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Socket Weld Flange Dimensions – Class 150 to Class 1500

Socket weld flange dimensions are covered in ASME B16.5 – which covers Pipe Flanges and Flanged Fittings for size NPS ½” to 24” for above NPS 26” to 60” it should be as per ASME B16.47. Socket weld flanges are available only up to 3″ NPS Size.

During dimensional inspection of flange, you should check for

  • Outer & Inner Diameter of body
  • Bolt Circle & Bolt Hole Diameter
  • Depth of the socket
  • Length of the Hub and
  • Straightness and alignment of the bolt hole

socket weld flange dimensionsClass 150 Socket Neck Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 90 9.6 30 14 34.9 2 10 60.3 22.2 4 1/2 50 55 5/8 M14 0.8
3/4 20 100 11.2 38 14 42.9 2 11 69.9 27.7 4 1/2 50 65 5/8 M14 0.9
1 25 110 12.7 49 16 50.8 2 13 79.4 34.5 4 1/2 55 65 5/8 M14 0.9
1 1/4 32 115 14.3 59 19 63.5 2 14 88.9 43.2 4 1/2 55 70 5/8 M14 1.4
1 1/2 40 125 15.9 65 21 73 2 16 98.4 49.5 4 1/2 65 70 5/8 M14 1.4
2 50 150 17.5 78 24 92.1 2 17 120.7 61.9 4 5/8 70 85 3/4 M16 2.3
2 1/2 65 180 20.7 90 27 105 2 19 139.7 74.6 4 5/8 75 90 3/4 M16 3.2
3 80 190 22.3 108 29 127 2 21 152.4 90.7 4 5/8 75 90 3/4 M16 3.7

Class 300 Socket Neck Flange Dimensions

Size in Inch Size in mm Outer Dia. Flange Thick. Hub OD Flange Length RF Dia. RF Height Socket Depth PCD Socket Bore No of Bolts Bolt Size UNC Machine Bolt Length RF Stud Length Hole Size ISO Stud Size Weight in kg
A B C D E F G H J
1/2 15 95 12.7 38 21 34.9 2 10 66.7 22.2 4 1/2 55 65 5/8 M14 1.2
3/4 20 115 14.3 48 24 42.9 2 11 82.6 27.7 4 5/8 65 75 3/4 M16 1.4
1 25 125 15.9 54 25 50.8 2 13 88.9 34.5 4 5/8 65 75 3/4 M16 1.4
1 1/4 32 135 17.5 64 25 63.5 2 14 98.4 43.2 4 5/8 70 85 3/4 M16 1.8
1 1/2 40 155 19.1 70 29 73 2 16 114.3 49.5 4 3/4 75 90 7/8 M20 2.7
2 50 165 20.7 84 32 92.1 2 17 127 61.9 8 5/8 75 90 3/4 M16 3.2
2 1/2 65 190 23.9 100 37 105 2 19 149.2 74.6 8 3/4 85 100 7/8 M20 4.6
3 80 210 27 117 41 127 2 21 168.3 90.7 8 3/4 90 110 7/8 M20 5.9 






Class 600 Socket Neck Flange Dimensions






Size in Inch
Size in mm
Outer Dia.
Flange Thick.
Hub OD
Flange Length
RF Dia.
RF Height
Socket Depth
PCD
Socket Bore
No of Bolts
Bolt Size UNC
RF Stud Length
Hole Size
ISO Stud Size
Weight in kg






A
B
C
D
E
F
G
H
J










1/2
15
95
14.3
38
22
34.9
7
10
66.7
22.2
4
1/2
75
5/8
M14
1.3




3/4
20
115
15.9
48
25
42.9
7
11
82.6
27.7
4
5/8
90
3/4
M16
1.4




1
25
125
17.5
54
27
50.8
7
13
88.9
34.5
4
5/8
90
3/4
M16
1.8




1 1/4
32
135
20.7
64
29
63.5
7
14
98.4
43.2
4
5/8
95
3/4
M16
2.3




1 1/2
40
155
22.3
70
32
73
7
16
114.3
49.5
4
3/4
110
7/8
M20
3.2




2
50
165
25.4
84
37
92.1
7
17
127
61.9
8
5/8
110
3/4
M16
4.1




2 1/2
65
190
28.6
100
41
105
7
19
149.2
74.6
8
3/4
120
7/8
M20
5.9




3
80
210
31.8
117
46
127
7
21
168.3
90.7
8
3/4
125
7/8
M20
7.3














Class 1500 Socket Neck Flange Dimensions






Size in Inch
Size in mm
Outer Dia.
Flange Thick.
Hub OD
Flange Length
RF Dia.
RF Height
Socket Depth
PCD
Socket Bore
No of Bolts
Bolt Size UNC
RF Stud Length
Hole Size
ISO Stud Size
Weight in kg






A
B
C
D
E
F
G
H
J










1/2
15
120
22.3
38
32
34.9
7
10
82.6
22.2
4
3/4
110
7/8
M20
1.8




3/4
20
130
25.4
44
35
42.9
7
11
88.9
27.7
4
3/4
115
7/8
M20
2.3




1
25
150
28.6
52
41
50.8
7
13
101.6
34.5
4
7/8
125
1
M24
3.7




1 1/4
32
160
28.6
64
41
63.5
7
14
111.1
43.2
4
7/8
125
1
M24
4.1




1 1/2
40
180
31.8
70
44
73
7
16
123.8
49.5
4
1
140
1 1/8
M27
5.5




2
50
215
38.1
105
57
92.1
7
17
165.1
61.9
8
7/8
145
1
M24
9.8




2 1/2
65
245
41.3
124
64
105
7
19
190.5
74.6
8
1
160
1 1/8
M27
16.4




3
80
265
47.7
133
N/A
127
7

203.2
N/A
8
1 1/8
180
1 1/4
M30
21.8






Disclaimer –  Please check with ASME B16.5 Before using.











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