Piping • Special piping fittings

Standard dimensions of spectacle blind / 8 blind

3 Min Read

An '8 blind' or a 'spectacle blind' is a piping fitting that is used for providing positive isolation.

A spectacle blind is basically made up of two metal discs attached to each other by a metal strip as shown in the figure. One is solid disc and the other is hollowed. The hollowed disc allows fluid flow and solid disc is used for positive isolation. You can simply rotate a spectacle blind by 180 degrees to close or open a pipe to allow fluid to pass.

Standard dimensions of spectacle blinds or 8 blinds

These standard dimensions of spectacle blinds are in specified in inches. They are as per as per ASME B16.48.

PIPE
SIZE
150#
FLANGES
A
B
C
D
E
F
1/2"
5/8
1-3/4
2-3/8
5/8
1-1/2
1/4
3/4"
13/16
2-1/8
2-3/4
5/8
1-1/2
1/4
1"
1-1/8
2-1/2
3-1/8
9/16
1-1/2
1/4
1-1/4"
1-5/8
2-7/8
3-1/2
9/16
1-1/2
1/4
1-1/2"
1-7/8
3-1/4
3-7/8
9/16
1-1/2
1/4
2"
2-3/8
4
4-3/4
11/16
2
1/4
2-1/2"
2-7/8
4-3/4
5-1/2
11/16
2
1/4
3"
3-1/2
5-1/4
6
11/16
2-1/2
1/4
3-1/2"
4
6-1/4
7
3/4
2-1/2
3/8
4"
4-1/2
6-3/4
7-1/2
3/4
2-1/2
3/8
5"
5-9/16
7-5/8
8-1/2
7/8
3
3/8
6"
6-5/8
8-5/8
9-1/2
7/8
3
1/2
8"
8-5/8
10-7/8
11-3/4
7/8
3
1/2
10"
10-3/4
13-1/4
14-1/4
1
4
5/8
12"
12-3/4
16
17
1
4
3/4
14"
14
17-5/8
18-3/4
1-1/8
4-1/4
3/4
16"
16
20-1/8
21-1/4
1-1/8
4-1/4
7/8
18"
18
21-1/2
22-3/4
1-1/4
4-1/2
1
20"
20
23-3/4
25
1-1/4
4-3/4
1-1/8
24"
24
28-1/8
29-1/2
1-3/8
5-1/2
1-1/4

 

PIPE
SIZE
300#
FLANGES
A
B
C
D
E
F
1/2"
5/8
2
2-5/8
5/8
1-1/2
1/4
3/4"
13/16
2-1/2
3-1/4
3/4
1-1/2
1/4
1"
1-1/8
2-3/4
3-1/2
11/16
1-1/2
1/4
1-1/4"
1-5/8
3-1/8
3-7/8
11/16
1-1/2
1/4
1-1/2"
1-7/8
3-5/8
4-1/2
7/8
2
1/4
2"
2-3/8
4-1/4
5
3/4
2
3/8
2-1/2"
2-7/8
5
5-7/8
7/8
2-1/2
3/8
3"
3-1/2
5-3/4
6-5/8
7/8
2-1/2
3/8
3-1/2"
4
6-3/8
7-1/4
7/8
2-1/2
1/2
4"
4-1/2
7
7-7/8
7/8
2-1/2
1/2
5"
5-5/8
8-3/8
9-1/4
7/8
3
5/8
6"
6-5/8
9-3/4
10-5/8
7/8
3
5/8
8"
8-5/8
12
13
1
3-1/2
7/8
10"
10-3/4
14-1/8
15-1/4
1-1/8
4
1
12"
12-3/4
16-1/2
17-3/4
1-1/4
4
1-1/8
14"
14
19
20-1/4
1-1/4
4-3/4
1-1/4
16"
16
21-1/8
22-1/2
1-3/8
4-7/8
1-1/2
18"
18
23-3/8
24-3/4
1-3/8
4-1/2
1-5/8
20"
20
25-5/8
27
1-3/8
4-3/4
1-3/4
24"
24
30-3/8
32
1-5/8
5-1/2
2

 

PIPE
SIZE
600#
FLANGES
A
B
C
D
E
F
1/2"
5/8
2
2-5/8
5/8
1-1/2
1/4
3/4"
13/16
2-1/2
3-1/4
3/4
1-1/2
1/4
1"
1-1/8
2-3/4
3-1/2
3/4
2-1/4
1/4
1-1/4"
1-7/16
3-1/8
3-7/8
3/4
2-1/4
3/8
1-1/2"
1-11/16
3-5/8
4-1/2
7/8
2-5/8
3/8
2"
2-1/8
4-1/4
5
3/4
2-1/4
3/8
2-1/2"
2-5/8
5
5-7/8
7/8
2-5/8
1/2
3"
3-1/4
5-3/4
6-5/8
7/8
2-5/8
1/2
3-1/2"
3-3/4
6-1/4
7-1/4
1
3
5/8
4"
4-1/4
7-1/2
8-1/2
1
3
5/8
5"
5-1/4
9-3/8
10-1/2
1-1/8
3-3/8
3/4
6"
6-3/8
10-3/8
11-1/2
1-1/8
3-3/8
7/8
8"
8-3/8
12-1/2
13-3/4
1-1/4
3-3/4
1-1/8
10"
10-7/16
15-5/8
17
1-3/8
4-1/8
1-3/8
12"
12-3/8
17-7/8
19-1/4
1-3/8
4-1/8
1-5/8
14"
13-5/8
19-1/4
20-3/4
1-1/2
4-1/2
1-3/4
16"
15-5/8
22-1/8
23-3/4
1-5/8
4-7/8
2
18"
17-5/8
24
25-3/4
1-3/4
5-1/4
2-1/8
20"
19-5/16
26-3/4
28-1/2
1-3/4
5-1/4
2-1/2
24"
23-1/2
31
33
2
6
2-7/8

 

PIPE
SIZE
900#
FLANGES
A
B
C
D
E
F
1/2"
0.625
2.375
3.25
-
1.50
1/4
3/4"
0.0825
2.625
3.50
0.875
1.625
1/4
1"
1.05
3.0
4.0
1.0
2.25
1/4
1-1/4"
1.44
3.375
4.375
1.0
2.25
3/8
1-1/2"
1.68
3.5
4.875
1.125
2.625
3/8
2"
2.16
5.5
6.5
1.0
2.25
1/2
2-1/2"
2.64
6.375
7.5
1.125
2.625
1/2
3"
3.25
6.5
7.5
1.0
2.625
5/8
4"
4.25
8.0
9.25
1.25
3.0
3/4
5"
5.3
9.625
11.0
1.375
3.375
7/8
6"
6.36
11.25
12.5
1.25
3.375
1
8"
8.33
14.0
15.5
1.5
3.75
1-3/8
10"
10.42
17.0
18.5
1.5
4.125
1-5/8
12"
12.39
19.5
21.0
1.5
4.125
1-7/8
14"
13.62
20.375
22.0
1.625
4.5
2-1/8
16"
15.62
22.5
24.25
1.75
4.875
2-3/8
18"
17.62
25.0
27.0
2.0
5.25
2-5/8
20"
19.56
27.375
29.5
2.125
5.25
2-7/8
24"
23.5
32.875
35.5
2.625
6.0
3-1/2

 

PIPE
SIZE
1500#
FLANGES
A
B
C
D
E
F
1/2"
0.625
2.375
3.25
-
1.50
1/4
3/4"
0.82
2.625
3.50
0.875
1.625
3/8
1"
1.05
3.0
4.0
1.0
2.5
3/8
1-1/4"
1.375
3.375
4.375
1.0
2.5
3/8
1-1/2"
1.61
3.75
4.875
1.125
2.75
1/2
2"
2.07
5.5
6.5
1.0
2.75
1/2
2-1/2"
2.47
6.375
7.5
1.125
3.0
5/8
3"
3.07
6.75
8.0
1.25
3.0
3/4
4"
4.03
8.125
9.5
1.375
3.5
7/8
5"
5.05
9.875
11.5
1.625
3.5
1-1/8
6"
6.06
11.0
12.5
1.5
3.5
1-3/8
8"
7.98
13.75
15.5
1.75
4.0
1-5/8
10"
10.02
17.0
19.0
2.0
4.5
2
12"
11.94
20.375
22.5
2.125
4.5
2-3/8
14"
13.12
22.625
25.0
2.375
5.0
2-5/8
16"
15.0
25.125
27.75
2.625
5.25
3
18"
16.88
27.625
30.5
2.875
5.75
3-3/8
20"
18.81
29.625
32.75
3.125
6.0
3-3/4
24"
22.62
35.375
39.0
3.625
7.0
4-3/8

 

PIPE
SIZE
2500#
FLANGES
A
B
C
D
E
F
1/2"
0.625
2.625
3.5
-
1.50
3/8
3/4"
0.82
2.875
3.75
0.875
1.625
3/8
1"
1.05
3.25
4.25
1.0
2.5
3/8
1-1/4"
1.38
4.0
5.125
1.125
2.5
1/2
1-1/2"
1.61
4.5
5.75
1.25
2.75
5/8
2"
2.07
5.625
6.75
1.125
2.75
5/8
2-1/2"
2.47
6.5
7.75
1.25
3.0
3/4
3"
3.07
7.625
9.0
1.375
3.0
7/8
4"
4.03
9.125
10.75
1.625
3.5
1-1/8
5"
5.05
10.875
12.75
1.875
3.5
1-3/8
6"
6.06
12.375
14.5
2.125
3.5
2
8"
7.81
15.125
17.25
2.125
4.0
2-1/8
10"
9.75
18.625
21.25
2.625
4.5
2-5/8
12"
11.37
21.5
24.375
2.875
4.5
3-1/8
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