British Metric Coarse Thread Chart

Thread Angle 60 degrees

OD
MM

Imperial

TPI

Pitch
Imperial

Pitch
in
MM

Core Dia
Imperial

Core Dia
MM

Thread
Depth Male
Imperial

Thread
Depth Male
MM

Thread
Depth Female
Imperial

Thread
Depth Female
MM

Hex
A/Flats
MM

Head
Depth
MM

Tapping
Size
Imperial

MM

Imperial

1

0.0394

102

0.0098

0.25

0.0274

0.693

0.0060

0.153

0.0053

0.135

0.0290

0.75

69

1.1

0.0433

102

0.0098

0.25

0.0312

0.793

0.0060

0.153

0.0053

0.135

0.0335

0.85

65

1.2

0.0472

102

0.0098

0.25

0.0351

0.893

0.0060

0.153

0.0053

0.135

0.0374

0.95

62

1.4

0.0551

85

0.0118

0.30

0.0407

1.032

0.0072

0.184

0.0064

0.162

0.0433

1.10

57

1.6

0.0630

73

0.0138

0.35

0.0460

1.171

0.0085

0.215

0.0074

0.189

3.2

0.0492

1.25

3/64

1.8

0.0709

73

0.0138

0.35

0.0539

1.371

0.0085

0.215

0.0074

0.189

0.0570

1.45

54

2

0.0787

64

0.0157

0.40

0.0595

1.510

0.0096

0.245

0.0085

0.217

4.00

1.5

0.0630

1.60

1/16

2.2

0.0866

56

0.0177

0.45

0.0648

1.648

0.0109

0.276

0.0096

0.244

0.689

1.75

51

2.3

0.0906

56

0.0177

0.45

0.0688

1.750

0.0109

0.276

0.0096

0.244

0.0730

1.85

49

2.5

0.0984

56

0.0177

0.45

0.0766

1.950

0.0109

0.276

0.0096

0.244

0.0810

2.05

46

2.6

0.1024

56

0.0177

0.45

0.0832

2.05

0.0109

0.276

0.0096

0.244

5.00

0.0870

2.20

44

3

0.1181

50.8

0.0197

0.50

0.0967

2.387

0.0121

0.307

0.0107

0.271

5.50

2.13

0.0984

2.50

40

3.5

0.1378

42.3

0.0236

0.60

0.1088

2.764

0.0145

0.368

0.0128

0.325

0.1142

2.90

33

4

0.1575

36.3

0.0276

0.70

0.1237

3.141

0.0169

0.429

0.0149

0.379

7.00

2.93

0.1300

3.30

30

4.5

0.1772

33.9

0.0295

0.75

0.141

3.580

0.0181

0.460

0.0160

0.406

0.1500

3.80

24

5

0.1968

31.8

0.0315

0.80

0.1582

4.019

0.0193

0.491

0.0170

0.433

8.00

3.65

0.1650

4.20

19

5.5

0.2165

28.2

0.0354

0.90

0.1705

4.331

0.0230

0.584

0.0205

0.520

0.1770

4.50

16

6

0.2362

25.4

0.0394

1.00

0.1880

4.773

0.0241

0.613

0.0213

0.541

10.00

4.15

0.1970

5.00

9

7

0.2756

25.4

0.0394

1.00

0.2274

5.773

0.0241

0.613

0.0213

0.541

11.00

0.2362

6.00

B

8

0.3150

20.3

0.0492

1.25

0.2668

6.466

0.0301

0.767

0.0267

0.677

13.00

5.65

0.2720

6.90

I

9

0.3543

20.3

0.0492

1.25

0.2939

7.466

0.0302

0.767

0.0267

0.677

13.00

0.3071

7.80

N

10

0.3937

16.9

0.0590

1.50

0.3213

8.160

0.0362

0.920

0.320

0.812

17.00

7.18

0.3346

8.50

Q

OD
MM

Imperial

TPI

Pitch
Imperial

Pitch
in
MM

Core Dia
Imperial

Core Dia
MM

Thread
Depth Male
Imperial

Thread
Depth Male
MM

Thread
Depth Female
Imperial

Thread
Depth Female
MM

Hex
A/Flats
MM

Head
Depth
MM

Tapping
Size
Imperial

MM

Imperial

11

0.4331

16.9

0.0590

1.50

0.3607

9.160

0.0362

0.920

0.320

0.812

0.3740

9.50

3/8

12

0.4724

14.5

0.0689

1.75

0.3878

9.852

0.0423

1.074

0.0373

0.947

19.00

8.18

0.4015

10.20

Y

14

0.5512

12.7

0.0787

2.00

0.4546

11.546

0.0483

1.227

0.0426

1.083

22.00

0.4724

12.00

15/32

16

0.6299

12.7

0.0787

2.00

0.5333

13.546

0.0483

1.227

0.0426

1.083

24.00

10.18

0.551

14.00

35/64

18

0.7087

10.2

0.0984

2.50

0.5879

14.932

0.0604

1.534

0.0533

1.353

27.00

0.6102

15.50

39/64

20

0.7874

10.2

0.0984

2.50

0.6666

16.932

0.0604

1.534

0.0533

1.353

30.00

13.22

0.6889

17.50

11/16

22

0.8661

10.2

0.0984

2.50

0.7453

18.932

0.0604

1.534

0.0533

1.353

32.00

0.7677

19.50

49/64

24

0.945

8.5

0.1181

3.00

0.8002

20.320

0.0724

1.840

0.0640

1.624

36.00

15.22

0.8267

21.00

53/64

26

1.024

8.5

0.1181

3.00

0.8792

22.32

0.0724

1.840

0.0640

1.624

0.9055

23.00

29/32

27

1.063

8.5

0.1181

3.00

0.9182

23.320

0.0724

1.840

0.0640

1.624

41.00

0.9448

24.00

15/16

28

1.102

8.5

0.1181

3.00

0.9572

24.320

0.0724

1.840

0.0640

1.624

0.9920

25.2

63/64

30

1.181

7.3

0.1378

3.50

1.0120

25.706

0.0845

2.147

0.0781

1.894

46.00

19.26

1.0430

26.50

1 - 3/64

32

1.260

7.3

0.1378

3.50

1.0910

27.71

0.0845

2.147

0.0781

1.894

1.1220

28.5

1 - 1/8

33

1.299

7.3

0.1378

3.50

1.1300

28.706

0.0845

2.147

0.0781

1.894

50.00

1.1614

29.50

1 - 5/32

34

1.339

7.3

0.1378

3.50

1.1700

29.71

0.0845

2.147

0.0781

1.894

1.210

30.70

1 - 13/64

36

1.417

6.4

0.1575

4.00

1.2238

31.093

0.0966

2.454

0.0852

2.165

55.00

23.26

1.260

32.00

1 - 1/4

38

1.496

6.4

0.1575

4.00

1.3028

33.092

0.0966

2.454

0.0852

2.165

1.340

34.00

1 - 11/32

39

1.535

6.4

0.1575

4.00

1.3418

34.093

0.0966

2.454

0.0852

2.165

60.00

1.377

35.00

1 - 3/8

40

1.575

6.4

0.1575

4.00

1.3818

35.100

0.0966

2.454

0.0852

2.165

1.4252

36.20

1 - 29/64

42

1.654

5.6

0.1772

4.50

1.4366

36.480

0.1087

2.760

0.959

2.436

1.476

37.50

1 - 15/32

44

1.732

5.6

0.1772

4.50

1.5146

38.48

0.1087

2.760

0.959

2.436

1.551

39.4

1 - 35/64

45

1.772

5.6

0.1772

4.50

1.5546

39.480

0.1087

2.760

0.0959

2.436

1.594

40.50

1 - 19/32

OD
MM

Imperial

TPI

Pitch
Imperial

Pitch
in
MM

Core Dia
Imperial

Core Dia
MM

Thread
Depth Male
Imperial

Thread
Depth Male
MM

Thread
Depth Female
Imperial

Thread
Depth Female
MM

Hex
A/Flats
MM

Head
Depth
MM

Tapping
Size
Imperial

MM

Imperial

46

1.811

5.6

0.1772

4.50

1.5936

40.48

0.1087

2.760

0.0959

2.435

1.653

42.00

1 - 21/32

48

1.890

5.1

0.1968

5.00

1.6486

41.866

0.1207

3.067

0.1065

2.706

1.692

43.00

1 - 23/32

50

1.969

5.1

0.1968

5.00

1.7276

43.870

0.1207

3.067

0.1065

2.706

1.772

45.00

1 - 25/32

52

2.047

5.1

0.1968

5.00

1.8056

45.866

0.1207

3.067

1.1065

2.706

1.850

47.00

1 - 55/64

56

2.205

4.6

0.2165

5.50

1.9394

49.252

0.1328

3.374

0.1172

2.977

1.988

50.50

2

60

2.362

4.6

0.2165

5.50

2.0964

53.252

0.1328

3.374

0.1172

2.977

2.146

54.50

2 - 5/32

64

2.520

4.2

0.2362

6.00

2.2302

56.638

0.1449

3.681

0.1279

3.248

2.283

58.00

2 - 9/32

68

2.677

4.2

0.2362

6.00

2.3872

60.638

0.1449

3.681

0.1279

3.248

2.441

62.00

2 - 19/32

72

2.835

4.2

0.2362

6.00

2.5452

64.64

0.1449

3.681

0.1279

3.248

2.598

66.00

2 - 19/32

76

2.992

4.2

0.2362

6.00

2.7022

68.640

0.1449

3.681

0.1279

3.248

2.756

70.00

2 - 3/4

80

3.150

4.2

0.2362

6.00

2.8602

72.64

0.1449

3.681

0.1279

3.248

2.933

74.50

2 - 15/16

85

3.346

4.2

0.2362

6.00

3.0562

77.640

0.1449

3.681

0.1279

3.248

3.110

79.00

3 - 7/64

90

3.543

4.2

0.2362

6.00

3.2532

82.64

0.1449

3.681

0.1279

3.248

3.307

84.00

3 - 5/16

95

3.740

4.2

0.2362

6.00

3.4502

87.64

0.1449

3.681

0.1279

3.248

3.504

89.00

3 - 1/2

100

3.937

4.2

0.2362

6.00

3.6472

92.64

0.1449

3.681

0.1279

3.248

3.700

94.00

3 - 45/64

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