2000 Hook-up Book
ANSI Flange Standards
Table 37: ANSI Flange Standards All Dimensions are in Inches
SYSTEM DESIGN Pipe Size
1/2 3/4 1 1 1 / 4
1
1 /
2 2
1 /
3 3
1 /
4 5 6 8 10 12
2
2
2
125 lb CAST IRON – ANSI Diameter of Flange Thickness of Flange (min) 1 Diameter of Bolt Circle
– – 4 1 / 4
4 1 / 3
5 /
5 6 7 7 1 / 2
8
1 /
9 10 11 13 1 / 2
16 19
8
2
– –
7 /
9 / 3
5 / 4
11 /
3 /
13 /
15 /
15 /
1 1
1 /
1
3 /
1
1 /
16
2
16 7 /
8
16
4
16
16
16
8
16 1 /
4
– – 3 1 / 8
1 /
3 /
5
1 /
6 7 7 1 / 2
8
1 /
9
1 /
11
3 /
14
17
2
8
4
2
2
2
4
4
Number of Bolts Diameter of Bolts
– – 4 4 4 4 4 4 8 8 8 8 8 12 12
– –
1 /
1 /
1 /
5 /
5 /
5 /
5 /
5 /
3 /
3 /
3 /
7 /
7 /
2
2
2
8
8
8
8
8
4
4
4
8
8
1 125 lb flanges have plain faces. 250 lb CAST IRON – ANSI Diameter of Flange Thickness of Flange (min) 2 Diameter of Raised Face Diameter of Bolt Circle
– – 4 7 / 8
5 3 / 3 3
1 /
6
1 /
6 7 / 4
1 /
7
1 /
8
1 / 1 /
9 10 11 12 1 / 2
15 17
1 /
20
1 /
4
8
2
2
4
2
2
– –
11 /
13 /
1 1
1 6 7
3 / 5 / 1 /
1 6 7
1 /
1 8 9
3 / 5 / 1 /
1 9
7 /
1
5 /
1
7 /
2
16
4
16
8
8
16
4
8
16
8
8
– – 2 11 / 16 – – 3 1 / 2
1 / 7 /
3 4
9 / 1 /
3 /
4
15 /
5 6
11 /
15 /
11 /
11
15 /
16 14
1 / 1 /
16 17
7 / 3 /
16
16
16
16
16
16
16
16
16
16
16
5 5
7 /
5 /
7 /
10
5 /
13 15
8
2
8
8
4
8
4
8
4
4
Number of Bolts Diameter of Bolts
– – 4 4 4 8 8 8 8 8 8 12 12 16 16
– –
5 /
5 /
3 /
5 /
3 /
3 /
3 /
3 /
3 /
3 /
7 /
1 1
1 /
8
8
4
8
4
4
4
4
4
4
8
8
2 250 lb flanges have a 1/16” raised face which is included in the flange thickness dimensions. 150 lb BRONZE – ANSI Diameter of Flange 3 1 / 2 3 7 / 8 4 1 / 4 4 5 / 8
5 6 7 7 1 / 2
8
1 /
9 10 11 13 1 / 2
16 19 1 1 1 /
2
Thickness of Flange (min) 3 Diameter of Bolt Circle
5 /
11 /
3 / 3
13 /
7 / 3
1 / 4
9 / 5
5 /
11 /
11 /
3 / 8
13 /
15 /
16
32
8
32
16 7 /
2
16 1 /
8
16
16
4
16
16
16
2 3 /
2
3 /
1 /
3
1 /
3 /
6 7 7 1 / 2
1 /
9
1 /
11
3 /
14
1 /
17
8
4
8
2
8
4
2
2
2
4
4
Number of Bolts Diameter of Bolts
4 4 4 4 4 4 4 4 8 8 8 8 8 12 12
1 /
1 /
1 /
1 /
1 /
5 /
5 /
5 /
5 /
5 /
3 /
3 /
3 /
7 /
7 /
2
2
2
2
2
8
8
8
8
8
4
4
4
8
8
3 150 lb bronze flanges have plain faces with two concentric gasket-retaining grooves between the port and the bolt holes. 300 lb BRONZE – ANSI Diameter of Flange 3 3 / 4 4 5 / 8 4 7 / 8 5 1 / 4 6 1 / 8 6 1 / 2 7 1 / 2 8 1 / 4
9 10 11 12 1 / 2
15 – –
Thickness of Flange (min) 4 Diameter of Bolt Circle
1 /
17 /
19 /
5 / 3
11 /
3 /
13 /
29 /
31 /
1 7
1 / 7 /
1 9
1 / 1 /
1
3 /
1
3 /
– –
2
32
32
8
16
4
16
32
32
16
8
16 5 /
8
2 5 /
3
1 /
3
1 /
7 /
4
1 /
5 5
7 /
6
5 /
7
1 /
10
13 – –
8
4
2
8
2
8
8
4
8
4
8
Number of Bolts Diameter of Bolts
4 4 4 4 4 8 8 8 8 8 8 12 12 – –
1 /
5 /
5 /
5 /
3 /
5 /
3 /
3 /
3 /
3 /
3 /
3 /
7 /
– –
2
8
8
8
4
8
4
4
4
4
4
4
8
4 300 lb bronze flanges have plain faces with two concentric gasket-retaining grooves between the port and the bolt holes. 150 lb STEEL – ANSI Diameter of Flange 3 1 / 2 3 7 / 8 4 1 / 4 4 5 / 8 5 6 7 7 1 / 2 8 1 / 2
9 10 11 13 1 / 2
16 19
Thickness of Flange (min) 5 Diameter of Raised Face Diameter of Bolt Circle
– –
7 /
1 /
9 / 2 3
5 / 3 4
11 /
3 /
13 /
15 /
15 /
1 1
1 /
1
3 /
1
1 /
16
2
16 7 / 7 /
8
16
4
16
16
16
8
16 3 / 1 /
4
1 3 / 2 3 /
1 2
11 /
2 2
1 / 1 /
5 / 3 /
4 5
1 / 1 /
5 5
1 /
6
3 /
7 8
5 / 1 /
8 9
1 / 1 /
10 11
5 /
12 14
15 17
8
16
2
8
8
8
2
16
16
2
8
4
3 /
3
1 /
3
6 7 7 1 / 2
3 /
8
4
8
2
8
4
2
2
2
4
4
Number of Bolts Diameter of Bolts
4 4 4 4 4 4 4 4 8 8 8 8 8 12 12
1 /
1 /
1 /
1 /
1 /
5 /
5 /
5 /
5 /
5 /
3 /
3 /
3 /
7 /
7 /
2
2
2
2
2
8
8
8
8
8
4
4
4
8
8
5 150 lb steel flanges have a 1/16”raised face which is included in the flange thickness dimensions. 300 lb STEEL – ANSI Diameter of Flange 3 3 / 4 4 5 / 8 4 7 / 8 5 1 / 4 6 1 / 8 6 1 / 2 7 1 / 2 8 1 / 4
9 10 11 12 1 / 2
15 17
1 /
20
1 /
2
2
Thickness of Flange (min) 6 Diameter of Raised Face Diameter of Bolt Circle
– –
11 /
3 /
13 /
7 / 3
1 1
1 /
1
3 / 1 / 1 /
1 6 7
1 / 3 / 7 /
1 7 9
3 / 5 / 1 /
1 8
7 / 1 /
1
5 /
1
7 /
2
16
4
16
8
8
16
4
8
16
8
8
1 3 / 2 5 /
1 3
11 /
2 2
1 / 7 /
2 4
7 /
5 /
4
1 / 7 /
5 5
10
5 /
12
3 / 1 /
15 17
8
16
2
8
8
8
2
16
16
2
8
4
1 /
3
1 /
3
1 /
5 5
6
5 /
7
10
5 /
13 15
3 /
8
4
2
8
2
8
8
4
8
4
8
4
4
Number of Bolts Diameter of Bolts
4 4 4 4 4 8 8 8 8 8 8 12 12 16 16
1 /
5 /
5 /
5 /
3 /
5 /
3 /
3 /
3 /
3 /
3 /
3 /
7 /
1 1
1 /
2
8
8
8
4
8
4
4
4
4
4
4
8
8
6 300 lb steel flanges have a 1/16” raised face which is included in the flange thickness dimensions. 400 lb STEEL – ANSI Diameter of Flange 3 3 / 4 4 5 / 8 4 7 / 8 5 1 / 4 6 1 / 8 6 1 / 2 7 1 / 2 8 1 / 4
9 10 11 12 1 / 2
15 17
1 /
20
1 /
2
2
Thickness of Flange (min) 7 Diameter of Raised Face Diameter of Bolt Circle
9 /
5 / 1 3
11 /
13 /
7 / 2 4
1 1
1 / 1 / 7 /
1
1 /
1
3 / 1 / 1 /
1 6 7
3 / 3 / 7 /
1 7 9
1 / 5 / 1 /
1 8
5 / 1 /
1
7 /
2
1 /
2
1 /
16
8
16
16
8
8
4
8
8
2
8
8
8
4
1 3 / 2 5 /
11 /
2 2
1 / 7 /
7 / 1 /
3
5 /
4
5 5
10
5 /
12
3 / 1 /
15 17
8
16
2
8
8
8
2
16
16
2
8
4
1 /
3
1 /
3
5 5
6
5 /
7
10
5 /
13 15
3 /
8
4
2
8
2
8
8
4
8
4
8
4
4
Number of Bolts Diameter of Bolts
4 4 4 4 4 8 8 8 8 8 8 12 12 16 16
1 /
5 /
5 /
5 /
3 /
5 /
3 /
3 /
7 /
7 /
7 /
7 /
1 1
1 /
1
1 /
2
8
8
8
4
8
4
4
8
8
8
8
8
4
7 400 lb steel flanges have a 1/4” raised face which is NOT included in the flange thickness dimensions. 600 lb STEEL – ANSI Diameter of Flange 3 3 / 4 4 5 / 8 4 7 / 8 5 1 / 4 6 1 / 8 6 1 / 2 7 1 / 2 8 1 / 4
9 10
3 /
13 14 16 1 / 2
20 22
4
Thickness of Flange (min) 8 Diameter of Raised Face Diameter ofBolt Circle
9 /
5 /
11 / 16
13 /
7 / 2 4
1 1
1 / 1 / 7 /
1
1 /
1
3 / 1 / 1 /
1 6 8
1 / 3 / 1 /
1 7
3 / 5 /
1 8
7 / 1 /
2
3 /
2
1 /
2
5 /
16
8
16
8
8
4
8
2
4
8
16 5 / 3 /
2
8
1 3 / 2 5 /
1 11 / 16 2 2 1 / 2
7 / 1 /
3
5 /
4
5 5
10 13
12
3 /
15
8
8
8
8
2
16
16 1 /
2
8
4
3
1 /
3
1 /
3
7 /
5 5
6
5 /
7
10
11
1 /
17 19
1 /
8
4
2
8
2
8
8
4
2
2
2
4
4
Number of Bolts Diameter of Bolts
4 4 4 4 4 8 8 8 8 8 8 12 12 16 20
1 /
5 /
5 /
5 /
3 /
5 /
3 /
3 /
7 /
7 /
1 1 1 1 / 8
1
1 /
1
1 /
2
8
8
8
4
8
4
4
8
8
4
4
8 600 lb steel flanges have a 1/4” raised face which is NOT included in the flange thickness dimensions.
80
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