Bsw Threads

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BSW

BRITISH STANDARD WHITWORTH
55 °
SIZE TPI
BSW 55
 
 
 

EXTERNAL
MAJORS
INCH
MM

INTERNAL
MINORS
INCH
MM

DRILL SIZE
CLEARANCE HOLE
INCH
MM
1.99
 
2.67
 

DRILL SIZE
TAPPED HOLE
INCH
MM
1.15
 
1.90
 

1/16

60

0.0620

1.59

0.0410

1.05

3/32

48

0.0940

2.38

0.0670

1.70

1/8

40

0.1250

3.18

0.0930

2.36

9/64

3.57

# 38

2.60

5/32

32

0.1560

3.97

0.1160

2.95

11/64

4.37

1/8

3.20

3/16

24

0.1870

4.75

0.1340

3.40

13/64

5.16

# 27

3.70

7/32

24

0.2190

5.60

0.1660

4.22

15/64

5.95

# 19

4.30

1/4

20

0.2500

6.35

0.1860

4.72

17/64

6.75

#9

5.00

5/16

18

0.3120

7.92

0.2410

6.12

21/64

8.33

1/4

6.40

3/8

16

0.3750

9.53

0.2950

7.49

25/64

9.92

5/16

8.00

7/16

14

0.4370

11.10

0.3460

8.79

29/64

11.51

U

9.40

1/2

12

0.5000

12.70

0.3930

9.98

17/32

13.49

27/64

10.80

9/16

12

0.5630

14.29

0.4560

11.58

19/32

15.08

15/32

12.00

5/8

11

0.6250

15.88

0.5090

12.93

21/32

16.67

17/32

13.50

11/16

11

0.6880

17.48

0.5710

14.50

 

17.75

 

15.00

3/4

10

0.7500

19.05

0.6220

15.80

25/32

19.84

21/32

17.00

13/16

10

0.8130

20.65

0.6840

17.37

 

21.00

 

18.00

7/8

9

0.8750

22.23

0.7330

18.62

29/32

23.02

49/64

19.50

15/16

9

0.9380

23.83

0.7950

20.19

 

24.00

 

20.75

1

8

1.0000

25.40

0.8400

21.34

1 1/16

26.99

7/8

22.50

1 1/8

7

1.1250

28.58

0.9420

23.93

1 3/16

30.16

1

25.50

1 1/4

7

1.2500

31.75

1.0670

27.10

1 5/16

33.34

1 7/16

28.50

1 3/8

6

1.3750

34.93

1.1620

29.51

1 7/16

36.51

1 7/32

31.00

1 1/2

6

1.5000

38.10

1.2870

32.69

1 9/16

39.69

1 11/32

34.50

1 5/8

5

1.6250

41.28

1.3690

34.77

41.50

5

1.7500

44.45

1.4940

37.95

1 7/8

4.5

1.8750

47.63

1.5910

40.40

2

4.5

2.0000

50.80

1.7150

43.57

2 1/4

4

 

 

 

 

 
 
 
 
 

35.50

1 3/4

 
 
 
 
 

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