Thread Size Type Cut Tap Roll Tap STI (Helicoil)
0 - 80 Machine
46.9 thou
1.19 mm
53.8 thou
1.37 mm
63.0 thou
1.60 mm
2 - 56 Machine
70.0 thou
1.78 mm
81.0 thou
2.06 mm
96.0 thou
2.44 mm
4 - 40 Machine
89.0 thou
2.26 mm
99.5 thou
2.53 mm
120.0 thou
3.05 mm
6 - 32 Machine
106.5 thou
2.71 mm
125.0 thou
3.18 mm
159.0 thou
4.04 mm
8 - 32 Machine
136.0 thou
3.45 mm
149.5 thou
3.80 mm
189.0 thou
4.80 mm
10 - 24 Machine
149.5 thou
3.80 mm
177.0 thou
4.50 mm
234.4 thou
5.95 mm
10 - 32 Machine
159.0 thou
4.04 mm
182.0 thou
4.62 mm
218.8 thou
5.56 mm
1/4 - 20 UNC
201.0 thou
5.11 mm
228.0 thou
5.79 mm
265.6 thou
6.75 mm
5/16 - 18 UNC
257.0 thou
6.53 mm
281.2 thou
7.14 mm
328.1 thou
8.33 mm
3/8 - 16 UNC
312.5 thou
7.94 mm
343.7 thou
8.73 mm
390.6 thou
9.92 mm
1/2 - 13 UNC
421.9 thou
10.72 mm
468.7 thou
11.91 mm
531.2 thou
13.49 mm
5/8 - 11 UNC
531.2 thou
13.49 mm
578.1 thou
14.68 mm
656.2 thou
16.67 mm
3/4 - 10 UNC
656.2 thou
16.67 mm
687.5 thou
17.46 mm
781.2 thou
19.84 mm
1 - 8 UNC
875.0 thou
22.23 mm
937.5 thou
23.81 mm
1046.9 thou
26.59 mm
M6 x 1.0 Metric
196.9 thou
5.00 mm
216.5 thou
5.50 mm
248.0 thou
6.30 mm
M8 x 1.25 Metric
267.7 thou
6.80 mm
291.3 thou
7.40 mm
326.8 thou
8.30 mm
M10 x 1.5 Metric
334.6 thou
8.50 mm
366.1 thou
9.30 mm
409.4 thou
10.40 mm
M12 x 1.75 Metric
401.6 thou
10.20 mm
440.9 thou
11.20 mm
488.2 thou
12.40 mm