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Inner Ring Dimensions Pipes Under 24"
    










 

Part Numbers
 Winding Materials
 Temp. Range
 Stainless Steel 304
-200°C
to
420°C
 Stainless Steel 316L
-200°C
to
460°C
 Filler Materials
 Graphite
Up
to
460°C
 PTFE
Up
to
500°C
 Centering Ring
 Carbon Steel
Up
to
538°C
 Inner Ring Materials
 Stainless Steel 304
-200°C
to
420°C
 Stainless Steel 316
-200°C
to
460°C
  * Stainless steel 316 and 304 can exceed their continuous operating temperatures, up to 760°C, for short‒term intervals. However, this may result in intergranular corrosion. For more information, please consult a Hi-Tech Seals representative.
Standard inside diameter of inner rings for SWG

Nom
Pipe Size
Pressure Class
150
300
400
600
900
1500
2500
1/2
0.56
0.56
0.56
0.56
0.56
0.56
0.56
3/4
0.81
0.81
0.81
0.81
0.81
0.81
0.81
1
1.06
1.06
1.06
1.06
1.06
1.06
1.06
1 1/4
1.50
1.50
1.50
1.50
1.31
1.31
1.31
1 1/2
1.75
1.75
1.75
1.75
1.63
1.63
1.63
2
2.19
2.19
2.19
2.19
2.06
2.06
2.06
2 1/2
2.62
2.62
2.62
2.62
2.50
2.50
2.50
3
3.19
3.19
3.19
3.19
3.10
3.10
3.10
4
4.19
4.19
4.04
4.04
4.04
3.85
3.85
5
5.19
5.19
5.05
5.05
5.05
4.90
4.90
6
6.19
6.19
6.10
6.10
6.10
5.80
5.80
8
8.50
8.50
8.10
8.10
7.75
7.75
7.75
10
10.56
10.56
10.05
10.05
9.69
9.69
9.69
12
12.50
12.50
12.10
12.10
11.50
11.50
11.50
14
13.75
13.75
13.50
13.50
12.63
12.63
–
16
15.75
15.75
15.35
15.35
14.75
14.50
–
18
17.69
17.69
17.25
17.25
16.75
16.75
–
20
19.69
19.69
19.25
19.25
19.00
18.75
–
24
23.75
23.75
23.25
23.25
23.25
22.75
–


Series B Flanges 26" and Over

Nom
Pipe Size
Class 75
  
Class 150
    
Class 300
  
Sealing Element
Sealing Element
Sealing Element
I.D.
O.D.
Centering Ring O.D.
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
26
26 - 1/4
27
27 - 7/8
25 - 3/4
26 - 1/2
27 - 1/2
28 - 9/16
25 - 3/4
26 - 1/2
28
30 - 3/8
28
28 - 1/4
29 - 1/8
29 - 7/8
27 - 3/4
28 - 1/2
29 - 1/2
30 - 9/16
27 - 3/4
28 - 1/2
30
32 - 1/2
30
30 - 1/4
31 - 1/8
31 - 7/8
29 - 3/4
30 - 1/2
31 - 1/2
32 - 9/16
29 - 3/4
30 - 1/2
32
34 - 7/8
32
32 - 1/4
33 - 1/8
33 - 7/8
31 - 3/4
32 - 1/2
33 - 1/2
34 - 11/16
31 - 3/4
32 - 1/2
34
37
34
34 - 1/4
35 - 1/8
35 - 7/8
33 - 3/4
34 - 1/2
35 - 3/4
36 - 13/16
33 - 3/4
34 - 1/2
36
39 - 1/8
36
36 - 1/4
37 - 1/4
38 - 5/16
35 - 3/4
36 - 1/2
37 - 3/4
38 - 7/8
35 - 3/4
36 - 1/2
38
41 - 1/4
38
–
–
–
37 - 3/4
38 - 3/8
39 - 3/4
41 - 1/8
38 - 1/4
39 - 3/4
41 - 1/4
43 - 1/4
40
–
–
–
39 - 3/4
40 - 1/4
41 - 7/8
43 - 1/8
40 - 1/4
41 - 3/4
43 - 1/4
45 - 1/4
42
42 - 1/4
43 - 1/4
44 - 5/16
41 - 3/4
42 - 1/2
43 - 7/8
45 - 1/8
42 - 3/4
43 - 3/4
45 - 1/4
47 - 1/4
44
–
–
–
43 - 3/4
44 - 1/4
45 - 7/8
47 - 1/8
44 - 1/4
45 - 3/4
47 - 1/4
49 - 1/4
46
–
–
–
45 - 3/4
46 - 1/2
48 - 3/16
49 - 7/16
46 - 3/8
47 - 7/8
49 - 3/8
51 - 7/8
48
48 - 3/8
49 - 1/2
50 - 1/2
47 - 3/4
48 - 1/2
50
51 - 7/16
48 - 1/2
49 - 3/4
51 - 5/8
53 - 7/8
50
–
–
–
49 - 3/4
50 - 1/2
52 - 3/16
53 - 7/16
49 - 7/8
51 - 7/8
53 - 3/8
55 - 7/8
52
–
–
–
51 - 3/4
52 - 1/2
54 - 3/16
55 - 7/16
51 - 7/8
53 - 7/8
55 - 3/8
57 - 7/8
54
54 - 3/8
55 - 5/8
56 - 5/8
53 - 3/4
54 - 1/2
56
57 - 5/8
53 - 3/4
55 - 1/4
57 - 1/4
60 - 1/4
56
–
–
–
56
56 - 7/8
58 - 3/16
59 - 5/8
56 - 1/4
58 - 1/4
60
62 - 3/4
58
–
–
–
58 - 3/16
59 - 1/16
60 - 3/16
62 - 3/16
58 - 7/16
60 - 7/16
61 - 15/16
65 - 3/16
60
60 - 1/2
61 - 3/4
62 - 7/8
60 - 7/16
61 - 5/16
62 - 7/16
64 - 3/16
61 - 5/16
62 - 9/16
64 - 3/16
67 - 3/16


Nom
Pipe Size
  
Class 400
  
Class 600
    
Class 900
  
Sealing Element
Sealing Element
Sealing Element
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
26
25 - 3/4
26 - 1/4
27 - 1/2
29 - 3/8
25 - 3/8
26 - 1/8
28 - 1/8
30 - 1/8
26 - 1/4
27 - 1/4
29 - 1/2
33
28
27 - 5/8
28 - 1/8
29 - 1/2
31 - 1/2
27
27 - 3/4
29 - 3/4
32 - 1/4
28 - 1/4
29 - 1/4
31 - 1/2
35 - 1/2
30
29 - 5/8
30 - 1/8
31 - 3/4
33 - 3/4
29 - 5/8
30 - 5/8
32 - 5/8
34 - 5/8
30 - 3/4
31 - 3/4
33 - 3/4
37 - 3/4
32
31 - 1/2
32
33 - 7/8
35 - 7/8
31 - 1/4
32 - 3/4
34 - 3/4
36 - 3/4
33
34
36
40
34
33 - 1/2
34 - 1/8
35 - 7/8
37 - 7/8
33 - 1/2
35
37
39 - 1/4
35 - 1/4
36 - 1/4
38 - 1/4
42 - 1/4
36
35 - 3/8
36 - 1/8
38
40 - 1/4
35 - 1/2
37
39
41 - 1/4
36 - 1/4
37 - 1/4
39 - 1/4
44 - 1/4
38
37 - 1/2
38 - 1/4
40 - 1/4
42 - 1/4
37 - 1/2
39
41
43 - 1/2
39 - 3/4
40 - 3/4
42 - 3/4
47 - 1/4
40
39 - 3/8
40 - 3/8
42 - 3/8
44 - 3/8
39 - 3/4
41 - 1/4
43 - 1/4
45 - 1/2
41 - 3/4
43 - 1/4
45 - 1/4
49 - 1/4
42
41 - 3/8
42 - 3/8
44 - 3/8
46 - 3/8
42
43 - 1/2
45 - 1/2
48
43 - 3/4
45 - 1/4
47 - 1/4
51 - 1/4
44
43 - 1/2
44 - 1/2
46 - 1/2
48 - 1/2
43 - 3/4
45 - 3/4
47 - 3/4
50
45 - 1/2
47 - 1/2
49 - 1/2
53 - 7/8
46
46
47
49
50 - 3/4
45 - 3/4
47 - 3/4
49 - 3/4
52 - 1/4
48
50
52
56 - 1/2
48
47 - 1/2
49
51
53
48
50
52
54 - 3/4
50
52
54
58 - 1/2
50
49 - 1/2
51
53
55 - 1/4
50
52
54
57
–
–
–
–
52
51 - 1/2
53
55
57 - 1/4
52
54
56
59
–
–
–
–
54
53 - 1/4
55 - 1/4
57 - 1/4
59 - 3/8
54 - 1/4
56 - 1/4
58 - 1/4
61 - 1/4
–
–
–
–
56
55 - 1/4
57 - 1/4
59 - 1/4
61 - 3/4
56 - 1/4
58 - 1/4
60 - 1/4
63 - 1/2
–
–
–
–
58
57 - 1/4
59 - 3/4
61 - 1/4
63 - 3/4
58
60 - 1/2
62 - 1/2
65 - 1/2
–
–
–
–
60
59 - 3/4
61 - 3/4
63 - 3/4
66 - 1/4
60 - 1/4
62 - 3/4
64 - 3/4
68 - 1/4
–
–
–
–


Series A Flanges 22" and Over

Nom
Pipe Size
  
Class 150
  
Class 300
    
Class 400
  
Sealing Element
Sealing Element
Sealing Element
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
22
–
22 - 3/4
24
26
–
22 - 3/4
24 - 3/4
27 - 3/4
–
22 - 3/4
24 - 3/4
27 - 5/8
26
25 - 3/4
26 - 1/2
27 - 3/4
30 - 1/2
25 - 3/4
27
29
32 - 7/8
26
27
29
32 - 3/4
28
27 - 3/4
28 - 1/2
29 - 3/4
32 - 3/4
27 - 3/4
29
31
35 - 3/8
28
29
31
35 - 1/8
30
29 - 3/4
30 - 1/2
31 - 3/4
34 - 3/4
29 - 3/4
31 - 1/4
33 - 1/4
37 - 1/2
29 - 3/4
31 - 1/4
33 - 1/4
37 - 1/4
32
31 - 3/4
32 - 1/2
33 - 7/8
37
31 - 3/4
33 - 1/2
35 - 1/2
39 - 5/8
32
33 - 1/2
35 - 1/2
39 - 1/2
34
33 - 3/4
34 - 1/2
35 - 7/8
39
33 - 3/4
35 - 1/2
37 - 1/2
41 - 5/8
34
35 - 1/2
37 - 1/2
41 - 1/2
36
35 - 3/4
36 - 1/2
38 - 1/8
41 - 1/4
35 - 3/4
37 - 5/8
39 - 5/8
44
36 - 1/8
37 - 5/8
39 - 5/8
44
38
37 - 3/4
38 - 1/2
40 - 1/8
43 - 3/4
37 - 1/2
38 - 1/2
40
41 - 1/2
37 - 1/2
38 - 1/4
40 - 1/4
42 - 1/4
40
39 - 3/4
40 - 1/2
42 - 1/8
45 - 3/4
39 - 1/2
40 - 1/4
42 - 1/8
43 - 7/8
39 - 3/8
40 - 3/8
42 - 3/8
44 - 3/8
42
41 - 3/4
42 - 1/2
44 - 1/4
48
41 - 1/2
42 - 1/4
44 - 1/8
45 - 7/8
41 - 3/8
42 - 3/8
44 - 3/8
46 - 3/8
44
43 - 3/4
44 - 1/2
46 - 3/8
50 - 1/4
43 - 1/2
44 - 1/2
46 - 1/2
48
43 - 1/2
44 - 1/2
46 - 1/2
48 - 1/2
46
45 - 3/4
46 - 1/2
48 - 3/8
52 - 1/4
45 - 3/8
46 - 3/8
48 - 3/8
50 - 1/8
46
47
49
50 - 3/4
48
47 - 3/4
48 - 1/2
50 - 3/8
54 - 1/2
47 - 5/8
48 - 5/8
50 - 5/8
52 - 1/8
47 - 1/2
49
51
53
50
49 - 3/4
50 - 1/2
52 - 1/2
56 - 1/2
49
51
53
54 - 1/4
49 - 1/2
51
53
55 - 1/4
52
51 - 3/4
52 - 1/2
54 - 1/2
58 - 3/8
52
53
55
56 - 1/4
51 - 1/2
53
55
57 - 1/4
54
53 - 1/2
54 - 1/2
56 - 1/2
61
53 - 1/4
55 - 1/4
57 - 1/4
58 - 3/4
53 - 1/4
55 - 1/4
57 - 1/4
59 - 3/4
56
55 - 1/2
56 - 1/2
58 - 1/2
63 - 1/4
55 - 1/4
57 - 1/4
59 - 1/4
60 - 3/4
55 - 1/4
57 - 1/4
59 - 1/4
61 - 3/4
58
57 - 1/2
58 - 1/2
60 - 1/2
65 - 1/2
57
59 - 1/2
61 - 1/2
62 - 3/4
57 - 1/4
59 - 1/4
61 - 1/4
63 - 3/4
60
59 - 1/2
60 - 1/2
62 - 1/2
67 - 1/2
60
61 - 1/2
63 - 1/2
64 - 3/4
59 - 3/4
61 - 3/4
63 - 3/4
66 - 1/4



Nom
Pipe Size
  
Class 600
  
Class 900
  
Sealing Element
Sealing Element
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
Inner Ring I.D.
I.D.
O.D.
Centering Ring O.D.
22
–
22 - 3/4
24 - 3/4
28 - 7/8
–
–
–
–
26
25 - 1/2
27
29
34 - 1/8
26
27
29
34 - 3/4
28
27 - 1/2
29
31
36
28
29
31
37 - 1/4
30
29 - 3/4
31 - 1/4
33 - 1/4
38 - 1/4
30 - 1/4
31 - 1/4
33 - 1/4
39 - 3/4
32
32
33 - 1/2
35 - 1/2
40 - 1/4
32
33 - 1/2
35 - 1/2
42 - 1/4
34
34
35 - 1/2
37 - 1/2
42 - 1/4
34
35 - 1/2
37 - 1/2
44 - 3/4
36
36 - 1/8
37 - 5/8
39 - 5/8
44 - 1/2
36 - 1/4
37 - 3/4
39 - 3/4
47 - 1/4
38
37 - 1/2
39
41
43 - 1/2
39 - 3/4
40 - 3/4
42 - 3/4
47 - 1/4
40
39 - 3/4
41 - 1/4
43 - 1/4
45 - 1/2
41 - 3/4
43 - 1/4
45 - 1/4
49 - 1/4
42
42
43 - 1/2
45 - 1/2
48
43 - 3/4
45 - 1/4
47 - 1/2
51 - 1/4
44
43 - 3/4
45 - 3/4
47 - 3/4
50
45 - 1/2
47 - 1/2
49 - 1/2
53 - 7/8
46
45 - 3/4
47 - 3/4
49 - 3/4
52 - 1/4
48
50
52
56 - 1/2
48
48
50
52
54 - 3/4
50
52
54
58 - 1/2
50
50
52
54
57
–
–
–
–
52
52
54
56
59
–
–
–
–
54
54 - 1/4
56 - 1/4
58 - 1/4
61 - 1/4
–
–
–
–
56
56 - 1/4
58 - 1/4
60 - 1/4
63 - 1/2
–
–
–
–
58
58
60 - 1/2
62 - 1/2
65 - 1/2
–
–
–
–
60
60 - 1/4
62 - 3/4
64 - 3/4
68 - 1/4
–
–
–
–