Screw Size

Tapping Drills

Clearance Drills

Nom. Dia. (mm)

Pitch (mm)

Series

Drill Size

Dec. Equiv.

Close Fit

Free Fit

(65-75% thread)

Drill Size

Dec. Equiv.

Drill Size

Dec. Equiv.

1

0.2

Fine

0.8

0.0315

1.05

0.0413

1.2

0.0472

0.25

Coarse

0.75

0.0295

1.1

0.2

Fine

0.9

0.0354

1.15

0.0453

1.3

0.0512

0.25

Coarse

0.85

0.0335

1.2

0.2

Fine

1

0.0394

1.3

0.0512

1.5

0.059

0.25

Coarse

0.95

0.0374

1.4

0.2

Fine

1.2

0.0472

1.5

0.0591

1.7

0.0669

0.3

Coarse

1.1

0.0433

1.6

0.2

Fine

1.4

0.0551

1.7

0.0669

2

0.0787

0.35

Coarse

1.25

0.0492

1.8

0.2

Fine

1.6

0.063

1.9

0.0748

2.2

0.0866

0.35

Coarse

1.45

0.0571

2

0.25

Fine

1.75

0.0689

2.2

0.0866

2.6

0.1024

0.4

Coarse

1.6

0.063

2.2

0.25

Fine

1.95

0.0768

2.4

0.0945

2.8

0.1102

0.45

Coarse

1.75

0.0689

2.5

0.35

Fine

2.15

0.0846

2.7

0.1063

3.1

0.122

0.45

Coarse

2.05

0.0807

3

0.35

Fine

2.65

0.1043

3.2

0.126

3.6

0.1417

0.5

Coarse

2.5

0.0984

3.5

0.35

Fine

3.15

0.124

3.7

0.1457

4.2

0.1653

0.6

Coarse

2.9

0.1142

4

0.5

Fine

3.5

0.1378

4.3

0.1693

4.8

0.189

0.7

Coarse

3.3

0.1299

4.5

0.5

Fine

4

0.1575

4.8

0.189

5.3

0.2087

0.75

Coarse

3.7

0.1457

5

0.5

Fine

4.5

0.1772

5.3

0.2087

5.8

0.2283

0.8

Coarse

4.2

0.1654

6

0.75

Fine

5.25

0.2067

6.4

0.252

7

0.2756

1

Coarse

5

0.1969

7

0.75

Fine

6.25

0.2461

7.4

0.2913

8

0.315

1

Coarse

6

0.2362

8

0.75

Fine

7.25

0.2854

8.4

0.3307

10

0.3937

1

Fine

7.5

0.2953

1.25

Coarse

6.8

0.2677

9

0.75

Fine

8.25

0.3248

9.5

0.374

10.5

0.4134

1

Fine

8

0.315

1.25

Coarse

7.8

0.3071

10

0.75

Fine

9.25

0.3642

10.5

0.4134

12

0.4724

1

Fine

9

0.3543

1.25

Fine

8.8

0.3465

1.5

Coarse

8.5

0.3346

11

0.75

Fine

10.25

0.4035

12

0.4724

13

0.5118

1

Fine

10

0.3937

1.5

Coarse

9.5

0.374

12

1

Fine

11

0.4331

13

0.5118

15

0.5905

1.25

Fine

10.75

0.4232

1.5

Fine

10.5

0.4134

1.75

Coarse

10.2

0.4016

14

1

Fine

13

0.5118

15

0.5905

17

0.6693

1.25

Fine

12.8

0.5039

1.5

Fine

12.5

0.4921

2

Coarse

12

0.4724

15

1

Fine

14

0.5512

16

0.6299

18

0.7087

1.5

Fine

13.5

0.5315

16

1

Fine

15

0.5906

17

0.6693

19

0.748

1.5

Fine

14.5

0.5709

2

Coarse

14

0.5512

17

1

Fine

16

0.6299

18

0.7087

20

0.7874

1.5

Fine

15.5

0.6103

18

1

Fine

17

0.6693

19

0.748

21

0.8268

1.5

Fine

16.5

0.6496

2

Fine

16

0.6299

2.5

Coarse

15.5

0.6102

20

1

Fine

19

0.748

21

0.8268

24

0.9449

1.5

Fine

18.5

0.7283

2

Fine

18

0.7087

2.5

Coarse

17.5

0.689

22

1

Fine

21

0.8268

23

0.9055

26

1.0236

1.5

Fine

20.5

0.8071

2

Fine

20

0.7874

2.5

Coarse

19.5

0.7677

24

1

Fine

23

0.9055

25

0.9842

28

1.1024

1.5

Fine

22.5

0.8858

2

Fine

22

0.8661

3

Coarse

21

0.8268

25

1

Fine

24

0.9449

26

1.0236

30

1.1811

1.5

Fine

23.5

0.9252

2

Fine

23

0.9055

26

1.5

Fine

24.5

0.9646

27

1

Fine

26

1.0236

28

1.1024

32

1.2598

1.5

Fine

25.5

1.0039

2

Fine

25

0.9843

3

Coarse

24

0.9449

28

1

Fine

27

1.063

1.5

Fine

26.5

1.0433

2

Fine

26

1.0236

30

1

Fine

29

1.1417

31

1.2205

35

1.3779

1.5

Fine

28.5

1.122

2

Fine

28

1.1024

3

Fine

27

1.063

3.5

Coarse

26.5

1.0433

32

1.5

Fine

30.5

1.2008

2

Fine

30

1.1811

33

1.5

Fine

31.5

1.2402

34

1.3386

38

1.4961

2

Fine

31

1.2205

3

Fine

30

1.1811

3.5

Coarse

29.5

1.1614