TO ALLSTAINLESS LIMITED STAINLESS STEEL SITE
ALL STAINLESS LIMITED flanges info section
21 Camford Way, Sundon Park Luton, Bedfordshire, LU3 3AN
Telephone: 01582 584075 Facsimile: 01582 585234
mailto:info@allstainlessltd.co.uk

ANSI FLANGES

We offer a complete range of ANSI flanges for use with nominal bore pipe in grades 304, 316 and 321 to 150, 300, 600 and 1500Lb ratings. Specials can be manufactured to customer’s special requirements. We also offer BS4504 and Table flanges. Please contact our sales department for further information.

weld neck flange
WELD NECK FLANGE
socket weld flange
SOCKET WELD FLANGE
screwed flange
SCREWED FLANGE
slip on boss flange
SLIP ON BOSS FLANGE
blind flange BLIND FLANGE

flanges

(The diagram shows the correct position but not necessarily the correct number of boltholes.)

ANSI B16.5 CLASS 150

N.B. SIZE

D

K

L

A

C

N

H1

H2

H3

H4

T

B1

B2

B3

R

R1

U

O

F

No. of Holes

Inches

mm

½"

15

89

60.3

15.9

21.3

11.1

30

15.9

47.6

15.9

Min 6.4mm

15.9

22.4

Schedule to be supplied by purchaser

23

3

3

9.5

34.9

1.6

4

¾"

20

98

69.8

15.9

26.7

12.7

38

15.9

52.4

15.9

15.9

27.7

28

3

3

11

42.9

1.6

4

1"

25

108

79.4

15.9

33.4

14.3

49

17.5

55.6

17.5

17.5

34.5

35

3

3

12.5

50.8

1.6

4

1 ¼"

32

117

88.9

15.9

42.2

15.9

59

20.6

57.2

20.6

20.6

43.2

43.5

3

5

14.5

63.5

1.6

4

1 ½"

40

127

98.4

15.9

48.3

17.5

65

22.2

61.9

22.2

22.2

49.5

50

3

6.5

16

73

1.6

4

2"

50

152

120.6

19

60.3

19

78

25.4

63.5

25.4

25.4

62

52.5

3

8

17.5

92.1

1.6

4

2 ½"

65

178

139.7

19

73

22.2

90

28.6

69.9

28.6

28.6

74.7

75.5

3

8

19

104.8

1.6

4

3"

80

190

152.4

19

88.9

23.8

108

30.2

69.9

30.2

30.2

90.7

91.5

3

9.5

20.5

127

1.6

4

3 ½"

88

215.9

177.8

19

101.6

23.8

122

31.8

71.4

31.8

31.8

103.4

104.1

3

9.7

139.7

1.6

8

4"

100

229

190.5

19

114.3

23.8

135

33.3

76.2

33.3

33.3

116.1

117

3

11

157.2

1.6

8

5"

125

254

215.9

22.2

141.3

23.8

164

36.5

88.9

36.5

36.5

143.8

145

6.5

11

185.7

1.6

8

6"

150

279

241.3

22.2

168.3

25.4

192

39.7

88.9

39.7

39.7

170.7

171

6.5

12.5

215.9

1.6

8

8"

200

343

298.4

22.2

219.1

28.6

246

44.5

101.6

44.5

221.5

222

6.5

12.5

269.9

1.6

8

10"

250

406

362

25.4

273

30.2

305

49.2

101.6

49.2

276.4

277

6.5

12.5

323.8

1.6

12

12"

300

483

431.8

25.4

323.9

31.8

365

55.6

114.3

55.6

327.2

328

6.5

12.5

381

1.6

12

14"

350

533

476.2

28.6

355.6

34.9

400

57.2

127

79.4

359.2

360

6.5

12.5

412.7

1.6

12

16"

400

597

539.8

28.6

406.4

36.5

457

63.5

127

87.3

410.5

411

6.5

12.5

469.9

1.6

16

18"

450

635

577.8

31.8

457.2

39.7

505

68.3

139.7

96.8

461.8

462

6.5

12.5

533.4

1.6

16

20"

500

698

635

31.8

508

42.9

559

73

144.5

103.2

513.1

514

6.5

12.5

584.2

1.6

20

24"

600

813

749.3

34.9

609.6

47.6

664

82.6

152.4

111.1

616

616

6.5

12.5

692.1

1.6

20

ANSI B16.5 CLASS 300

N.B. SIZE

D

K

L

A

C

N

H1

H2

H3

H4

T

B1

B2

B3

R

R1

U

O

F

No. of Holes

Inches

mm

½"

15

95

66.7

15.9

21.3

14.3

38

22.2

52.4

22.2

Min 6.4mm

16

22.4

Schedule to be supplied by purchaser

23

3

3

9.5

34.9

1.6

4

¾"

20

117

82.6

19.0

26.7

15.9

48

25.4

57.2

25.4

16

27.7

28

3

3

11

42.9

1.6

4

1"

25

124

88.9

19.0

33.4

17.5

54

27.0

61.9

27.0

17

34.5

35

3

3

12.5

50.8

1.6

4

1 ¼"

32

133

98.4

19.0

42.2

19.0

64

27.0

65.1

27.0

21

43.2

43.5

3

5

14.5

63.5

1.6

4

1 ½"

40

156

114.3

22.2

48.3

20.6

70

30.2

68.3

30.2

22

49.5

50

3

6.5

16

73.0

1.6

4

2"

50

165

127.0

19.0

60.3

22.2

84

33.3

69.9

33.3

29

62.0

62.5

3

8

17.5

92.1

1.6

8

2 ½"

65

190

149.2

22.2

73.0

25.4

100

38.1

76.2

38.1

32

74.7

75.5

3

8

19

104.8

1.6

8

3"

80

210

168.3

22.2

88.9

28.6

117

42.9

79.4

42.9

32

90.7

91.5

3

9.5

20.5

127.0

1.6

8

3 ½"

88

228.6

184.2

22.4

101.6

30.2

133.4

44.5

81.0

44.5

36.6

103.4

104.1

3

9.7

-

139.7

1.6

8

4"

100

254

200.0

22.2

114.3

31.8

146

47.6

85.7

47.6

37

116.1

117

3

9.5

-

157.2

1.6

8

5"

125

279

235.0

22.2

141.3

34.9

178

50.8

98.4

50.8

43

143.8

145

6.5

11

-

185.7

1.6

8

6"

150

318

269.9

22.2

168.3

36.5

206

52.4

98.4

52.4

46

170.7

171

6.5

12.5

-

215.9

1.6

12

8"

200

381

330.2

25.4

219.1

41.3

260

61.9

111.1

61.9

-

221.5

222

6.5

12.5

-

269.9

1.6

12

10"

250

444

387.4

28.6

273.0

47.6

321

66.8

117.5

95.3

-

276.4

277

6.5

12.5

-

323.8

1.6

16

12"

300

521

450.8

31.8

323.9

50.8

375

73.0

130.2

101.6

-

327.2

328

9.5

12.5

-

381.0

1.6

16

14"

350

584

514.4

31.8

355.6

54.0

425

76.2

142.9

111.1

-

359.2

360

9.5

12.5

-

412.7

1.6

20

16"

400

648

571.5

34.9

406.4

57.2

483

82.6

146.1

120.7

-

410.5

411

9.5

12.5

-

469.9

1.6

20

18"

450

711

628.6

34.9

457.2

60.3

533

88.9

158.8

130.2

-

461.8

462

9.5

12.5

-

533.4

1.6

24

20"

500

775

685.8

34.9

508.0

63.5

587

95.3

162.0

139.7

-

513.1

514

9.5

12.5

-

584.2

1.6

24

24"

600

914

812.8

41.3

609.6

69.8

702

106.4

168.3

152.4

-

616.0

616

9.5

12.5

-

692.1

1.6

24

ANSI B16.5 CLASS 600

N.B. SIZE

D

K

L

A

C

N

H1

H2

H3

H4

T

B1

B2

B3

R

R1

U

O

F

No. of Holes

Inches

mm

½"

15

95

66.7

15.9

21.3

14.3

38.

22.2

52.4

22.2

Min 6.4mm

16

22.4

Schedule to be supplied by purchaser

23

3

3

9.5

34.9

6.4

4

¾"

20

117

82.6

19

26.7

15.9

48

25.4

57.2

25.4

16

27.7

82

3

3

11

42.9

6.4

4

1"

25

124

88.9

19

33.4

17.5

54

27.0

61.9

27.0

17

34.5

38

3

3

12.5

50.8

6.4

4

1 ¼"

32

13

98.4

19

42.2

20.6

64

28.6

66.8

28.6

21

43.2

43.5

3

5

14.5

63.5

6.4

4

1 ½"

40

156

114.3

22.2

48.3

22.2

70

31.8

69.9

31.8

22

49.5

50

3

6.5

16

73.0

6.4

4

2"

50

165

127.0

19

60.3

25.4

84

36.5

73.0

36.5

29

62.0

62.5

3

8

17.5

92.1

6.4

8

2 ½"

65

190

149.2

22.2

73.0

28.6

100

41.3

79.4

41.3

32

74.7

75.5

3

8

19

104.8

6.4

8

3"

80

210

168.3

22.2

88.9

31.8

117

46.0

82.6

46.0

35

90.7

91.5

3

9.5

20.5

127.0

6.4

8

3 ½"

88

228.6

184.2

25.4

101.6

35.0

133.4

49.3

85.9

49.3

39.6

103.4

104.1

3

9.5

-

139.7

6.4

8

4"

100

273

215.9

25.4

114.3

38.1

152

54.0

101.6

54.0

41

116.1

117

3

11

-

157.2

6.4

8

5"

125

330

266.7

28.6

141.3

44.4

189

60.3

114.3

60.3

48

143.8

145

6.5

11

-

185.7

6.4

8

6"

150

356

292.1

28.6

168.3

47.6

222

66.8

117.5

66.8

51

170.7

171

6.5

12.5

-

215.9

6.4

12

8"

200

419

349.2

31.8

219.1

55.6

273

76.2

133.4

76.2

-

221.5

222

6.5

12.5

-

269.9

6.4

12

10"

250

508

431.8

34.9

273.0

63.5

343

85.7

152.4

111.1

-

276.4

277

6.5

12.5

-

323.8

6.4

16

12"

300

559

489.0

34.9

323.9

66.7

400

92.1

155.6

117.5

-

327.2

328

11

12.5

-

381.0

6.4

20

14"

350

603

527.0

38.1

355.6

69.8

432

93.7

165.1

127.0

-

359.2

360

11

12.5

-

412.7

6.4

20

16"

400

686

603.2

41.3

406.4

76.2

495

106.4

177.8

139.7

-

410.5

411

11

12.5

-

469.9

6.4

20

18"

450

743

654.0

44.4

457.2

82.6

546

117.5

187.2

151.4

-

461.8

462

11

12.5

-

533.4

6.4

20

20"

500

813

723.9

44.4

508.0

88.9

610

127.0

190.5

165.1

-

513.1

514

11

12.5

-

584.2

6.4

24

24"

600

940

838.2

50.8

609.6

101.6

718

139.7

203.2

184.2

-

616.0

616

11

12.5

-

692.1

6.4

24

ANSI B16.5 CLASS 900

N.B. SIZE

D

K

L

A

C

N

H1

H2

H3

H4

T

B1

B2

B3

R

R1

O

F

No. of Holes

Inches

mm

3"

80

241

190.5

25.4

88.9

38.1

127

54.0

101.6

54.0

Min 6.4mm

41

90.7

Schedule to be supplied by purchaser

91.5

3.0

9.5

127.0

6.4

8

4"

100

292

235.0

31.8

114.3

44.4

159

69.9

114.3

69.9

48

116.1

117.0

5.0

11.0

157.2

6.4

8

5"

125

349

279.4

34.9

141.3

50.8

190

79.4

127.0

79.4

54

143.8

145.0

6.5

11.0

185.7

6.4

8

6"

150

381

317.5

31.8

168.3

55.6

235

85.7

139.7

85.7

57

170.7

171.0

6.5

12.5

215.9

6.4

12

8"

200

470

393.7

38.1

219.1

63.5

298

101.6

162.0

114.3

-

221.5

222.0

6.5

12.5

269.9

6.4

12

10"

250

546

469.9

38.1

273.0

69.8

368

108.0

184.2

127.0

-

276.4

277.0

6.5

12.5

323.8

6.4

16

12"

300

610

533.4

38.1

323.9

79.4

419

117.5

200.0

142.9

-

327.2

328.0

9.5

12.5

381.0

6.4

20

14"

350

641

558.8

41.3

355.6

85.7

451

130.2

212.8

155.6

-

359.2

360.0

11.0

12.5

412.7

6.4

20

16"

400

705

616.0

44.4

406.4

88.9

508

133.4

215.9

165.1

-

410.5

411.0

11.0

12.5

469.9

6.4

20

18"

450

787

685.8

50.8

457.2

101.6

565

152.4

228.6

190.5

-

461.8

462.0

11.0

12.5

533.4

6.4

20

20"

500

857

749.3

54.0

508.0

108.0

622

158.8

247.7

209.6

-

513.1

514.0

11.0

12.5

584.2

6.4

20

24"

600

1041

901.7

66.7

609.6

139.7

749

203.2

292.1

266.7

-

616.0

616.0

11.0

12.5

692.1

6.4

20

ANSI B16.5 CLASS 1500

N.B. SIZE

D

K

L

A

C

N

H1

H2

H3

H4

T

B1

B2

B3

R

R1

U

O

F

No. of Holes

Inches

mm

½"

15

121

82.6

22.2

21.3

22.2

38

31.8

60.3

31.8

Min 6.4mm

22

22.4

Schedule to be supplied by purchaser

23

5

3

9.5

34.9

6.4

4

¾"

20

130

88.9

22.2

26.7

25.4

44

34.9

69.9

34.9

25

27.7

28

5

3

11

42.9

6.4

4

1"

25

149

101.6

25.4

33.4

28.6

52

41.3

73.0

41.3

29

34.5

35

5

3

12.5

50.8

6.4

4

1 ¼"

32

159

111.1

25.4

42.2

28.6

64

41.3

73.0

41.3

30

43.2

43.5

5

5

14.5

63.5

6.4

4

1 ½"

40

178

123.8

28.6

48.3

31.8

70

44.5

82.6

44.5

32

49.5

50

5

6.5

16

73.0

6.4

4

2"

50

216

165.1

25.4

60.3

38.1

105

57.2

101.6

57.2

38

62.0

52.5

5

8

17.5

92.1

6.4

8

2 ½"

65

244

190.5

28.6

73.0

41.3

124

63.5

104.8

63.5

48

74.7

75.5

5

8

19

104.8

6.4

8

3"

80

267

203.2

31.8

88.9

47.6

133

73.0

117.5

73.0

51

90.7

91.5

5

9.5

-

127.0

6.4

8

4"

100

311

241.3

34.9

114.3

54.0

162

90.5

123.8

90.5

57

116.1

117

5

11

-

157.2

6.4

8

5"

125

375

292.1

41.3

141.3

73.0

197

104.8

155.6

104.8

64

143.8

145

6.5

11

-

185.7

6.4

12

6"

150

394

317.5

38.1

168.3

82.6

229

119.1

171.5

119.1

70

170.7

171

6.5

12.5

-

215.9

6.4

12

8"

200

483

393.7

44.4

219.1

92.1

292

142.9

212.7

142.9

-

221.5

222

6.5

12.5

-

269.9

6.4

12

10"

250

584

482.6

50.8

273.0

108.0

368

158.8

254.0

177.8

-

276.4

277

9.5

12.5

-

323.8

6.4

16

12"

300

673

571.5

54.0

323.9

123.8

451

181.0

282.6

219.1

-

327.2

328

11

12.5

-

381.0

6.4

16

14"

350

749

635.0

60.3

355.6

133.4

495

-

298.5

241.3

-

359.2

360

11

12.5

-

412.7

6.4

16

16"

400

826

704.8

66.7

406.4

146.1

552

-

311.2

260.4

-

410.5

411

11

12.5

-

469.9

6.4

16

18"

450

914

774.7

73.0

457.2

161.9

597

-

327.0

276.2

-

461.8

462

11

12.5

-

533.4

6.4

16

20"

500

984

831.8

79.4

508.0

178.0

641

-

355.6

292.1

-

513.1

514

11

12.5

-

584.2

6.4

16

24"

600

1168

990.6

92.4

609.6

203.0

762

-

406.4

330.2

-

616.0

616

11

12.5

-

692.1

6.4

16

 

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Page last updated 15th June 2004