PIPE, FITTING & FLANGE SPECIFICATIONS
FLANGE STANDARDS – Dimensional Data in inches
125 lb. CAST IRON
ANSI STANDARD B16.1
PIPE SIZE
1 /
3 /
1 /
1 /
1 /
1 /
1 1
1
2 6
2
3
3
4 9
5
6
8 10 12
2
4
4
2
2
2
Diameter of Flange
– – – – –
– – – – –
4 1 /
4
5 /
5
7 7
1 /
8
1 /
10
11 13
1 /
16 19
4
8
2
2
2
Thickness of Flange (min) a Diameter of Bolt Circle
7 /
1 /
9 /
5 /
11 /
3 /
13 /
15 /
15 /
1
1
1 /
1
3 /
1
1 /
16
2
16
8
16
4
16
16
16
8
16
4
3 1 /
3
1 /
3
7 /
4
3 /
5
1 /
6 7 7
1 /
8
1 /
9
1 /
11
3 /
4 14
1 /
17
8
2
8
4
2
2
2
2
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
a 125 lb. Cast Iron Flanges have plain faces (i.e. not raised faces).
250 lb. CAST IRON
ANSI STANDARD B16.1
PIPE SIZE
1 /
3 /
1 /
1 /
1 /
1 /
1
1
1
2 2
3 3
4
5
6
8 10 12
2
4
4
2
2
2
Diameter of Flange
– – – – – –
– –
4 7 /
5
1 /
6
1 /
6
1 /
7
1 /
8
1 / 1 /
9 10
11 12
1 /
15 17
1 /
2 20
1 /
8
4
8
2
2
4
2
2
Thickness of Flange (min) b Diameter of Raised Face Diameter of Bolt Circle
11 /
3 /
13 /
7 /
1 1
1
3 / 5 /
1
1 /
1
3 /
1
7 /
1
5 /
1
7 /
2
16
4
16
8
8
16
4
8
16
8
8
– 2 11 /
16 3
1 /
3
9 /
4
3 /
16 4
15 /
16 5
11 /
16 6
16 6
15 /
16 8
5 /
16 9
11 /
16 11
15 /
16 14
1 /
16 16
7 /
16
16
16
– – –
3 1 /
3
7 /
4
1 /
5 5
7 /
6
5 /
7
1 /
7
7 /
9
1 /
10
5 /
13 15
1 /
4 17
3 /
2
8
2
8
8
4
8
4
8
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
b 250 lb. Cast Iron Flanges have a 1/16” raised face which is included in the flange thickness dimensions.
150 lb. BRONZE
ANSI STANDARD B16.24
PIPE SIZE
1 /
3 /
1 /
1 /
1 /
1 /
1 1
1
2
2
3
3
4 9
5
6
8 10 12
2
4
4
2
2
2
Diameter of Flange
3 1 /
3
7 /
4
1 /
4
5 /
5
6 7 7
1 /
8
1 /
10
11 13
1 /
16 19
2
8
4
8
2
2
2
Thickness of Flange (min) c Diameter of Bolt Circle
5 /
11 /
3 /
13 /
7 /
1 /
9 /
5 /
11 /
11 /
3 /
13 /
15 /
1 1
1 /
16
32
8
32
16
2
16
8
16
16
4
16
16
16
2 3 /
2
3 /
3
1 /
3
1 /
3
7 /
4
3 /
5
1 /
6 4
7 8
7
1 /
8
1 /
9
1 /
11
3 /
4 14
1 /
17
8
4
8
2
8
4
2
2
2
2
4
Number of Bolts Diameter of Bolts
4
4
4
4
4
4
4
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
c 150 lb. Bronze Flanges have plain faces (i.e. not raised faces) with two concentric gasket-retaining grooves between the port and the bolt holes.
300 lb. BRONZE
ANSI STANDARD B16.24
PIPE SIZE
1 /
3 /
1 /
1 /
1 /
1 /
1 1
1
2
2
3
3
4
5
6
8 10 12
2
4
4
2
2
2
Diameter of Flange
3 3 /
4
5 /
4
7 /
5
1 /
6
1 /
6
1 /
7
1 /
8
1 /
9
10
11 12
1 /
15
– – – – –
– – – – –
4
8
8
4
2
2
2
4
2
Thickness of Flange (min) d Diameter of Bolt Circle
1 /
17 /
19 /
5 /
11 /
3 /
13 /
29 /
31 /
1
1 /
1 9
1 / 1 /
1
3 /
1
3 /
2
32
32
8
16
4
16
32
32
16
8
16
8
2 5 /
3
1 /
3
1 /
3
7 /
4
1 /
5 5
7 /
6
5 /
7
1 /
7
7 /
10
5 /
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
d 300 lb. Bronze Flanges have plain faces (i.e. not raised faces) with two concentric gasket-retaining grooves between the port and the bolt holes.
62
www.watsonmcdaniel.com •• Pottstown PA • USA • Tel: 610-495-5131
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