Class 2500 Flanges

Dimensions of Class 2500 Flanges (ANSI B 16.5) in mm

Nominal Pipe size

Flange Dia 'O'

Dia of Bolt circle 'A'

Dia of Bolt Holes 'D'

No. of Holes

Thk of Flange 'C'

Diameter at Weld Bevel

Dia of Hub 'E'

Length through Hub

Bore 'B'

Dia of R/F R

Depth of Socket F

Length of Threading

L/J

Y

L/J

B

1/2

15

133.3

88.9

22.2

4

30.2

21.3

42.9

39.7

73.3

39.7

22.3

22.9

34.9

28.6

3/4

20

139.7

95.2

22.2

4

31.7

26.7

50.8

42.9

79.4

42.9

27.7

28.2

42.9

31.7

1

25

158.7

107.9

25.4

4

34.9

33.5

57.1

47.7

88.9

47.7

34.5

35

50.8

34.9

1 1/4

32

184.1

130.2

28.6

4

38.1

42.2

73

52.4

95.2

52.4

43.2

43.7

63.5

38.1

1 1/2

40

203.2

146.0

31.7

4

44.4

48.3

79.4

60.3

111.1

60.3

49.5

50

73.0

44.4

2

50

234.9

171.4

28.6

8

50.8

60.4

95.2

69.8

127

69.8

62

62.5

92.1

50.8

2 1/2

65

266.7

196.8

31.7

8

57.1

73.1

114.3

79.4

142.9

79.4

74.7

75.4

104.8

57.1

3

80

304.8

228.6

34.9

8

66.7

88.9

133.3

92.1

168.3

92.1

90.7

91.4

127.0

63.5

4

100

355.6

273.0

41.3

8

76.2

114.3

165.1

107.9

190.5

107.9

116.1

116.8

157.2

69.8

5

125

419.1

323.8

47.6

8

92.1

141.2

203.2

130.0

128.6

130.0

143.8

144.5

185.7

76.2

6

150

482.6

368.3

54

8

107.9

168.4

234.9

152.4

273

152.4

170.7

171.4

215.9

82.5

8

200

552.4

438.1

54

12

127

219.2

304.8

177.8

317.5

177.8

221.5

222.2

269.9

95.2

10

250

673.1

539.7

66.7

12

165.1

273

374.6

228.6

419.1

228.6

276.3

277.4

323.8

107.9

12

300

762.0

619.1

73.0

12

184.1

323.8

441.3

254

463.5

254.0

327.1

328.2

381.0

120.6