Socket Weld flanges were initially developed for use on small-size high pressure piping. Their static strength is equal to Slip On flanges, but their fatigue strength 50% greater than double-welded Slip On flanges. The connection with the pipe is done with 1 fillet weld, at the outside of the flange. But before welding, a space must be created between flange or fitting and pipe.

ASME B16.5 Socket Weld Flange Dimensions

ASME B16.5 Socket Weld Flange Dimensions

 

ANSI, ASME, ASA B16.5 150lb/sq.in. SOCKET WELD FLANGE RF
Nominal Size
  
Outside Diam.
Thick. of Flange
Diam. of Raised Face
Diam of Hub at Base
Length Thru Hub
Diam. of Bore
Depth of Socket
No. of Holes
Diam. of Holes
Diam. of Bolts
Diam. of Bolt Circle
Approx. Weight Pounds Kg
O
C
R
X
Y
B
D
1/2″
in.
3.5
0.44
1.38
1.19
0.62
0.88
0.38
4
0.62
1/2
2.38
1
mm.
88.9
11.2
35.1
30.2
15.7
22.4
9.7
15.7
12.7
60.5
0.5
3/4″
in.
3.88
0.5
1.69
1.5
0.62
1.09
0.44
4
0.62
1/2
2.75
2
mm.
98.6
12.7
42.9
38.1
15.7
27.7
11.2
15.7
12.7
69.9
1
1″
in.
4.25
0.56
2
1.94
0.69
1.36
0.5
4
0.62
1/2
3.12
2
mm.
108
14.2
50.8
49.3
17.5
34.5
12.7
15.7
12.7
79.2
1
1 1/4″
in.
4.62
0.62
2.5
2.31
0.81
1.7
0.56
4
0.62
1/2
3.5
3
mm.
117.3
15.7
63.5
58.7
20.6
43.2
14.2
15.7
12.7
88.9
1
1 1/2″
in.
5
0.69
2.88
2.56
0.88
1.95
0.62
4
0.62
1/2
3.88
3
mm.
127
17.5
73.2
65
22.4
49.5
15.7
15.7
12.7
98.6
1
2″
in.
6
0.75
3.62
3.06
1
2.44
0.69
4
0.75
5/8
4.75
5
mm.
152.4
19.1
91.9
77.7
25.4
62
17.5
19.1
15.9
120.7
2
2 1/2″
in.
7
0.88
4.12
3.56
1.12
2.94
0.75
4
0.75
5/8
5.5
7
mm.
177.8
22.4
104.6
90.4
28.4
74.7
19.1
19.1
15.9
139.7
3
3″
in.
7.5
0.94
5
4.25
1.19
3.57
0.81
4
0.75
5/8
6
8
mm.
190.5
23.9
127
108
30.2
90.7
20.6
19.1
15.9
152.4
4
3 1/2″
in.
8.5
0.94
5.5
4.81
1.25
4.07
 　

 
8
0.75
5/8
7
11
mm.
215.9
23.9
139.7
122.2
31.8
103.4
 　

 
19.1
15.9
177.8
5
4″
in.
9
0.94
6.19
5.31
1.31
4.57
 　

 
8
0.75
5/8
7.5
13
mm.
228.6
23.9
157.2
134.9
33.3
116.1
 　

 
19.1
15.9
190.5
6
5″
in.
10
0.94
7.31
6.44
1.44
5.66
 　

 
8
0.88
3/4
8.5
15
mm.
254
23.9
185.7
163.6
36.6
143.8
 　

 
22.4
19.1
215.9
7
6″
in.
11
1
8.5
7.56
1.56
6.72
 　

 
8
0.88
3/4
9.5
19
mm.
279.4
25.4
215.9
192
39.6
170.7
 　

 
22.4
19.1
241.3
9
8″
in.
13.5
1.12
10.62
9.69
1.75
8.72
 　

 
8
0.88
3/4
11.75
30
mm.
342.9
28.4
269.7
246.1
44.5
221.5
 　

 
22.4
19.1
298.5
14
10″
in.
16
1.19
12.75
12
1.94
10.88
 　

 
12
1
7/8
14.25
43
mm.
406.4
30.2
323.9
304.8
49.3
276.4
 　

 
25.4
22.2
362
20
12″
in.
19
1.25
15
14.38
2.19
12.88
 　

 
12
1
7/8
17
64
mm.
482.6
31.8
381
365.3
55.6
327.2
 　

 
25.4
22.2
431.8
29
14″
in.
21
1.38
16.25
15.75
2.25
14.14
 　

 
12
1.12
1
18.75
90
mm.
533.4
35.1
412.8
400.1
57.2
359.2
 　

 
28.4
25.4
476.3
41
16″
in.
23.5
1.44
18.5
18
2.5
16.16
 　

 
16
1.12
1
21.25
98
mm.
596.9
36.6
469.9
457.2
63.5
410.5
 　

 
28.4
25.4
539.8
44
18″
in.
25
1.56
21
19.88
2.69
18.18
 　

 
16
1.25
1  1/8
22.75
130
mm.
635
39.6
533.4
505
68.3
461.8
 　

 
31.8
28.6
577.9
59
20″
in.
27.5
1.69
23
22
2.88
20.2
 　

 
20
1.25
1 1/8
25
165
mm.
698.5
42.9
584.2
558.8
73.2
513.1
 　

 
31.8
28.6
635
75
24″
in.
32
1.88
27.25
26.12
3.25
24.25
 　

 
20
1.38
1  1/4
29.5
220
mm.
812.8
47.8
692.2
663.4
82.6
616
 　

 
35.1
31.8
749.3
100

 

ANSI, ASME, ASA B16.5 300lb/sq.in. SOCKET WELD FLANGE RF
Nominal Size
  
Outside Diam.
Thick. of Flange
Diam. of Raised Face
Diam of Hub at Base
Length Thru Hub
Diam. of Bore
Depth of Socket
No. of Holes
Diam. of Holes
Diam. of Bolts
Diam. of Bolt Circle
Approx. Weight Pounds Kg
O
C
R
X
Y
B
D
1/2″
in.
3.75
0.56
1.38
1.5
0.88
0.88
0.38
4
0.62
1/2
2.62
2
mm.
95.3
14.2
35.1
38.1
22.4
22.4
9.7
15.7
12.7
66.5
1
3/4″
in.
4.62
0.62
1.69
1.88
1
1.09
0.44
4
0.75
5/8
3.25
3
mm.
117.3
15.7
42.9
47.8
25.4
27.7
11.2
19.1
15.9
82.6
1
1″
in.
4.88
0.69
2
2.12
1.06
1.36
0.5
4
0.75
5/8
3.5
3
mm.
124
17.5
50.8
53.8
26.9
34.5
12.7
19.1
15.9
88.9
1
1 1/4″
in.
5.25
0.75
2.5
2.5
1.06
1.7
0.56
4
0.75
5/8
3.88
4
mm.
133.4
19.1
63.5
63.5
26.9
43.2
14.2
19.1
15.9
98.6
2
1 1/2″
in.
6.12
0.81
2.88
2.75
1.19
1.95
0.62
4
0.88
3/4
4.5
6
mm.
155.4
20.6
73.2
69.9
30.2
49.5
15.7
22.4
19.1
114.3
3
2″
in.
6.5
0.88
3.62
3.31
1.31
2.44
0.69
8
0.75
5/8
5
7
mm.
165.1
22.4
91.9
84.1
33.3
62
17.5
19.1
15.9
127
3
2 1/2″
in.
7.5
1
4.12
3.94
1.5
2.94
0.75
8
0.88
3/4
5.88
10
mm.
190.5
25.4
104.6
100.1
38.1
74.7
19.1
22.4
19.1
149.4
5
3″
in.
8.25
1.12
5
4.62
1.69
3.57
0.81
8
0.88
3/4
6.62
13
mm.
209.6
28.4
127
117.3
42.9
90.7
20.6
22.4
19.1
168.1
6
3 1/2″
in.
9
1.19
5.5
5.25
1.75
4.07
 　

 
8
0.88
3/4
7.25
17
mm.
228.6
30.2
139.7
133.4
44.5
103.4
 　

 
22.4
19.1
184.2
8
4″
in.
10
1.25
6.19
5.75
1.88
4.57
 　

 
8
0.88
3/4
7.88
22
mm.
254
31.8
157.2
146.1
47.8
116.1
 　

 
22.4
19.1
200.2
10
5″
in.
11
1.38
7.31
7
2
5.66
 　

 
8
0.88
3/4
9.25
28
mm.
279.4
35.1
185.7
177.8
50.8
143.8
 　

 
22.4
19.1
235
13
6″
in.
12.5
1.44
8.5
8.12
2.06
6.72
 　

 
12
0.88
3/4
10.62
39
mm.
317.5
36.6
215.9
206.2
52.3
170.7
 　

 
22.4
19.1
269.7
18
8″
in.
15
1.62
10.62
10.25
2.44
8.72
 　

 
12
1
7/8
13
58
mm.
381
41.1
269.7
260.4
62
221.5
 　

 
25.4
22.2
330.2
26
10″
in.
17.5
1.88
12.75
12.62
2.62
10.88
 　

 
16
1.12
1
15.25
81
mm.
444.5
47.8
323.9
320.5
66.5
276.4
 　

 
28.4
25.4
387.4
37
12″
in.
20.5
2
15
14.75
2.88
12.88
 　

 
16
1.25
1 1/8
17.75
115
mm.
520.7
50.8
381
374.7
73.2
327.2
 　

 
31.8
28.6
450.9
52
14″
in.
23
2.12
16.25
16.75
3
14.14
 　

 
20
1.25
1  1/8
20.25
165
mm.
584.2
53.8
412.8
425.5
76.2
359.2
 　

 
31.8
28.6
514.4
75
16″
in.
25.5
2.25
18.5
19
3.25
16.16
 　

 
20
1.38
1 1/4
22.5
190
mm.
647.7
57.2
469.9
482.6
82.6
410.5
 　

 
35.1
31.8
571.5
86
18″
in.
28
2.38
21
21
3.5
18.18
 　

 
24
1.38
1  1/4
24.75
250
mm.
711.2
60.5
533.4
533.4
88.9
461.8
 　

 
35.1
31.8
628.7
113
20″
in.
30.5
2.5
23
23.12
3.75
20.2
 　

 
24
1.38
1 1/4
27
315
mm.
774.7
63.5
584.2
587.2
95.3
513.1
 　

 
35.1
31.8
685.8
143
24″
in.
36
2.75
27.25
27.62
4.19
24.25
 　

 
24
1.62
1  1/2
32
475
mm.
914.4
69.9
692.2
701.5
106.4
616
 　

 
41.1
38.1
812.8
215

 

ANSI, ASME, ASA B16.5 600lb/sq.in. SOCKET WELD FLANGE RF
Nominal Size
  
Outside Diam.
Thick. of Flange
Diam. of Raised Face
Diam of Hub at Base
Length Thru Hub
Diam. of Bore
Depth of Socket
No. of Holes
Diam. of Holes
Diam. of Bolts
Diam. of Bolt Circle
Approx. Weight Pounds Kg
O
C
R
X
Y
B
D
1/2″
in.
3.75
0.56
1.38
1.5
0.88
0.88
0.38
4
0.62
1/2
2.62
2
mm.
95.3
14.2
35.1
38.1
22.4
22.4
9.7
15.7
12.7
66.5
1
3/4″
in.
4.62
0.62
1.69
1.88
1
1.09
0.44
4
0.75
5/8
3.25
3
mm.
117.3
15.7
42.9
47.8
25.4
27.7
11.2
19.1
15.9
82.6
1
1″
in.
4.88
0.69
2
2.12
1.06
1.36
0.5
4
0.75
5/8
3.5
4
mm.
124
17.5
50.8
53.8
26.9
34.5
12.7
19.1
15.9
88.9
2
1 1/4″
in.
5.25
0.81
2.5
2.5
1.12
1.7
0.56
4
0.75
5/8
3.88
5
mm.
133.4
20.6
63.5
63.5
28.4
43.2
14.2
19.1
15.9
98.6
2
1 1/2″
in.
6.12
0.88
2.88
2.75
1.25
1.95
0.62
4
0.88
3/4
4.5
7
mm.
155.4
22.4
73.2
69.9
31.8
49.5
15.7
22.4
19.1
114.3
3
2″
in.
6.5
1
3.62
3.31
1.44
2.44
0.69
8
0.75
5/8
5
9
mm.
165.1
25.4
91.9
84.1
36.6
62
17.5
19.1
15.9
127
4
2 1/2″
in.
7.5
1.12
4.12
3.94
1.62
2.94
0.75
8
0.88
3/4
5.88
13
mm.
190.5
28.4
104.6
100.1
41.1
74.7
19.1
22.4
19.1
149.4
6
3″
in.
8.25
1.25
5
4.62
1.81
3.57
0.81
8
0.88
3/4
6.62
16
mm.
209.6
31.8
127
117.3
46
90.7
20.6
22.4
19.1
168.1
7
3 1/2″
in.
9
1.38
5.5
5.25
1.94
4.07
 　

 
8
1
7/8
7.25
21
mm.
228.6
35.1
139.7
133.4
49.3
103.4
 　

 
25.4
22.2
184.2
10
4″
in.
10.75
1.5
6.19
6
2.12
4.57
 　

 
8
1
7/8
8.5
37
mm.
273.1
38.1
157.2
152.4
53.8
116.1
 　

 
25.4
22.2
215.9
17
5″
in.
13
1.75
7.31
7.44
2.38
5.66
 　

 
8
1.12
1
10.5
63
mm.
330.2
44.5
185.7
189
60.5
143.8
 　

 
28.4
25.4
266.7
29
6″
in.
14
1.88
8.5
8.75
2.62
6.72
 　

 
12
1.12
1
11.5
80
mm.
355.6
47.8
215.9
222.3
66.5
170.7
 　

 
28.4
25.4
292.1
36
8″
in.
16.5
2.19
10.62
10.75
3
8.72
 　

 
12
1.25
1 1/8
13.75
115
mm.
419.1
55.6
269.7
273.1
76.2
221.5
 　

 
31.8
28.6
349.3
52
10″
in.
20
2.5
12.75
13.5
3.38
10.88
 　

 
16
1.38
1 1/4
17
170
mm.
508
63.5
323.9
342.9
85.9
276.4
 　

 
35.1
31.8
431.8
77
12″
in.
22
2.62
15
15.75
3.62
12.88
 　

 
20
1.38
1  1/4
19.25
200
mm.
558.8
66.5
381
400.1
91.9
327.2
 　

 
35.1
31.8
489
91
14″
in.
23.75
2.75
16.25
17
3.69
14.14
 　

 
20
1.5
1 3/8
20.75
230
mm.
603.3
69.9
412.8
431.8
93.7
359.2
 　

 
38.1
34.9
527.1
104
16″
in.
27
3
18.5
19.5
4.19
16.16
 　

 
20
1.62
1 1/2
23.75
330
mm.
685.8
76.2
469.9
495.3
106.4
410.5
 　

 
41.1
38.1
603.3
150
18″
in.
29.25
3.25
21
21.5
4.62
18.18
 　

 
20
1.75
1 5/8
25.75
400
mm.
743
82.6
533.4
546.1
117.3
461.8
 　

 
44.5
41.3
654.1
181
20″
in.
32
3.5
23
24
5
20.2
 　

 
24
1.75
1 5/8
28.5
510
mm.
812.8
88.9
584.2
609.6
127
513.1
 　

 
44.5
41.3
723.9
231
24″
in.
37
4
27.25
28.25
5.5
24.25
 　

 
24
2
1 7/8
33
730
mm.
939.8
101.6
692.2
717.6
139.7
616
 　

 
50.8
47.6
838.2
331

 

ANSI, ASME, ASA B16.5 1500lb/sq.in. SOCKET WELD FLANGE RF
Nominal Size
  
Outside Diam.
Thick. of Flange
Diam. of Raised Face
Diam of Hub at Base
Length Thru Hub
Diam. of Bore
Depth of Socket
No. of Holes
Diam. of Holes
Diam. of Bolts
Diam. of Bolt Circle
Approx. Weight Pounds Kg
O
C
R
X
Y
B
D
1/2″
in.
4.75
0.88
1.38
1.5
1.25
0.88
0.38
4
0.88
3/4
3.25
4
mm.
120.7
22.4
35.1
38.1
31.8
22.4
9.7
22.4
19.1
82.6
2
3/4″
in.
5.12
1
1.69
1.75
1.38
1.09
0.44
4
0.88
3/4
3.5
5
mm.
130
25.4
42.9
44.5
35.1
27.7
11.2
22.4
19.1
88.9
2
1″
in.
5.88
1.12
2
2.06
1.62
1.36
0.5
4
1
7/8
4
8
mm.
149.4
28.4
50.8
52.3
41.1
34.5
12.7
25.4
22.2
101.6
4
1 1/4″
in.
6.25
1.12
2.5
2.5
1.62
1.7
0.56
4
1
7/8
4.38
9
mm.
158.8
28.4
63.5
63.5
41.1
43.2
14.2
25.4
22.2
111.3
4
1 1/2″
in.
7
1.25
2.88
2.75
1.75
1.95
0.62
4
1.12
1
4.88
12
mm.
177.8
31.8
73.2
69.9
44.5
49.5
15.7
28.4
25.4
124
5
2″
in.
8.5
1.5
3.62
4.12
2.25
2.44
0.69
8
1
7/8
6.5
25
mm.
215.9
38.1
91.9
104.6
57.2
62
17.5
25.4
22.2
165.1
11
2 1/2″
in.
9.  2
1.  2
4.  2
4.  8
2.5
2.  4
0.  5
8
1.  2
1
7.5
36
mm.
244.3
41.1
104.6
124
63.5
74.7
19.1
28.4
25.4
190.5
16
3″
in.
10.5
1.88
5
5.25
2.88
 　

 
 　

 
8
1.25
1 1/8
8
48
mm.
266.7
47.8
127
133.4
73.2
 　

 
 　

 
31.8
28.6
203.2
22
4″
in.
12.25
2.12
6.19
6.38
3.56
 　

 
 　

 
8
1.38
1 1/4
9.5
73
mm.
311.2
53.8
157.2
162.1
90.4
 　

 
 　

 
35.1
31.8
241.3
33
5″
in.
14.75
2.88
7.31
7.75
4.12
 　

 
 　

 
8
1.62
1 1/2
11.5
130
mm.
374.7
73.2
185.7
196.9
104.6
 　

 
 　

 
41.1
38.1
292.1
59
6″
in.
15.5
3.25
8.5
9
4.69
 　

 
 　

 
12
1.5
1 3/8
12.5
165
mm.
393.7
82.6
215.9
228.6
119.1
 　

 
 　

 
38.1
34.9
317.5
75
8″
in.
19
3.62
10.62
11.5
5.62
 　

 
 　

 
12
1.75
1 5/8
15.5
260
mm.
482.6
91.9
269.7
292.1
142.7
 　

 
 　

 
44.5
41.3
393.7
118
10″
in.
23
4.25
12.75
14.5
6.25
 　

 
 　

 
12
2
1 7/8
19
435
mm.
584.2
108
323.9
368.3
158.8
 　

 
 　

 
50.8
47.6
482.6
197
12″
in.
26.5
4.88
15
17.75
7.12
 　

 
 　

 
16
2.12
2
22.5
580
mm.
673.1
124
381
450.9
180.8
 　

 
 　

 
53.8
50.8
571.5
263
14″
in.
29.5
5.25
16.25
19.5
 　

 
 　

 
 　

 
16
2.38
2 1/4
25
 　

 
mm.
749.3
133.4
412.8
495.3
 　

 
 　

 
 　

 
60.5
57.2
635
 　

 
16″
in.
32.5
5.75
18.5
21.75
 　

 
 　

 
 　

 
16
2.62
2 1/2
27.75
 　

 
mm.
825.5
146.1
469.9
552.5
 　

 
 　

 
 　

 
66.5
63.5
704.9
 　

 
18″
in.
36
6.38
21
23.5
 　

 
 　

 
 　

 
16
2.88
2 3/4
30.5
 　

 
mm.
914.4
162.1
533.4
596.9
 　

 
 　

 
 　

 
73.2
69.9
774.7
 　

 
20″
in.
38.75
7
23
25.25
 　

 
 　

 
 　

 
16
3.12
3
32.75
 　

 
mm.
984.3
177.8
584.2
641.4
 　

 
 　

 
 　

 
79.2
76.2
831.9
 　

 
24″
in.
46
8
27.25
30
 　

 
 　

 
 　

 
16
3.62
3  1/2
39
 　

 
mm.
1168.4
203.2
692.2
762
 　

 
 　

 
 　

 
91.9
88.9
990.6