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Pioneer Gasket Manufacturing Company
(ISO 9001 : 2015 CERTIFIED)

Gaskets Size Chart

Ring Gaskets for 125/150# ANSI Pipe Flanges | Ring Gaskets for 250/300# ANSI Pipe Flanges | Full Face Gaskets for 125/150# ANSI Flanges | Full Face Gaskets for 250/300# ANSI Flanges | Dimensions for API Standard 605 (Class A) - 150# Flanges

Ring Gaskets for 125/150# ANSI Pipe Flanges

Nominal Pipe
Size
ID
OD
1/2"
27/32
1-7/8
3/4"
1-1/16
2-1/4
1"
1-5/16
2-5/8
1-1/4"
1-21/32
3
1-1/2"
1-29/32
3-3/8
2"
2-3/8
4-1/8
2-1/2"
2-7/8
4-7/8
3"
3-1/2
5-3/8
3-1/2"
4
6-3/8
4"
4-1/2
6-7/8
4-1/2"
5
7
5"
5-9/16
7-3/4
6"
6-5/8
8-3/4
7"
7-5/8
10
8"
8-5/8
11
10"
10-3/4
13-3/8
12"
12-3/4
16-1/8
14"
14
17-3/4
16"
16
20-1/4
18"
18
21-5/8
20"
20
23-7/8
Nominal Pipe
Size
ID
OD
22"
22
26
24"
24
28-1/4
26"
26
30-1/2
28"
28
32-3/4
30"
30
34-3/4
32"
32
37
34"
34
39
36"
36
41-1/4
38"
38
43-5/8
40"
40
45-5/8
42"
42
48
46"
46
52-1/8
48"
48
54-1/2
50"
50
56-1/2
52"
52
58-3/4
54"
54
61
60"
60
67-1/2
66"
66
74-1/4
72"
72
80-3/4
84"
84
93-1/2
96"
96
106-1/4

Ring Gaskets for 250/300# ANSI Pipe Flanges

Nominal Pipe
Size
ID
OD
1/2"
27/32
2-1/8
3/4"
1-1/16
2-5/8
1"
1-5/16
2-7/8
1-1/4"
1-21/32
3-1/4
1-1/2"
1-29/32
3-3/4
2"
2-3/8
4-3/8
2-1/2"
2-7/8
5-1/8
3"
3-1/2
5-7/8
3-1/2"
4
6-1/2
4"
4-1/2
7-1/8
4-1/2"
5
7-5/8
5"
5-9/16
8-1/2
6"
6-5/8
9-7/8
7"
7-5/8
10-7/8
Nominal Pipe
Size
ID
OD
8"
8-5/8
12-1/8
10"
10-3/4
14-1/4
12"
12-3/4
16-5/8
14"
14
19-1/8
15"
15
20-1/8
16"
16
21-1/4
18"
18
23-1/2
20"
20
25-3/4
22"
22
27-5/8
24"
24
30-1/2
30"
30
37-1/2
36"
36
44
42"
42
50-3/4
48"
48
58-3/4

Full Face Gaskets for 125/150# ANSI Flanges

Nominal Pipe Size
Gasket ID
Gasket OD
Number of Bolt Holes
Bolt Hole Diameter
Bolt Circle
1/2"
13/16
3-1/2
4
5/8
2-3/8
3/4"
1-1/16
3-7/8
4
5/8
2-3/4
1"
1-5/16
4-1/4
4
5/8
3-1/8
1-1/4"
1-5/8
4-5/8
4
5/8
3-1/2
1-1/2"
1-7/8
5
4
5/8
3-7/8
2"
2-3/8
6
4
3/4
4-3/4
2-1/2"
2-7/8
7
4
3/4
5-1/2
3"
3-1/2
7-1/2
4
3/4
6
3-1/2"
4
8-1/2
8
3/4
7
4"
4-1/2
9
8
3/4
7-1/2
5"
5-9/16
10
8
7/8
8-1/2
6"
6-5/8
11
8
7/8
9-1/2
8"
8-5/8
13-1/2
8
7/8
11-3/4
10"
10-3/4
16
12
1
14-1/4
12"
12-3/4
19
12
1
17
14"
14
21
12
1-1/8
18-3/4
16"
16
23-1/2
16
1-1/8
21-1/4
18"
18
25
16
1-1/4
22-3/4
20"
20
27-1/2
20
1-1/4
25
22"
22
29-1/2
20
1-3/8
27-1/4
24"
24
32
20
1-3/8
29-1/2
26"
26
34-1/4
24
1-3/8
31-3/4
28"
28
36-1/2
28
1-3/8
34
30"
30
38-3/4
28
1-3/8
36
32"
32
41-3/4
28
1-5/8
38-1/2
34"
34
43-3/4
32
1-5/8
40-1/2
36"
36
46
32
1-5/8
42-3/4
38"
38
48-3/4
32
1-5/8
45-1/4
40"
40
50-3/4
36
1-5/8
47-1/4
42"
42
53
36
1-5/8
49-1/2
44"
44
55-1/4
40
1-5/8
51-3/4
46"
46
57-1/4
40
1-5/8
53-3/4
48"
48
59-1/2
44
1-5/8
56
50"
50
61-3/4
44
1-7/8
58-1/4
52"
52
64
44
1-7/8
60-1/2
54"
54
66-1/4
44
1-7/8
62-3/4
60"
60
73
52
1-7/8
69-1/4
66"
66
80
52
1-7/8
76
72"
72
86-1/2
60
1-7/8
82-1/2
84"
84
99-3/4
64
2-1/8
95-1/2
96"
96
113-1/4
68
2-3/8
108-1/2

Full Face Gaskets for 250/300# ANSI Flanges

Nominal Pipe
Size
Gasket
ID
Gasket
OD
Number of
Bolt Holes
Bolt Hole
Diameter
Bolt
Circle
1"
1-5/16
4-7/8
4
3/4
3-1/2
1-1/4"
1-21/32
5-1/4
4
3/4
3-7/8
1-1/2"
1-29/32
6-1/8
4
7/8
4-1/2
2"
2-3/8
6-1/2
8
3/4
5
2-1/2"
2-7/8
7-1/2
8
7/8
5-7/8
3"
3-1/2
8-1/4
8
7/8
6-5/8
3-1/2"
4
9
8
7/8
7-1/4
4"
4-1/2
10
8
7/8
7-7/8
5"
5-9/16
11
8
7/8
9-1/4
6"
6-5/8
12-1/2
12
7/8
10-5/8
8"
8-5/8
15
12
1
13
10"
10-3/4
17-1/2
16
1-1/8
15-1/4
12"
12-3/4
20-1/2
16
1-1/4
17-3/4
14"
14
23
20
1-1/4
20-1/4
16"
16
25-1/2
20
1-3/8
22-1/2
18"
18
28
24
1-3/8
24-3/4
20"
20
30-1/2
24
1-3/8
27
22"
22
33
24
1-5/8
29-1/4
24"
24
36
24
1-5/8
32
26"
26
38-1/4
28
1-7/8
34-1/2
28"
28
40-3/4
28
1-7/8
37
30"
30
43
28
1-7/8
39-1/4
32"
32
45-1/4
28
1-7/8
41-1/2
34"
34
47-1/2
28
1-7/8
43-1/2
36"
36
50
32
2-1/8
46
38"
38
52-1/4
32
2-1/8
48
40"
40
54-1/2
36
2-1/8
50-1/4
42"
42
57
36
2-1/8
52-3/4
44"
44
59-1/4
36
2-1/8
55
46"
46
61-1/2
40
2-1/8
57-1/4
48"
48
65
40
2-1/8
60-3/4

Dimensions for API Standard 605 (Class A) - 150# Flanges

Nominal Pipe
Size
Flange
OD
Raised Face
Diameter
Ring Gasket
OD
Number of Bolt
Holes
Bolt Hole
Diameter
Bolt
Circle
26"
30.94
28.00
28.56
36
0.88
29.31
28"
32.94
30.00
30.56
40
0.88
31.31
30"
34.94
32.00
32.56
44
0.88
33.31
32"
37.06
34.00
34.68
48
0.88
35.44
34"
39.56
36.25
36.81
40
1.00
37.69
36"
41.62
38.25
38.88
44
1.00
39.75
38"
44.25
40.25
41.13
40
1.12
42.12
40"
46.25
42.50
43.13
44
1.12
44.12
42"
48.25
44.50
45.13
48
1.12
46.12
44"
50.25
46.50
47.13
52
1.12
48.12
46"
52.81
48.62
49.44
40
1.25
50.56
48"
54.81
50.75
51.44
44
1.25
52.56
50"
56.81
52.75
53.44
48
1.25
54.56
52"
58.81
54.75
55.44
52
1.25
56.56
54"
61.00
56.75
57.63
56
1.25
58.75
56"
63.00
58.75
59.63
60
1.25
60.75
58"
65.94
60.75
62.19
48
1.38
63.44
60"
67.94
63.00
64.19
52
1.38
65.44
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