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Recommended Tolerances
For Metric Taps
Unified and ISO

1.5mm - 14mm 16mm - 39mm

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Recommended Tap

for Class of Thread

Pitch Diameter Limits

for Class of Thread

Size

mm

Pitch

mm

2B

3B

4H

6H

Minimum

(Basic)

Max.

2B

Max.

3B

Max.

4H

Max.

6H

M1.5

0.35

GH-2

GH-1

GH-1

GH-2

1.273

1.332

1.317

1.326

1.358

M1.6

0.35

D3

GH-1

GH-1

D3

1.373

1.433

1.418

1.426

1.458

M1.8

0.35

D3

GH-1

GH-1

D3

1.573

1.635

1.619

1.626

1.658

M2

M2

0.45

0.4

GH-2

D3

GH-1

GH-1

GH-1

GH-1

GH-2

D3

1.708

1.740

1.776

1.806

1.759

1.790

1.768

1.796

1.803

1.830

M2.2

0.45

D3

GH-1

GH-1

D3

1.908

1.978

1.960

1.968

2.003

M2.3

0.4

GH-2

GH-1

GH-1

GH-2

2.040

2.108

2.091

2.096

2.130

M2.5

0.45

D3

GH-1

GH-1

D3

2.208

2.280

2.262

2.268

2.303

M2.6

0.45

GH-2

GH-1

GH-1

GH-2

2.308

2.380

2.362

2.368

2.403

M3

M3

0.6

0.5

GH-2

D3

GH-1

GH-1

GH-1

GH-1

GH-2

D3

2.610

2.675

2.692

2.753

2.672

2.733

2.681

2.738

2.722

2.775

M3.5

0.6

D4

GH-1

GH-1

D4

3.110

3.195

3.174

3.181

3.222

M4

M4

0.75

0.7

GH-3

D4

GH-2

GH-2

GH-2

GH-2

GH-3

D4

3.513

3.545

3.606

3.637

3.583

3.614

3.588

3.620

3.631

3.663

M4.5

0.75

D4

GH-2

GH-2

D4

4.013

4.109

4.085

4.088

4.131

M5

M5

M5

1

0.9

0.8

GH-3

GH-3

D4

GH-2

GH-2

GH-2

GH-2

GH-2

GH-2

GH-3

GH-3

D4

4.350

4.415

4.480

4.458

4.520

4.580

4.431

4.493

4.555

4.440

4.501

4.560

4.490

4.549

4.605

M5.5

0.9

GH-3

GH-2

GH-2

GH-3

4.915

5.022

4.995

5.002

5.050

M6

M6

M6.3

1

0.75

1

D5

GH-3

D5

GH-3

GH-2

GH-3

GH-3

GH-2

GH-3

D5

GH-3

D5

5.350

5.513

5.650

5.462

5.615

5.762

5.434

5.589

5.734

5.445

5.598

5.745

5.500

5.645

5.800

M7

M7

1

0.75

D5

GH-4

GH-3

GH-2

GH-3

GH-2

D5

GH-4

6.350

6.513

6.466

6.618

6.437

6.592

6.445

6.598

6.500

6.645

M8

M8

1.25

1

D5

D5

GH-3

GH-3

GH-3

GH-3

D5

D5

7.188

7.350

7.316

7.469

7.284

7.439

7.288

7.445

7.348

7.500

M9

M9

1.25

1

D5

D5

GH-3

GH-3

GH-3

GH-3

D5

D5

8.188

8.350

8.319

8.472

8.286

8.442

8.288

8.445

8.348

8.500

M10

M10

M10

1.5

1.25

1

D6

D5

D5

GH-3

GH-3

GH-3

GH-3

GH-3

GH-3

D6

D5

D5

9.026

9.188

9.350

9.168

9.322

9.475

9.132

9.288

9.444

9.138

9.288

9.445

9.206

9.348

9.500

M11

1.5

GH-5

GH-3

GH-3

GH-5

10.026

10.171

10.135

10.138

10.206

M12

M12

M12

1.75

1.5

1.25

D6

GH-5

D5

GH-3

GH-3

GH-3

GH-3

GH-3

GH-3

D6

GH-5

D5

10.863

11.026

11.188

11.019

11.173

11.327

10.980

11.136

11.292

10.988

11.144

11.300

11.063

11.216

11.368

M14

M14

M14

2

1.5

1.25

D7

D6

D5

GH-3

GH-3

GH-3

GH-3

GH-3

GH-3

D7

D6

D5

12.701

13.026

13.188

12.869

13.178

13.332

12.827

13.140

13.296

12.833

13.144

13.300

12.913

13.216

13.368

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Recommended Tap

for Class of Thread

Pitch Diameter Limits

for Class of Thread

Size

mm

Pitch

mm

2B

3B

4H

6H

Minimum

(Basic)

Max.

2B

Max.

3B

Max.

4H

Max.

6H

M16

M16

2

1.5

D7

D6

GH-4

GH-3

GH-4

GH-3

D7

D6

14.701

15.026

14.874

15.183

14.830

15.143

14.833

15.144

14.913

15.216

M17

1.5

GH-5

GH-3

GH-3

GH-5

16.026

16.185

16.145

16.144

16.216

M18

M18

M18

2.5

2

1.5

D7

GH-6

D6

GH-4

GH-4

GH-3

GH-4

GH-4

GH-3

D7

GH-6

D6

16.376

16.701

17.026

16.568

16.878

17.187

16.520

16.833

17.146

16.516

16.833

17.144

16.600

16.913

17.216

M19

2.5

GH-6

GH-4

GH-4

GH-6

17.376

17.569

17.521

17.516

17.600

M20

M20

M20

2.5

2

1.5

D7

GH-6

D6

GH-4

GH-4

GH-3

GH-4

GH-4

GH-3

D7

GH-6

D6

18.376

18.701

19.026

18.571

18.882

19.190

18.523

18.836

19.149

18.516

18.833

19.144

18.600

18.913

19.216

M22

M22

M22

2.5

2

1.5

D7

GH-6

D6

GH-4

GH-4

GH-3

GH-4

GH-4

GH-3

D7

GH-6

D6

20.376

20.701

21.026

20.575

20.885

21.194

20.525

20.839

21.152

20.516

20.833

21.144

20.600

20.913

21.216

M24

M24

M24

3

2

1.5

D8

D7

GH-5

GH-4

GH-4

GH-3

GH-4

GH-4

GH-3

D8

D7

GH-5

22.051

22.701

23.026

22.267

22.889

23.197

22.213

22.842

23.155

22.221

22.841

23.151

22.316

22.925

23.226

M25

M25

2

1.5

D7

GH-5

GH-4

GH-3

GH-4

GH-3

D7

GH-5

23.701

24.026

23.890

24.199

23.843

24.156

23.841

24.151

23.925

24.226

M26

3

D8

GH-5

GH-5

D8

24.051

24.271

24.216

24.221

24.316

M27

M27

3

2

D8

D7

GH-5

GH-5

GH-5

GH-5

D8

D7

25.051

25.701

25.272

25.893

25.217

25.845

25.221

25.841

25.316

25.925

M28

M28

3

2

D8

D7

GH-5

GH-5

GH-5

GH-5

D8

D7

26.051

26.701

26.274

26.895

26.218

26.846

26.221

26.841

26.316

26.925

M30

M30

M30

3.5

3

2

D9

D8

D7

GH-5

GH-5

GH-5

GH-5

GH-5

GH-5

D9

D8

D7

27.727

28.051

28.701

27.965

28.277

28.898

27.905

28.220

28.849

27.907

28.221

28.841

28.007

28.316

28.925

M32

M32

3.5

2

D9

D7

GH-5

GH-5

GH-5

GH-5

D9

D7

29.727

30.701

29.968

30.901

29.908

30.851

29.907

30.841

30.007

30.925

M33

M33

M33

3.5

3

2

D9

D8

D7

GH-5

GH-5

GH-5

GH-5

GH-5

GH-5

D9

D8

D7

30.727

31.051

31.701

30.969

31.281

31.902

30.909

31.224

31.852

30.907

31.221

31.841

31.007

31.316

31.925

M34

3.5

D9

GH-5

GH-5

D9

31.727

31.971

31.910

31.907

32.007

M36

M36

M36

4

3

2

D9

D8

D7

GH-5

GH-5

GH-5

GH-5

GH-5

GH-5

D9

D8

D7

33.402

34.051

34.701

33.661

34.285

34.906

33.596

34.227

34.855

33.592

34.221

34.841

33.702

34.316

34.925

M38

4

D9

GH-5

GH-5

D9

35.402

35.663

35.598

35.592

35.702

M39

M39

M39

4

3

2

D9

D8

D7

GH-6

GH-6

GH-6

GH-6

GH-6

GH-6

D9

D8

D7

36.402

37.051

37.701

36.665

37.289

37.910

36.599

37.230

37.858

36.592

37.221

37.841

36.702

37.316

37.925