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Class 900 Weld Neck Flange Dimensions
- May 21, 2018 -

Class 900 weld neck flange dimensions

Weld neck flange dimensions are covered in ASME B16.5 – which covers Pipe Flanges and Flanged Fittings for size NPS ½” to 24” for above NPS 26” to 60” it should be as per ASME B16.47.

Class 900 weld neck flange dimensions.jpg

During dimensional inspection of flange, you should check for:
1)Outer & Inner Diameter of body
2)Bolt Circle & Bolt hole Diameter
3)the thickness of weld end
4)Length of the Hub and
5)Straightness and alignment of the bolt hole
Class 900 Weld Neck Flange Dimensions

Size in Inch

Size in mm

Outer Diameter

Flange Thickness

Hub OD

Weld Neck OD

Welding Neck Length

Bore

RF Diameter

RF Height

PCD

Weld Face



A

B

C

D

E

F

G

H

I

J

1/2

15

120

22.3

38

21.3

60

Refer Note

34.9

7

82.6

1.6

3/4

20

130

25.4

44

26.7

70

42.9

7

88.9

1.6

1

25

150

28.6

52

33.4

73

50.8

7

101.6

1.6

1 1/4

32

160

28.6

64

42.2

73

63.5

7

111.1

1.6

1 1/2

40

180

31.8

70

48.3

83

73

7

123.8

1.6

2

50

215

38.1

105

60.3

102

92.1

7

165.1

1.6

2 1/2

65

245

41.3

124

73

105

104.8

7

190.5

1.6

3

80

240

38.1

127

88.9

102

127

7

190.5

1.6

4

100

290

44.5

159

114.3

114

157.2

7

235

1.6

5

125

350

50.8

190

141.3

127

185.7

7

279.4

1.6

6

150

380

55.6

235

168.3

140

215.9

7

317.5

1.6

8

200

470

63.5

298

219.1

162

269.9

7

393.7

1.6

10

250

545

69.9

368

273

184

323.8

7

469.9

1.6

12

300

610

79.4

419

323.8

200

381

7

533.4

1.6

14

350

640

85.8

451

355.6

213

412.8

7

558.8

1.6

16

400

705

88.9

508

406.4

216

469.9

7

616

1.6

18

450

785

101.6

565

457

229

533.4

7

685.8

1.6

20

500

855

108

622

508

248

584.2

7

749.3

1.6

24

600

1040

139.7

749

610

292

692.2

7

901.7

1.6