1.25 13.912 13.647 14.60
13.85
M5.5×0.75 4.878 4.688 4.83
3.83 M15 ×1 14.153 13.917 14.09
15.09
M5.5×0.5 5.099 4.959 5.06 ※2 M15 ×0.75 14.378 14.188 14.33
4.06 15.60
M6 ×1 5.153 4.917 5.09 ※1 M15 ×0.5 14.599 14.459 14.56
M6 ×0.75 5.378 5.188 4.28
5.33 M16 ×2 14.210 13.835 16.09
14.1
※1 M6 ×0.5 5.599 5.459 5.56
4.56 M16 ×1.5 14.676 14.376 14.60
15.6
※2 M6.5×0.5 6.099 5.959 6.06 ※2 M16 ×1.25 14.912 14.647 14.85
M5.5×0.5 5.099 4.959 5.06 16.1
M7 ×1 6.153 5.917 6.09 M16 ×1 15.153 14.917 15.09
M7 ×0.75 6.378 6.188 5.09
6.33 ※2 M16 ×0.75 15.378 15.188 16.60
15.33
※1 M7 ×0.5 6.599 6.459 6.56
5.33 ※1 M16 ×0.5 15.599 15.459 15.56
17.09
※2 M7.5×0.5 7.099 6.959 7.06 ※2 M17 ×2 15.210 14.835 15.1
5.56 17.6
M8 ×1.25 6.912 6.647 6.85 M17 ×1.5 15.676 15.376 15.60
M8 ×1 7.153 6.917 6.09
7.09 ※2 M17 ×1.25 15.912 15.647 15.85
M8 ×0.75 tap drill sizes indicated
The recommended 7.378 above are 7.188 7.33 Threads.
for JIS 6H (Class 2) Metric M17 ×1 16.153 15.917 16.09
• D1:
※1 Minor diameter of JIS 6H (Class
M81 ×0.5 2) internal thread.7.459
7.599 The Minor diameters D1 shown in ( ) are of
7.56 ※5H2 (Class×0.75
M17 2) for coarse threads and of 4H • 5H (Class16.188
16.378 1) for fine threads. 16.33
• 呼び※ 印のものはJISより削除されています。
•※ ※2 M17 ×0.5
2
呼び※ M8.5×1
印のものはJISに規定されていない。 7.653 7.417 7.59 16.599 16.459 16.56
Information


2
Technical


•※※Marked
2 sizes have been eliminated
M8.5×0.75 7.878 from JIS. 7.688 7.83 M18 ×2.5 15.744 15.294 15.6
※2 M8.5×0.5 8.099 7.959 8.06 M18 ×2 16.210 15.835 16.1
The recommended tap drill sizes indicated above are for JIS 6H (Class 2) Metric Threads.
• D1: Minor diameter of JIS 6H (Class 2) internal thread. The Minor diameters D1 shown in ( ) are of 5H (Class 2) for coarse threads and of 4H • 5H (Class 1) for fine threads.
• Sizes marked with ※1 are already removed from JIS.
• Sizes marked with ※2 are not specified by JIS.
• ※Marked sizes have been eliminated from JIS.


Technical-36