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Blind Flange


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A Blind flange is round plate which has all of the relevant boltholes but no center hole, and because of this feature this flange is used to close off the ends of a piping systems and pressure vessel openings. It also permits easy access to the interior of a line or vessel once it has been sealed and must be reopened.

From the standpoint of internal pressure and bolt loading, blind flanges, particularly in the larger sizes, are the most highly stressed flange types.

However, most of these stresses are bending types near the center, and since there is no standard inside diameter, these flanges are suitable for higher pressure temperature applications.

Blind Flanges are commonly used in petrochemical, pipe engineering, public services & water works.



Flange Type

Slip-On; Welding Neck, Socket Welding, Blind, Thread, Lap-joint; Long Welding Neck; Orifice; All flanges in Raised Face, Flat face and RTJ;

Material

ASTM A105; A350 LF2; A694 F42, F46, F52, F56,
A182 F12/F22/F5/F9/ F91;
A182 F304/F304L/F316/F316L, etc.

Size

1/2”~60”, as the clients’ requests;

Pressure

Class: 150 300 400 600 900 1500 2500; PN6,PN10,PN16,PN25,PN40;5K,10K,16K,20K,30K

Standard

ASME B16.5, ASME B16.47, MSS SP43, EN1092DIN, JIS;




Class 150 lb
Pipe Flange Data Raised Face Drilling Data Unit Weight
Nominal
Pipe Size
A C G H I J
Outside
Diameter
Overall
Diameter
Flange
Thickness
min
Face
Diameter
Number
of  Holes
Bolt Hole
Diameter
Diameter
of Circle
of Holes
kg/
piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
1/2 0.840
21.30
3.500
88.90
0.440
11.20
1.380
35.10
4 0.620 15.70 2.380 60.45 0.42
3/4 1.050
26.70
3.880
98.60
0.500
12.70
1.690
42.90
4 0.620 15.70 2.750 69.85 0.61
1 1.315
33.40
4.250
108.0
0.560
14.20
2.000
50.80
4 0.620 15.70 3.120 79.25 0.86
1 1/4 1.660
42.20
4.620
117.3
0.620
15.70
2.500
63.50
4 0.620 15.70 3.500 88.90 1.17
1 1/2 1.900
48.30
5.000
127.0
0.690
17.50
2.880
73.15
4 0.620 15.70 3.880 98.60 1.53
2 2.375
60.30
6.000
152.4
0.750
19.10
3.620
91.90
4 0.750 19.10 4.750 120.7 2.42
2 1/2 2.875
73.00
7.000
177.8
0.880
22.40
4.120
104.6
4 0.750 19.10 5.500 139.7 3.94
3 3.500
88.90
7.500
190.5
0.940
23.90
5.000
127.0
4 0.750 19.10 6.000 152.4 4.93
31/2 4.000
101.6
8.500
215.9
0.940
23.90
5.500
139.7
8 0.750 19.10 7.000 177.8 6.17
4 4.500
114.3
9.000
228.6
0.940
23.90
6.190
157.2
8 0.750 19.10 7.500 190.5 7
5 5.563
141.3
10.00
254.0
0.940
23.90
7.310
185.7
8 0.880 22.40 8.500 215.9 8.63
6 6.625
168.3
11.00
279.4
1.000
25.40
8.500
215.9
8 0.880 22.40 9.500 241.3 11.3
8 8.625
219.1
13.50
342.9
1.120
28.40
10.62
269.7
8 0.880 22.40 298.5 11.75 19.6
10 10.75
273.0
16.00
406.4
1.190
30.20
12.75
323.9
12 1.000 25.40 14.25 362.0 28.8
12 12.75
323.8
19.00
482.6
1.250
31.75
15.00
381.0
12 1.000 25.40 17.00 431.8 43.2
14 14.00
355.6
21.00
533.4
1.380
35.10
16.25
412.8
12 1.120 28.40 18.75 476.3 58.1
16 16.00
406.4
23.50
596.9
1.440
36.60
18.50
469.9
16 1.120 28.40 21.25 539.8 76
18 18.00
457.2
25.00
635.0
1.560
39.60
21.00
533.4
16 1.250 31.75 22.75 577.9 93.7
20 20.00
508.0
27.50
698.5
1.690
42.90
23.00
584.2
20 1.250 31.75 25.00 635.0 122
24 24.00
609.6
32.00
812.8
1.880
47.80
27.25
692.2
20 1.380 35.10 29.50 749.3 185

Class 300 lb
Pipe Flange Data Raised Face Drilling Data Unit Weight
Nominal
Pipe Size
A C G H I J
Outside
Diameter
Overall
Diameter
Flange
Thickness
min
Face
Diameter
Number
of  Holes
Bolt Hole
Diameter
Diameter
of Circle
of Holes
kg/
piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
1/2 0.840
21.30
3.750
95.20
0.560
14.20
1.380
35.10
4 0.620 15.70 2.620 66.55 0.64
3/4 1.050
26.70
4.620
117.3
0.620
15.70
1.690
42.90
4 0.750 19.00 3.250 82.50 1.11
1 1.315
33.40
4.880
123.9
0.690
17.50
2.000
50.80
4 0.750 19.00 3.500 88.90 1.39
1 1/4 1.660
42.20
5.250
133.3
0.750
19.00
2.500
63.50
4 0.750 19.00 3.880 98.50 1.79
1 1/2 1.900
48.30
6.120
155.4
0.810
20.60
2.880
73.15
4 0.880 22.3 4.500 114.3 2.66
2 2.375
60.30
6.500
165.1
0.880
22.30
3.620
91.90
8 0.750 19.10 5.000 127.0 3.18
2 1/2 2.875
73.00
7.500
190.5
1.000
25.40
4.120
104.6
8 0.880 22.30 5.880 1.493 4.85
3 3.500
88.90
8.250
209.5
1.120
28.40
5.000
127.0
8 0.880 22.30 6.620 168.1 6.81
31/2 4.000
101.6
9.000
228.6
1.190
30.20
5.500
139.7
8 0.880 22.30 7.250 184.1 8.71
4 4.500
114.3
10.00
254.0
1.250
31.70
6.190
157.2
8 0.880 22.30 7.800 200.1 11.5
5 5.563
141.3
11.00
279.4
1.380
35.00
7.310
185.7
8 0.880 22.30 9.250 234.9 15.6
6 6.625
168.3
12.50
317.5
1.440
36.50
8.500
215.9
12 0.880 22.30 10.62 269.7 20.9
8 8.625
219.1
15.00
381.0
1.620
41.10
10.62
269.7
12 1.000 25.40 13.00 330.2 34.3
10 10.75
273.0
17.50
444.5
1.880
47.70
12.75
323.9
16 1.120 28.40 15.25 387.3 53.3
12 12.75
323.8
20.50
520.7
2.000
50.80
15.00
381.0
16 1.250 31.70 17.75 450.8 78.8
14 14.00
355.6
23.00
584.2
2.120
53.80
16.25
412.8
20 1.250 31.70 20.25 514.3 105
16 16.00
406.4
25.50
647.7
2.250
57.15
18.50
469.9
20 1.380 35.00 22.50 571.5 137
18 18.00
457.2
28.00
711.2
2.380
60.45
21.00
533.4
24 1.380 35.00 24.75 628.6 175
20 20.00
508.0
30.50
774.7
2.500
63.50
23.00
584.2
24 1.380 35.00 27.00 685.8 221
24 24.00
609.6
36.00
914.4
2.750
69.85
27.25
692.2
24 1.620 41.10 32.00 812.8 339

Notes
- Weights are based on manufacturer’s data and are approximate.
- Flat face flanges may be provided at full thickness, C, or with raised face removed (the latter is nonstandard).


Class 400 lb
Pipe Flange Data Raised Face Drilling Data Unit Weight
Nominal
Pipe Size
A C G H I J
Outside
Diameter
Overall
Diameter
Flange
Thickness
min
Face
Diameter
Number
of  Holes
Bolt Hole
Diameter
Diameter
of Circle
of Holes
kg/
piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
1/2 0.840
21.30
3.750
95.20
0.560
14.20
1.380
35.10
4 0.620 15.70 2.620 66.55 0.76
3/4 1.050
26.70
4.620
117.3
0.620
15.70
1.690
42.90
4 0.750 19.10 3.250 82.60 1.28
1 1.315
33.40
4.880
123.9
0.690
17.50
2.000
50.80
4 0.750 19.10 3.500 88.90 1.6
1 1/4 1.660
42.20
5.250
133.3
0.810
20.60
2.500
63.50
4 0.750 19.10 3.880 98.60 2.23
1 1/2 1.900
48.30
6.120
155.4
0.880
22.30
2.880
73.15
4 0.880 22.40 4.500 114.3 3.25
2 2.375
60.30
6.500
165.1
1.000
25.40
3.620
91.90
8 0.750 19.10 5.000 127.0 4.15
2 1/2 2.875
73.00
7.500
190.5
1.120
28.40
4.120
104.6
8 0.880 22.40 5.880 149.4 6.13
3 3.500
88.90
8.250
209.5
1.250
31.70
5.000
127.0
8 0.880 22.40 6.620 168.1 8.44
31/2 4.000
101.6
9.000
228.6
1.380
35.00
5.500
139.7
8 1.000 25.40 7.250 184.2 11
4 4.500
114.3
10.00
254.0
1.380
35.10
6.190
157.2
8 1.000 25.40 7.880 200.2 13.7
5 5.563
141.3
11.00
279.4
1.500
38.10
7.310
185.7
8 1.000 25.40 9.250 235.0 18.5
6 6.625
168.3
12.50
317.5
1.620
41.10
8.500
215.9
12 1.000 25.40 10.62 269.7 25.5
8 8.625
219.1
15.00
381.0
1.880
47.80
10.62
269.7
12 1.120 28.40 13.00 330.2 42.6
10 10.75
273.0
17.50
444.5
2.120
53.80
12.75
323.9
16 1.250 31.75 15.25 387.4 64.5
12 12.75
323.8
20.50
520.7
2.250
57.15
15.00
381.0
16 1.380 35.10 17.75 450.9 94.3
14 14.00
355.6
23.00
584.2
2.380
60.45
16.25
412.8
20 1.380 35.10 20.25 514.4 124
16 16.00
406.4
25.50
647.7
2.500
63.50
18.50
469.9
20 1.500 38.10 22.50 571.5 162
18 18.00
457.2
28.00
711.2
2.620
66.55
21.00
533.4
24 1.500 38.10 24.75 628.7 205
20 20.00
508.0
30.50
774.7
2.750
69.85
23.00
584.2
24 1.620 41.10 27.00 685.8 254
24 24.00
609.6
36.00
914.4
3.000
76.20
27.25
692.2
24 1.880 47.80 32.00 812.8 386

Class 600 lb
Pipe Flange Data Raised Face Drilling Data Unit Weight
Nominal
Pipe Size
A C G H I J
Outside
Diameter
Overall
Diameter
Flange
Thickness
min
Face
Diameter
Number
of  Holes
Bolt Hole
Diameter
Diameter
of Circle
of Holes
kg/
piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
1/2 0.840
21.30
3.750
95.20
0.560
14.20
1.380
35.10
4 0.620 15.70 2.620 66.55 0.76
3/4 1.050
26.70
4.620
117.3
0.620
15.70
1.690
42.90
4 0.750 19.10 3.250 82.60 1.28
1 1.315
33.40
4.880
123.9
0.690
17.50
2.000
50.80
4 0.750 19.10 3.500 88.90 1.6
1 1/4 1.660
42.20
5.250
133.3
0.810
20.60
2.500
63.50
4 0.750 19.10 3.880 98.60 2.23
1 1/2 1.900
48.30
6.120
155.4
0.880
22.30
2.880
73.15
4 0.880 22.40 4.500 114.3 3.25
2 2.375
60.30
6.500
165.1
1.000
25.40
3.620
91.90
8 0.750 19.10 5.000 127.0 4.15
2 1/2 2.875
73.00
7.500
190.5
1.120
28.40
4.120
104.6
8 0.880 22.40 5.880 149.4 6.13
3 3.500
88.90
8.250
209.5
1.250
31.70
5.000
127.0
8 0.880 22.40 6.620 168.1 8.44
31/2 4.000
101.6
9.000
228.6
1.380
35.00
5.500
139.7
8 1.000 25.40 7.250 184.2 11
4 4.500
114.3
10.75
273.1
1.500
38.10
6.190
157.2
8 1.000 25.40 8.500 215.9 17.3
5 5.563
141.3
13.00
330.2
1.750
44.50
7.310
185.7
8 1.120 28.40 10.50 266.7 29.4
6 6.625
168.3
14.00
355.6
1.880
47.80
8.500
215.9
12 1.120 28.40 292.1 11.50 36.1
8 8.625
219.1
16.50
419.1
2.190
55.60
10.62
269.7
12 1.250 31.75 13.75 349.3 58.9
10 10.75
273.0
20.00
508.0
2.500
63.50
12.75
323.9
16 1.380 35.10 17.00 431.8 97.5
12 12.75
323.8
22.00
558.8
2.620
66.55
15.00
381.0
20 1.380 35.10 19.25 489.0 124
14 14.00
355.6
23.75
603.3
2.750
69.85
16.25
412.8
20 1.500 38.10 20.75 527.1 151
16 16.00
406.4
27.00
685.8
3.000
76.20
18.50
469.9
20 1.620 41.10 23.75 603.3 214
18 18.00
457.2
29.25
743.0
3.250
82.60
21.00
533.4
20 1.750 44.50 25.75 654.1 272
20 20.00
508.0
32.00
812.8
3.500
88.90
23.00
584.2
24 1.750 44.50 28.50 723.9 349
24 24.00
609.6
37.00
939.8
4.000
101.6
27.25
692.2
24 2.000 50.80 33.00 838.2 533

Class 900 lb
Pipe Flange Data Raised Face Drilling Data Unit Weight
Nominal
Pipe Size
A C G H I J
Outside
Diameter
Overall
Diameter
Flange
Thickness
min
Face
Diameter
Number
of  Holes
Bolt Hole
Diameter
Diameter
of Circle
of Holes
kg/
piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
1/2 0.840
21.30
4.750
120.6
0.880
22.30
1.380
35.10
4 0.880 22.30 3.250 82.50 1.77
3/4 1.050
26.70
5.120
130.0
1.000
25.40
1.690
42.90
4 0.880 22.30 3.500 88.90 2.42
1 1.315
33.40
5.880
149.3
1.120
28.40
2.000
50.80
4 1.000 25.40 4.000 101.6 3.57
1 1/4 1.660
42.20
6.250
158.7
1.120
28.40
2.500
63.50
4 1.000 25.40 4.380 111.2 4.15
1 1/2 1.900
48.30
7.000
177.8
1.250
31.70
2.880
73.15
4 1.120 28.40 4.880 123.9 5.75
2 2.375
60.30
8.500
215.9
1.500
38.10
3.620
91.90
8 1.000 25.40 6.500 165.1 10.1
2 1/2 2.875
73.00
9.620
244.3
1.620
41.10
4.120
104.6
8 1.120 28.40 7.500 190.5 14
3 3.500
88.90
9.500
241.3
1.500
38.10
5.000
127.0
8 1.000 25.40 7.500 190.5 13.1
4 4.500
114.3
11.50
292.1
1.750
44.50
6.190
157.2
8 1.250 31.70 9.250 234.9 26.9
5 5.563
141.3
13.75
349.2
2.000
50.80
7.310
185.7
8 1.380 35.00 279.4 11.00 36.5
6 6.625
168.3
15.00
381.0
2.190
55.60
8.500
215.9
12 1.250 31.70 12.50 317.0 47.4
8 8.625
219.1
18.50
469.9
2.500
63.50
10.62
269.7
12 1.500 38.10 15.50 393.7 82.5
10 10.75
273.0
21.50
546.1
2.750
69.85
12.75
323.9
16 1.500 38.10 18.50 469.9 122
12 12.75
323.8
24.00
609.6
3.120
79.25
15.00
381.0
20 1.500 38.10 21.00 533.4 173
14 14.00
355.6
25.25
641.3
3.380
85.80
16.25
412.8
20 1.620 41.10 22.00 558.8 206
16 16.00
406.4
27.75
704.8
3.500
88.90
18.50
469.9
20 1.750 44.40 24.25 615.9 259
18 18.00
457.2
31.00
787.4
4.000
101.6
21.00
533.4
20 2.000 50.80 27.00 685.8 367
20 20.00
508.0
33.75
857.2
4.250
107.9
23.00
584.2
20 2.120 53.80 29.50 749.3 463
24 24.00
609.6
41.00
1041.4
5.500
139.7
27.25
692.2
20 2.620 66.55 35.50 901.7 876

Class 1500 lb
Pipe Flange Data Raised Face Drilling Data Unit Weight
Nominal
Pipe Size
A C G H I J
Outside
Diameter
Overall
Diameter
Flange
Thickness
min
Face
Diameter
Number
of  Holes
Bolt Hole
Diameter
Diameter
of Circle
of Holes
kg/
piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
1/2 0.840
21.30
4.750
120.6
0.880
22.30
1.380
35.10
4 0.880 22.30 3.250 82.50 1.77
3/4 1.050
26.70
5.120
130.0
1.000
25.40
1.690
42.90
4 0.880 22.30 3.500 88.90 2.42
1 1.315
33.40
5.880
149.3
1.120
28.40
2.000
50.80
4 1.000 25.40 4.000 101.6 3.57
1 1/4 1.660
42.20
6.250
158.7
1.120
28.40
2.500
63.50
4 1.000 25.40 4.380 111.2 4.15
1 1/2 1.900
48.30
7.000
177.8
1.250
31.70
2.880
73.15
4 1.120 28.40 4.880 123.9 5.75
2 2.375
60.30
8.500
215.9
1.500
38.10
3.620
91.90
8 1.000 25.40 6.500 165.1 10.1
2 1/2 2.875
73.00
9.620
244.3
1.620
41.10
4.120
104.6
8 1.120 28.40 7.500 190.5 14
3 3.500
88.90
10.50
266.7
1.880
47.70
5.000
127.0
8 1.250 31.70 8.000 203.2 19.1
4 4.500
114.3
12.25
311.1
2.120
53.80
6.190
157.2
8 1.380 35.00 9.500 241.3 29.9
5 5.563
141.3
14.75
374.6
2.880
73.15
7.310
185.7
8 1.620 41.10 292.1 11.50 58.4
6 6.625
168.3
15.50
393.7
3.250
82.50
8.500
215.9
12 1.500 38.10 12.50 317.5 71.8
8 8.625
219.1
19.00
482.6
3.620
91.90
10.62
269.7
12 1.750 44.40 15.50 393.7 122
10 10.75
273.0
23.00
584.2
4.250
107.9
12.75
323.9
12 2.000 50.80 19.00 482.6 210
12 12.75
323.8
26.50
673.1
4.880
123.9
15.00
381.0
16 2.120 53.8 22.50 571.5 316
14 14.00
355.6
29.50
749.3
5.250
133.3
16.25
412.8
16 2.380 60.45 25.00 635.0 420
16 16.00
406.4
32.50
825.5
5.750
146.0
18.50
469.9
16 2.620 66.55 27.75 704.8 558
18 18.00
457.2
36.00
914.4
6.380
162.0
21.00
533.4
16 2.880 73.15 30.50 774.7 760
20 20.00
508.0
38.75
984.2
7.000
177.8
23.00
584.2
16 3.120 79.25 32.75 831.8 965
24 24.00
609.6
46.00
1168.4
8.000
203.2
27.25
692.2
16 3.620 91.90 39.00 990.6 1558

Class 2500 lb
Pipe Flange Data Raised Face Drilling Data Unit Weight
Nominal
Pipe Size
A C G H I J
Outside
Diameter
Overall
Diameter
Flange
Thickness
min
Face
Diameter
Number
of  Holes
Bolt Hole
Diameter
Diameter
of Circle
of Holes
kg/
piece
in
mm
in
mm
in
mm
in
mm
in
mm
in
mm
1/2 0.840
21.30
5.250
133.4
1.190
30.20
1.380
35.10
4 0.880 22.40 3.500 88.90 2.99
3/4 1.050
26.70
5.500
139.7
1.250
31.70
1.690
42.90
4 0.880 22.40 3.750 95.30 3.5
1 1.315
33.40
6.250
158.8
1.380
35.10
2.000
50.80
4 1.000 25.40 4.250 108.0 4.96
1 1/4 1.660
42.20
7.250
184.2
1.500
38.10
2.500
63.50
4 1.120 28.40 5.120 130.0 7.35
1 1/2 1.900
48.30
8.000
203.2
1.750
44.50
2.880
73.15
4 1.250 31.75 5.750 146.1 10.4
2 2.375
60.30
9.250
235.0
2.000
50.80
3.620
91.90
8 1.120 28.40 6.750 171.5 15.6
2 1/2 2.875
73.00
10.50
266.7
2.250
57.15
4.120
104.6
8 1.250 31.75 7.750 196.9 22.6
3 3.500
88.90
12.00
304.8
2.620
66.55
5.000
127.0
8 1.380 35.10 9.000 228.6 34.8
4 4.500
114.3
14.00
355.6
3.000
76.20
6.190
157.2
8 1.620 41.10 10.75 273.1 53.9
5 5.563
141.3
16.50
419.1
3.620
91.90
7.310
185.7
8 1.888 47.88 12.75 323.9 90.8
6 6.625
168.3
19.00
482.6
4.250
108.0
8.500
215.9
8 2.120 53.80 14.50 368.3 141
8 8.625
219.1
21.75
552.5
5.000
127.0
10.62
269.7
12 2.120 53.80 17.25 438.2 214
10 10.75
273.0
26.50
673.1
6.500
165.1
12.75
323.9
12 2.620 66.55 21.25 539.8 411
12 12.75
323.8
30.00
762.0
7.250
184.2
15.00
381.0
12 2.880 73.15 24.38 619.3 592

Notes
- Weights are based on manufacturer’s data and are approximate.
Click times:42Release time:4/18/2017 【Print】【Close
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