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Stainless Steel Flanges
SORF Flange

SORF Flange

Slip-on-Raised-Face-Flange-SORF-Flange

Slip-on (SO) Flanges are preferred by some contractors, over the
Weld-neck, because of the lower initial cost. However, this may be offset by
the added cost of the two fillet welds required for proper installation. The
strength of the slip-on flange is ample for it’s rating, but its life under
fatigue conditions is considered to be only one-third that of the weld-neck
flange.

The slip-on flange may be attached to the end of a piece of pipe or to one
or more ends of a pipefitting. The slip-on flange is positioned so the inserted
end of the pipe or fitting is set back or short of the flange face by the
thickness of the pipe wall plus 1/8 of an inch. This allows for a fillet weld
inside the SO flange equal to the thickness of the pipe without doing any
damage to the flange face. The back or outside of the flange is also welded
with a fillet weld.

A variation of the Slip-on flange also exists. This is the Slip-on
Reducing Flange. This is simply a larger (say a 14″) Slip-on flange blank that,
instead of the Center (pipe) hole being cut out (or drilled out) for 14″ pipe
it is cut out for a 6″ pipe. The SO Reducing flange is basically used for
reducing the line size where space limitations will not allow the length of a
weld neck flange and reducer combination. The use of the Slip-on Reducing
Flange should only be used where the flow direction is from the smaller size
into the larger size.

These Flanges are available in the following range.

Stainless Steel: ASTM A182 F304, F304L, F304H, F316, F316L, F316Ti, F310, F310S, F321, F321H, F317, F347,
F347H, F904L.
Duplex Stainless Steel: UNS S31803, UNS S32750
Carbon
Steel:
 ASTM A105,
Alloy Steel: ASTM A182 F1,
F11, F22, F5, F9, F91
Nickel Alloys: Monel 400 & 500, Inconel 600 & 625, Incoloy
800, 825, Hastelloy C22, C276
Copper Alloys: Copper, Brass & Gunmetal
Size: 1/8″ NB To 48″NB and also Custom Specific.
Class: 150#, 300#, 400#, 600#, 900#, 1500#, 2500#.
Dimensional Standard ANSI: ANSI B16.5, ANSI B16.47, MSS SP44, ANSI
B16.36, ANSI B16.48
DIN: DIN2527, DIN2566, DIN2573, DIN2576, DIN2641, DIN2642, DIN2655,
DIN2656, DIN2627, DIN2628, DIN2629, DIN 2631, DIN2632, DIN2633, DIN2634, DIN2635,
DIN2636, DIN2637, DIN2638, DIN2673
B.S: BS 4504, BS4504, BS1560, BS10

DIMENSIONS of CLASS 150 FLANGES AS PER ANSI B 16.5

NB

A

D

B

G

K

E

H

L

No.of Holes

½”

15

30.2

88.9

11.1

34.9

60.3

22.3

15.9

15.9

4

¾”

20

38.1

98.4

12.7

42.9

69.8

27.7

15.9

15.9

4

1”

25

49.2

107.9

14.3

50.8

79.4

34.5

17.5

15.9

4

1 ¼”

32

58.7

117.5

15.9

63.5

88.9

43.2

20.6

15.9

4

1 ½”

40

65.1

127.0

17.5

73.0

98.4

49.5

22.2

15.9

4

2”

50

77.8

152.4

19.0

92.1

120.6

62.0

25.4

19.0

4

2 ½”

65

90.5

177.8

22.2

104.8

139.7

74.7

28.6

19.0

4

3”

80

107.9

190.5

23.8

127.0

152.4

90.7

30.2

19.0

4

4”

100

134.9

230.0

23.8

157.2

190.5

116.1

33.3

19.0

8

5”

125

163.5

254.0

23.8

185.7

215.9

143.8

36.5

22.2

8

6”

150

192.1

279.4

25.4

215.9

241.3

170.7

39.7

22.2

8

8”

200

246.1

342.9

28.6

269.9

298.4

221.5

44.4

22.2

8

10”

250

304.8

406.4

30.2

323.8

361.9

276.3

49.2

25.4

12

12”

300

365.1

482.6

31.8

381.0

431.8

327.1

55.6

25.4

12

14”

350

400.0

533.4

34.9

412.7

476.2

359.1

57.1

28.6

12

16”

400

457.2

596.9

36.5

469.9

539.7

410.5

63.5

28.6

16

18”

450

504.8

635.0

39.7

533.4

577.8

461.8

68.3

31.7

16

20”

500

558.8

698.5

42.9

584.2

635.0

513.1

73.0

31.7

20

24”

600

663.6

812.8

47.6

692.1

749.3

615.9

82.5

34.9

20

DIMENSIONS of CLASS 300 FLANGES AS PER ANSI B 16.5

NB

A

D

B

G

K

E

H

L

No. of Holes

½”

15

38.1

95.2

14.3

34.9

66.7

22.3

22.2

15.9

4

¾”

20

47.6

117.5

15.9

42.9

82.5

27.7

25.4

19.0

4

1”

25

54.0

123.8

17.5

50.8

88.9

34.5

27.0

19.0

4

1 ¼”

32

63.5

133.3

19.0

63.5

98.4

43.2

27.0

19.0

4

1 ½”

40

69.8

155.6

20.6

73.0

114.3

49.5

30.2

22.2

4

2”

50

84.1

165.1

22.2

92.1

127.0

62.0

33.3

19.0

8

2 ½”

65

100.0

190.5

25.4

104.8

149.2

74.7

38.1

22.2

8

3”

80

117.5

209.5

28.6

127.0

168.3

90.7

42.9

22.2

8

4”

100

146.0

254.0

31.8

157.2

200.0

116.1

47.6

22.2

8

5”

125

177.8

279.4

34.9

185.7

234.9

143.8

50.8

22.2

8

6”

150

206.4

317.5

36.5

215.9

269.9

170.7

52.4

22.2

12

8”

200

260.3

381.0

41.3

269.9

330.2

221.5

61.9

25.4

12

10”

250

320.7

444.5

47.6

323.8

387.3

276.3

66.7

28.6

16

12”

300

374.6

520.7

50.8

381.0

450.8

327.1

73.0

31.7

16

14”

350

425.4

584.2

54.0

412.7

514.3

359.1

76.2

31.7

20

16”

400

482.6

647.7

57.2

469.9

571.5

410.5

82.5

34.9

20

18”

450

533.4

711.2

60.3

533.4

628.5

461.8

88.9

34.9

24

20”

500

587.4

774.7

63.5

584.2

685.8

513.1

95.2

34.9

24

24”

600

701.7

914.4

69.8

692.1

812.8

615.9

106.4

41.3

24

 

DIMENSIONS of CLASS 600 FLANGES AS PER ANSI B 16.5

NB

A

D

B

G

K

E

H

L

No. of Holes

½”

15

38.1

95.2

14.3

34.9

66.7

22.3

22.2

15.9

4

¾”

20

47.6

117.5

15.9

42.9

82.5

27.7

25.4

19.0

4

1”

25

54.0

123.8

17.5

50.8

88.9

34.5

27.0

19.0

4

1 ¼”

32

63.5

133.3

20.6

63.5

98.4

43.2

28.6

19.0

4

1 ½”

40

69.8

155.6

22.2

73.0

114.3

49.5

31.7

22.2

4

2”

50

84.1

165.1

25.4

92.1

127.0

62.0

36.5

19.0

8

2 ½”

65

100.0

190.5

28.6

104.8

149.2

74.7

41.3

22.2

8

3”

80

117.5

209.5

31.8

127.0

168.3

90.7

46.0

22.2

8

4”

100

152.4

273.0

38.1

157.2

215.9

116.1

54.0

25.4

8

5”

125

188.9

330.2

44.4

185.7

266.7

143.8

60.3

28.6

8

6”

150

222.2

355.6

47.6

215.9

292.1

170.7

66.7

28.6

12

8”

200

273.0

419.1

55.6

269.9

349.2

221.5

76.2

31.7

12

10”

250

342.9

508.0

63.5

323.8

431.8

276.3

85.7

34.9

16

12”

300

400.0

558.8

66.7

381.0

488.9

327.1

92.1

34.9

20

14”

350

431.8

603.2

69.9

412.7

527.0

359.1

93.7

38.1

20

16”

400

495.3

685.8

75.2

469.9

603.2

410.5

106.4

41.3

20

18”

450

546.0

742.9

82.6

533.4

654.0

461.8

117.5

44.4

20

20”

500

609.6

812.8

88.9

584.2

723.9

513.1

127.0

44.4

24

24”

600

717.6

939.8

101.6

692.1

838.2

615.9

139.7

50.8

24

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