Tap Chart - Metric Threads

Tap size Basic major
dia (mm)
Basic major dia
(inch)
mm per thread Drill size
(mm)
Drill size
(inch)

M1.6 x 0.35

1,6mm

.0630

.35

1,25mm

#55

M2 x 0.4

2mm

.0787

.4

1,6mm

#52

M2.5 x 0.45

2,5mm

.0984

.45

2,05mm

#46

M3 x 0.5

3mm

.1181

.5

2,5mm

#39

M3.5 x 0.6

3,5mm

.1378

.6

2,9mm

#32

M4 x 0.7

4mm

.1575

.7

3,3mm

#30

M5 x 0.8

5mm

.1969

.8

4,2mm

#19

M6 x 1

6mm

.2362

1

5mm

#8

M8 x 1.25

8mm

.3150

1.25

6,8mm

H

M8 x 1

8mm

.3150

1

7mm

J

M10 x 1.5

10mm

.3937

1.5

8,5mm

R

M10 x 1.25

10mm

.3937

1.25

8,8mm

11/32

M12 x 1.75

12mm

.4724

1.75

10,2mm

13/32

M12 x 1.25

12mm

.4724

1.25

10,8mm

27/64

M14 x 2

14mm

.5512

2

12mm

15/32

M14 x 1.5

14mm

.5512

1.5

12,5mm

1/2

M16 x 2

16mm

.6299

2

14mm

35/64

M16 x 1.5

16mm

.6299

1.5

14,5mm

37/64

M18 x 2.5

18mm

.7087

2.5

15,5mm

39/64

M18 x 1.5

18mm

.7087

1.5

16,5mm

21/32

M20 x 2.5

20mm

.7874

2.5

17,5mm

11/16

M20 x 1.5

20mm

.7874

1.5

18,5mm

47/64

M22 x 2.5

22mm

.8661

2.5

19,5mm

49/64

M22 x 1.5

22mm

.8661

1.5

20,5mm

13/16

M24 x 3

24mm

.9449

3

21mm

53/64

M24 x 2

24mm

.9449

2

22mm

7/8

M27 x 3

27mm

1.0630

3

24mm

15/16

M27 x 2

27mm

1.0630

2

25mm

1