FLANGE HOLE DIAMETER REFERENCE CHARTS
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
|
| 
