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Flange Hole Diameter Reference Chart for Flange Wizard Tools


NOTE: Refer to the chart showing the pressure of your pipe; then find your pipe size. Chart will show you the number of holes in your standard flange and the diameter of the holes

Forged Steel Flanges - 150 lb
PIPE SIZE
(inch)
No. of
Holes
Diameter of Hole
(inch)
1/2
4
5/8
3/4
4
5/8
1
4
5/8
1-1/4
4
5/8
1-1/2
4
5/8
2
4
¾
2-1/2
4
¾
3
4
¾
3-1/2
8
¾
4
8
¾
5
8
7/8
6
8
7/8
8
8
7/8
10
12
1
12
12
1
14
12
1-1/8
16
16
1-1/8
18
16
1-1/8
 
Forged Steel Flanges - 300 lb
PIPE SIZE
(inch)
No. of
Holes
Diameter of Hole
(inch)
1/2
4
5/8
3/4
4
¾
1
4
¾
1-1/4
4
¾
1-1/2
4
7/8
2
8
7/8
2-1/2
8
7/8
3
8
7/8
3-1/2
8
7/8
4
8
7/8
5
8
7/8
6
12
7/8
8
12
1
10
16
1-1/8
12
16
1-1/8
14
20
1-1/8
16
20
1-3/8
18
24
1-3/8
 
Forged Steel Flanges - 400 lb
PIPE SIZE
(inch)
No. of
Holes
Diameter of Hole
(inch)
1/2
4
5/8
3/4
4
¾
1
4
¾
1-1/4
4
¾
1-1/2
4
7/8
2
8
7/8
2-1/2
8
7/8
3
8
7/8
3-1/2
8
1
4
8
1
5
8
1
6
12
1
8
12
1-1/8
10
16
1-1/8
12
16
1-3/8
14
20
1-3/8
16
20
1-1/2
18
24
1-1/2
 
Forged Steel Flanges - 600 lb
PIPE SIZE
(inch)
No. of
Holes
Diameter of Hole
(inch)
1/2
4
5/8
3/4
4
¾
1
4
¾
1-1/4
4
¾
1-1/2
4
7/8
2
8
7/8
2-1/2
8
7/8
3
8
7/8
3-1/2
8
1
4
8
1
5
8
1-1/8
6
12
1-1/8
8
12
1-1/4
10
16
1-3/8
12
20
1-3/8
14
20
1-1/2
16
20
1-5/8
18
20
1-3/4
 
Forged Steel Flanges - 900 lb
PIPE SIZE
(inch)
No. of
Holes
Diameter of Hole
(inch)
1/2
4
7/8
3/4
4
7/8
1
4
1
1-1/4
4
1
1-1/2
4
1
2
8
1
2-1/2
8
1-1/8
3
8
1-1/8
4
8
1-1/4
5
8
1-1/4
6
12
1-1/4
8
12
1-1/2
10
16
1-1/2
12
20
1-1/2
14
20
1-5/8
16
20
1-3/4
18
20
2
 
Forged Steel Flanges - 1500 lb
PIPE SIZE
(inch)
No. of
Holes
Diameter of Hole
(inch)
1/2
4
7/8
3/4
4
7/8
1
4
1
1-1/4
4
1
1-1/2
4
1
2
8
1
2-1/2
8
1-1/8
3
8
1-1/4
4
8
1-3/8
5
8
1-5/8
6
12
1-1/2
8
12
1-3/4
10
12
2
12
16
2-1/8
14
16
2-3/8
16
16
2-3/8
18
16
2-7/8