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ALLCAP Limited

24c Morelands Trading Estate, Bristol Road, Gloucester. GL1 5RZ

Tel. 01452 525800 Fax. 01452 331125

www.allcap.co.uk e-mail sales@allcap.co.uk

Metric – Imperial

Conversions And Equivalents

Metric

Diameters

M.M.

Equivalent

Diameter

in

Decimal

Inches

Nearest

Equivalent

Diameter In

BA

Inches / Decimal

Nearest

Equivalent

Unified

Numbered Size

Inches

Metric

MM. Inch.

UNC

Normal

Series

UNC

Heavy

Series

UNF

BSW

&

BSF

BA

Inches

Metric

Coarse

Thread

MM.

Fine

Thread

MM.

UNC

UNF

BSW

BSF

BA

2

0.078

9BA

.075

No2

.086

4

0.157

.075

0.4

56

64

65.1

2.5

0.098

7BA

.095

No3

.099

5

1.97

.172

0.45

48

56

52.9

3

0.118

6BA

.110

No4

.112

5.5

.216

.187

.187

.193

0.5

40

48

47.9

3.5

0.137

5BA

.126

No5

.125

6

.236

.220

0.6

40

44

43.1

4

0.158

4BA

.142

No6

.138

7

.276

.250

.250

.248

0.7

32

40

38.5

3BA

.161

2.82

34.8

5

0.197

2BA

.185

No8

.164

8

.315

.250

.250

.324

0.8

32

36

31.4

3/16

.187

No10

.190

.212

.212

24

32

OBA

.236

.413

25.4

6

0.236

1/4

.250

10

.394

.438

.500

.438

.445

1.0

20

28

20

26

8

0.315

5/16

.312

13

.512

.500

5.62

.500

.525

1.25

1

18

24

18

22

10

0.393

3/8

.375

17

.669

.562

.687

.562

.600

1.5

1.25

16

24

16

20

7/16

.437

.687

.687

.710

14

20

14

18

12

0.472

1/2

.500

19

.748

.750

8.75

.750

.820

1.75

1.25

13

20

12

16

14

0.551

9/16

.570

22

.866

.812

9.37

.812

.920

2

1.5

12

18

12

16

16

0.629

5/8

.625

24

.945

.938

1.062

.938

1.010

2

1.5

11

18

11

14

18

0.709

11/16

.689

27

1.063

1.031

1.031

1.200

2.5

1.5

12

11

14

20

0.787

3/4

.750

30

1.181

1.125

1.250

1.125

1.200

2.5

1.5

10

16

10

12

22

0.866

7/8

.875

32

1.260

1.312

1.437

1.312

1.300

2.5

1.5

9

14

9

11

24

0.915

1

1.000

36

1.417

1.500

1.625

1.500

1.480

3

2

8

12

8

10

27

1.063

1.1/8

1.125

41

1.614

1.687

1.812

1.687

1.670

3

2

7

12

7

9

30

1.181

1.1/4

1.250

46

1.811

1.875

2.00

1.875

1.860

3.5

2

7

12

7

9

33

1.299

1.3/8

1.375

50

1.968

2.062

2.187

2.062

2.050

3.5

2

6

12

6

8

36

1.417

1.1/2

1.500

55

2.166

2.500

2.375

2.500

2.220

4

3

6

12

6

8

39

1.535

1.5/8

1.634

60

2.362

2.437

2.562

2.437

2.410

4

3

6

5

42

1.653

1.3/4

1.752

65

2.559

2.625

2.750

2.625

2.580

4.5

5

5

7

48

1.889

1.7/8

1.889

75

2.953

2.812

2.937

2.812

5

5

4.5

52

2.047

2

2

80

3.149

3.000

3.125

3.000

2.760

5

4.5

4.5

7

56

2.204

2.1/4

2.250

85

3.346

3.375

3.500

3.375

3.150

5.5

4.5

4

6

60

2.362

2.3/8

2.375

90

3.543

3.562

3.562

3.340

5.5

4

6

64

2.519

2.1/2

2.500

95

3.740

3.750

3.875

3.750

3.550

6

4

4

6

68

2.677

2.3/4

2.750

100

3.937

4.125

4.250

4.125

3.890

6

4

3.5

6

72

2.834

2.7/8

2.875

105

4.133

4.312

4.312

4.050

6

4

6

76

2.992

3

3.000

110

4.329

4.500

4.652

4.500

4.180

6

4

3.5

5

80

3.149

3.1/8

3.125

115

4.525

4.678

4.678

4.340

6

3.5