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ANSI Flanges-Blind Flanges, BL Flange, BLRF


ASME/ANSI B16.5 Class 150 BL

Nominal Pipe Size 

Outside Diameter of Flange

Diameter of Raised Face

Thickness of Flanges Min.

Diameter of Bolt Circle

Diameter of Bolt Holes

Number of Bolts

Approximate Weight kgs

NPS

O

R

tf

W

I

n


1/2

90

34.9

9.6

60.3

15.9

4

0.44

3/4

100

42.9

11.2

69.9

15.9

4

0.64

1

110

50.8

12.7

79.4

15.9

4

0.90

1 1/4

115

63.5

14.3

88.9

15.9

4

1.13

1 1/2

125

73.0

15.9

98.4

15.9

4

1.50

2

150

92.1

17.5

120.7

19.1

4

2.38

2 1/2

180

104.8

20.7

139.7

19.1

4

4.09

3

190

127.0

22.3

152.4

19.1

4

4.97

3 1/2

215

139.7

22.3

177.8

19.1

8

6.20

4

230

157.2

22.3

190.5

19.1

8

7.18

5

255

185.7

22.3

215.9

22.2

8

8.83

6

280

215.9

23.9

241.3

22.2

8

11.55

8

345

269.9

27.0

298.5

22.2

8

20.07

10

405

323.8

28.6

362.0

25.4

12

28.87

12

485

381.0

30.2

431.8

25.4

12

44.18

14

535

412.8

33.4

476.3

28.6

12

59.07

16

595

469.9

35.0

539.8

28.6

16

76.36

18

635

533.4

38.1

577.9

31.8

16

94.51

20

700

584.2

41.3

635.0

31.8

20

123.94

24

815

692.2

46.1

749.3

34.9

20

187.90


ASME/ANSI B16.5 Class 300 BL

Nominal Pipe Size 

Outside Diameter of Flange

Diameter of Raised Face

Thickness of Flanges Min.

Diameter of Bolt Circle

Diameter of Bolt Holes

Number of Bolts

Approximate Weight kgs

NPS

O

R

tf

W

I

n


1/2

95

34.9

12.7

66.7

15.9

4

0.64

3/4

115

42.9

14.3

82.6

19.1

4

1.06

1

125

50.8

15.9

88.9

19.1

4

1.42

1 1/4

135

63.5

17.5

98.4

19.1

4

1.86

1 1/2

155

73.0

19.1

114.3

22.2

4

2.66

2

165

92.1

20.7

127.0

19.1

8

3.21

2 1/2

190

104.8

23.9

149.2

22.2

8

4.88

3

210

127.0

27.0

168.3

22.2

8

6.89

3 1/2

230

139.7

28.6

184.2

22.2

8

8.88

4

255

157.2

30.2

200.0

22.2

8

11.68

5

280

185.7

33.4

235.0

22.2

8

15.77

6

320

215.9

35.0

269.9

22.2

12

21.41

8

380

269.9

39.7

330.2

25.4

12

34.37

10

445

323.8

46.1

387.4

28.6

16

53.90

12

520

381.0

49.3

450.8

31.8

16

79.14

14

585

412.8

52.4

514.4

31.8

20

106.23

16

650

469.9

55.6

571.5

34.9

20

139.30

18

710

533.4

58.8

628.6

34.9

24

175.78

20

775

584.2

62.0

685.8

34.9

24

222.78

24

915

692.2

68.3

812.8

41.3

24

341.50


ASME/ANSI B16.5 Class 600 BL

Nominal Pipe Size 

Outside Diameter of Flange

Diameter of Raised Face

Thickness of Flanges Min.

Diameter of Bolt Circle

Diameter of Bolt Holes

Number of Bolts

Approximate Weight kgs

NPS

O

R

tf

W

I

n


1/2

95

34.9

14.3

66.7

15.9

4

0.76

3/4

115

42.9

15.9

82.6

19.1

4

1.23

1

125

50.8

17.5

88.9

19.1

4

1.64

1 1/4

135

63.5

20.7

98.4

19.1

4

2.32

1 1/2

155

73.0

22.3

114.3

22.2

4

3.26

2

165

92.1

25.4

127.0

19.1

8

4.18

2 1/2

190

104.8

28.6

149.2

22.2

8

6.15

3

210

127.0

31.8

168.3

22.2

8

8.57

3 1/2

230

139.7

35.0

184.2

25.4

8

11.15

4

275

157.2

38.1

215.9

25.4

8

17.63

5

330

185.7

44.5

266.7

28.6

8

29.60

6

355

215.9

47.7

292.1

28.6

12

36.22

8

420

269.9

55.6

349.2

31.8

12

59.51

10

510

323.8

63.5

431.8

34.9

16

98.79

12

560

381.0

66.7

489.0

34.9

20

125.29

14

605

412.8

69.9

527.0

38.1

20

152.70

16

685

469.9

76.2

603.2

41.3

20

214.13

18

745

533.4

82.6

654.0

44.5

20

275.01

20

815

584.2

88.9

723.9

44.5

24

353.07

24

940

692.2

101.6

838.2

50.8

24

535.77


ASME/ANSI B16.5 Class 900 BL

Nominal Pipe Size 

Outside Diameter of Flange

Diameter of Raised Face

Thickness of Flanges Min.

Diameter of Bolt Circle

Diameter of Bolt Holes

Number of Bolts

Approximate Weight kgs

NPS

O

R

tf

W

I

n


1/2

120

34.9

22.3

82.6

22.2

4

1.76

3/4

130

42.9

25.4

88.9

22.2

4

2.42

1

150

50.8

28.6

101.6

25.4

4

3.63

1 1/4

160

63.5

28.6

111.1

25.4

4

4.24

1 1/2

180

73.0

31.8

123.8

28.6

4

5.95

2

215

92.1

38.1

165.1

25.4

8

10.02

2 1/2

245

104.8

41.3

190.5

28.6

8

14.11

3

240

127.0

38.1

190.5

25.4

8

13.02

4

290

157.2

44.5

235.0

31.8

8

21.94

5

350

185.7

50.8

279.4

34.9

8

36.83

6

380

215.9

55.6

317.5

31.8

12

47.40

8

470

269.9

63.5

393.7

38.1

12

82.87

10

545

323.8

69.9

469.9

38.1

16

122.61

12

610

381.0

79.4

533.4

38.1

20

174.34

14

640

412.8

85.8

558.8

41.3

20

206.16

16

705

469.9

88.9

616.0

44.5

20

260.49

18

785

533.4

101.6

685.8

50.8

20

366.23

20

855

584.2

108.0

749.3

54.0

20

463.04

24

1040

692.2

139.7

901.7

66.7

20

876.34


ASME/ANSI B16.5 Class 1500 BL

Nominal Pipe Size 

Outside Diameter of Flange

Diameter of Raised Face

Thickness of Flanges Min.

Diameter of Bolt Circle

Diameter of Bolt Holes

Number of Bolts

Approximate Weight kgs

NPS

O

R

tf

W

I

n


1/2

120

34.9

22.3

82.6

22.2

4

1.76

3/4

130

42.9

25.4

88.9

22.2

4

2.42

1

150

50.8

28.6

101.6

25.4

4

3.63

1 1/4

160

63.5

28.6

111.1

25.4

4

4.24

1 1/2

180

73.0

31.8

123.8

28.6

4

5.95

2

215

92.1

38.1

165.1

25.4

8

10.02

2 1/2

245

104.8

41.3

190.5

28.6

8

14.11

3

265

127.0

47.7

203.2

31.8

8

18.99

4

310

157.2

54.0

241.3

34.9

8

29.83

5

375

185.7

73.1

292.1

41.3

8

58.77

6

395

215.9

82.6

317.5

38.1

12

72.65

8

485

269.9

92.1

393.7

44.5

12

123.34

10

585

323.8

108.0

482.6

50.8

12

211.94

12

675

381.0

123.9

571.5

54.0

16

318.94

14

750

412.8

133.4

635.0

60.3

16

422.42

16

825

469.9

146.1

704.8

66.7

16

558.96

18

915

533.4

162.0

774.7

73.0

16

763.84

20

985

584.2

177.8

831.8

79.4

16

968.52

24

1170

692.2

203.2

990.6

92.1

16

1566.88


ASME/ANSI B16.5 Class 2500 BL

Nominal Pipe Size 

Outside Diameter of Flange

Diameter of Raised Face

Thickness of Flanges Min.

Diameter of Bolt Circle

Diameter of Bolt Holes

Number of Bolts

Approximate Weight kgs

NPS

O

R

tf

W

I

n


1/2

135

34.9

30.2

88.9

22.2

4

3.08

3/4

140

42.9

31.8

95.2

22.2

4

3.54

1

160

50.8

35.0

108.0

25.4

4

5.08

1 1/4

185

63.5

38.1

130.2

28.6

4

7.45

1 1/2

205

73.0

44.5

146.0

31.8

4

10.66

2

235

92.1

50.9

171.4

28.6

8

15.66

2 1/2

265

104.8

57.2

196.8

31.8

8

22.41

3

305

127.0

66.7

228.6

34.9

8

34.96

4

355

157.2

76.2

273.0

41.3

8

53.91

5

420

185.7

92.1

323.8

47.6

8

91.42

6

485

215.9

108.0

368.3

54.0

8

143.23

8

550

269.9

127.0

438.2

54.0

12

212.79

10

675

323.8

165.1

539.8

66.7

12

414.32

12

760

381.0

184.2

619.1

73.0

12

589.99



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