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Class 150 Steel Flanges
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Mid-States Brochures
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flanges
Class 150 Steel Pipe Flanges
PipeSize
O
C
X
A
Y
Y
Y
T
B1
B
B2
r
D
Outside
Diameter
of
Flange
Thickness
of Flange,
Minimum
Diameter
of Hub
Diameter
of
Weldneck
Threaded
Slip-On
Lap-Joint
Weld Neck
Thread
Length
Threaded
Flange,
Minimum
Slip-On,
Minimum
Lap-Joint,
Minimum
Weld neck / Socket
weld
Lap-Joint
Flange
Radius
Depth of Socket
1/2
3.5
0.44
1.19
0.84
0.62
0.62
1.88
0.62
0.88
0.9
0.62
0.12
0.38
3/4
3.88
0.5
1.5
1.05
0.62
0.62
2.06
0.62
1.09
1.11
0.82
0.12
0.44
1
4.25
0.56
1.94
1.32
0.69
0.69
2.19
0.69
1.36
1.38
1.05
0.12
0.5
1 1/4
4.62
0.62
2.31
1.66
0.81
0.81
2.25
0.81
1.7
1.72
1.38
0.19
0.56
1 1/2
5
0.69
2.56
1.9
0.88
0.88
2.44
0.88
1.95
1.97
1.61
0.25
0.62
2
6
0.75
3.06
2.38
1
1
2.5
1
2.44
2.46
2.07
0.31
0.69
2 1/2
7
0.88
3.56
2.88
1.12
1.12
2.75
1.12
2.94
2.97
2.47
0.31
0.75
3
7.5
0.94
4.25
3.5
1.19
1.19
2.75
1.19
3.57
3.6
3.07
0.38
0.81
3 1/2
8.5
0.94
4.81
4
1.25
1.25
2.81
1.25
4.07
4.1
3.55
0.38
...
4
9
0.94
5.31
4.5
1.31
1.31
3
1.31
4.57
4.6
4.03
0.44
...
5
10
0.94
6.44
5.56
1.44
1.44
3.5
1.44
5.66
5.69
5.05
0.44
...
6
11
1
7.56
6.63
1.56
1.56
3.5
1.56
6.72
6.75
6.07
0.5
...
8
13.5
1.12
9.69
8.63
1.75
1.75
4
1.75
8.72
8.75
7.98
0.5
...
10
16
1.19
12
10.75
1.94
1.94
4
1.94
10.88
10.92
10.02
0.5
...
12
19
1.25
14.38
12.75
2.19
2.19
4.5
2.19
12.88
12.92
12
0.5
...
14
21
1.38
15.75
14
2.25
3.12
5
2.25
14.14
14.18
13.25
0.5
...
16
23.5
1.44
18
16
2.5
3.44
5
2.5
16.16
16.19
15.25
0.5
...
18
25
1.56
19.88
18
2.69
3.81
5.5
2.69
18.18
18.2
17.25
0.5
...
20
27.5
1.69
22
20
2.88
4.06
5.69
2.88
20.2
20.25
19.25
0.5
...
24
32
1.88
26.12
24
3.25
4.38
6
3.25
24.25
24.25
23.25
0.5
...
Pipe Size
BOLTING PATTERN AND BOLT LENGTHS
Diameter of Bolt Circle
Diameter of Bolt Holes
Number of Bolts
Diameter of Bolts
Machine Bolts
0.006 in
Raised Face
Stud Bolts
0.006 in
Raised Face
1/2
2.38
0.62
4
0.5
2
2.5
3/4
2.75
0.62
4
0.5
2.25
2.5
1
3.12
0.62
4
0.5
2.25
2.75
1 1/4
3.5
0.62
4
0.5
2.5
2.75
1 1/2
3.88
0.62
4
0.5
2.5
3
2
4.75
0.75
4
0.62
2.75
3.25
2 1/2
5.5
0.75
4
0.62
3
3.5
3
6
0.75
4
0.62
3.25
3.75
3 1/2
7
0.75
8
0.62
3.25
3.75
4
7.5
0.75
8
0.62
3.25
3.75
5
8.5
0.88
8
0.75
3.25
4
6
9.5
0.88
8
0.75
3.5
4
8
11.75
0.88
8
0.75
3.75
4.25
10
14.25
1
12
0.88
4.25
4.75
12
17
1
12
0.88
4.25
4.75
14
18.75
1.12
12
1
4.5
5.25
16
21.25
1.12
16
1
4.75
5.5
18
22.75
1.25
16
1.12
5
6
20
25
1.25
20
1.12
5.5
6.25
24
29.5
1.38
20
1.25
6
7
30
36
1.38
28
1.25
36
42.75
1.62
32
1.5
42
49.5
1.62
36
1.5
48
56
1.62
44
1.5
