Internal diameter/Symbol

A

B

C

E

F

G

H

K

L

M

Q

R

S

W

X

Y

100M-F

58

44

20

4.2

18.3

19

5

140

(n-1)*19+38

155

G1/4

40

30

78.5

25

27

200M-F

61

51

21

4.3

22.4

23

6

170

(n-1)*23+46

189

G1/4

43

32

92.5

26

35

300M-F

75

65

26

4.5

27.3

27

6

189

(n-1)*28+54

208

G3/8

53

48

99

30

40

400M-F

104

95

32

5.5

34.3

31.5

7

222

(n-1)*35+63

243

G1/2

68

67

112

38

50