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Tapping Drill Sizes

Metric Coarse Sizes

Tap Size Drill Size
1.1mm x .25 .85mm
1.2mm x .25 .95mm
1.4mm x .3 1.1mm
1.6mm x .35 1.25mm
1.7mm x .35 1.3mm
1.8mm x .35 1.45mm
10mm x 1.5 8.5mm
11mm x 1.5 9.5mm
12mm x 1.5 10.5mm
12mm x 1.75 10.2mm
14mm x 1 13mm
14mm x 2 12mm
16mm x 2 14mm
18mm x 2.5 15.5mm
1mm x .25 .75mm
2.2mm x .45 1.75mm
2.5mm x .45 2.05mm
20mm x 2.5 17.5mm
22mm x 2.5 19.5mm
24mm x 3 21mm
27mm x 3 24mm
2mm x .4 1.6mm
3.5mm x .6 2.9mm
30mm x 3.5 26.5mm
33mm x 3.5 29.5mm
36mm x 4 32mm
39mm x 4 35mm
3mm x .5 2.5mm
4.5mm x .75 3.7mm
4mm x .7 3.3mm
5mm x .8 4.2mm
6mm x 1 5mm
7mm x 1 6mm
8mm x 1.25 6.8mm
9mm x 1.25 7.8mm

Metric Fine Sizes

Tap Size Drill Size
10mm x .75 9.25mm
10mm x 1 9mm
10mm x 1.25 8.8mm
11mm x 1 10mm
12mm x .75 11.25mm
12mm x 1 11mm
14mm x 1.25 12.8mm
14mm x 1.5 12.5mm
16mm x 1 15mm
16mm x 1.5 14.5mm
18mm x 1 17mm
18mm x 2 16mm
20mm x 1 19mm
20mm x 1.5 18.5mm
20mm x 2 18mm
22mm x 1 21mm
22mm x 1.5 20.5mm
22mm x 2 20mm
24mm x 1.5 22.5mm
24mm x 2 22mm
26mm x 1.5 24.5mm
27mm x 1.5 25.5mm
27mm x 2 25mm
28mm x 1.5 26.5mm
30mm x 1.5 28.5mm
30mm x 2 28mm
33mm x 2 31mm
36mm x 3 33mm
39mm x 3 36mm
4mm x .35 3.6mm
4mm x .5 3.5mm
5mm x .5 4.5mm
6mm x .5 5.5mm
6mm x .75 5.25mm
7mm x .75 6.25mm
8mm x .5 7.5mm
8mm x .75 7.25mm
9mm x 1 8mm