Metric Thread Plug Gage Pitch Diameters

M1.6 x 0.35

1.373

1.458

0.05406

0.05740

M1.8 x 0.35

1.573

1.658

0.06193

0.06528

M2 x 0.4

1.740

1.830

0.06850

0.07205

M2.2 x 0.45

1.908

2.003

0.07512

0.07886

M2.5 x 0.45

2.208

2.303

0.08693

0.09067

M3 x 0.5

2.675

2.775

0.10531

0.10925

M3.5 x 0.6

3.110

3.222

0.12244

0.12685

M4 x 0.7

3.545

3.663

0.13957

0.14421

M4.5 x 0.75

4.013

4.131

0.15799

0.16264

M5 x 0.8

4.480

4.605

0.17638

0.18130

M5.5 x 0.75

5.013

5.131

0.19736

0.20201

M6 x 1.0

5.350

5.500

0.21063

0.21654

M6.3 x 1.0

5.650

5.800

0.22244

0.22835

M7 x 1.0

6.350

6.500

0.25000

0.25591

M8 x 1.25

7.188

7.348

0.28299

0.28929

M8 x 1.0

7.350

7.500

0.28937

0.29528

M9 x 1.25

8.188

8.348

0.32236

0.32866

M10 x .75

9.513

9.645

0.37453

0.37972

M10 x 1.5

9.026

9.206

0.35535

0.36244

M10 x 1.25

9.188

9.348

0.36173

0.36803

M11 x 1.5

10.026

10.206

0.39472

0.40181

M12 x 1.0

11.350

11.510

0.44685

0.45315

M12 x 1.50

11.026

11.216

0.43409

0.44157

M12 x 1.75

10.863

11.063

0.42768

0.43555

M12 x 1.25

11.188

11.368

0.44047

0.44756

M14 x 2.0

12.701

12.913

0.50004

0.50838

M14 x 1.5

13.026

13.216

0.51283

0.52031

M15 x 1.5

14.026

14.216

0.55220

0.55968

M15 x 1.0

14.350

14.510

0.56496

0.57126

M16 x 2.0

14.701

14.913

0.57878

0.58712

M16 x 1.5

15.026

15.216

0.59157

0.59905

M17 x 1.0

16.350

16.510

0.64370

0.65000

M17 x 1.5

16.026

16.216

0.63094

0.63842

M18 x 2.5

16.376

16.600

0.64472

0.65354

M18 x 1.5

17.026

17.216

0.67031

0.67779

M20 x 1.0

19.350

19.510

0.76181

0.7681

M20 x 2.5

18.376

18.600

0.72346

0.73228

M20 x 1.5

19.026

19.216

0.74905

0.75653

M22 x 2.5

20.376

20.600

0.80220

0.81102

M22 x 1.5

21.026

21.216

0.82779

0.83527

M24 x 3.0

22.051

22.316

0.86815

0.87858

M24 x 2.0

22.701

22.925

0.89374

0.90256

M25 x 2.0

23.701

23.925

0.93311

0.94193

M25 x 1.5

24.026

24.226

0.94590

0.95378

M26 x 1.5

25.026

25.226

0.98527

0.99315

M26 x 1.0

25.350

25.520

0.99803

1.00472

M27 x 3.0

25.051

25.316

0.98626

0.99669

M27 x 2.0

25.701

25.925

1.01185

1.02067

M28 x 2.0

26.701

26.925

1.05122

1.06004

M28 x 1.5

27.026

27.226

1.06401

1.07189

M28 x 1.0

27.350

27.520

1.07677

1.08346

M30 x 1.5

29.026

29.226

1.14276

1.15063

M30 x 3.5

27.727

28.007

1.09161

1.10264

M30 x 2.0

28.701

28.925

1.2996

1.13878

M32 x 2.0

30.701

30.925

1.20870

1.21752

M32 x 1.5

31.026

31.226

1.22149

1.22937

M33 x 3.5

30.727

31.007

1.20972

1.22075

M33 x 2.0

31.701

31.925

1.24807

1.25689

M35 x 1.5

34.026

34.226

1.33960

1.34748

M36 x 2.0

34.701

34.925

1.36618

1.37500

M36 x 4.0

33.402

33.702

1.31504

1.32685

M36 x 3.0

34.051

34.316

1.34059

1.35102

M38 x 1.5

37.026

37.226

1.45771

1.46559

M39 x 2.0

37.701

37.925

1.48429

1.49311