BOLTING DIMENSIONS FOR 150 LB. FLANGES

Nom.
Pipe
Size
150 Lb. Steel Flanges
Dia.
of Bolt
Circle
Dia.
of
Bolts
No.
of
Bolts
Length of Bolts
Stud Bolts
Raised Face
Machine Bolts
Raised Face
1/2
2-3/8
1/2
4
2-1/4
1-3/4
3/4
2-3/4
1/2
4
2-1/4
2
1
3-1/8
1/2
4
2-1/2
2
1-1/4
3-1/2
1/2
4
2-1/2
2-1/4
1-1/2
3-7/8
1/2
4
2-3/4
2-1/4
2
4-3/4
5/8
4
3
2-3/4
2-1/2
5-1/2
5/8
4
3-1/4
3
3
6
5/8
4
3-1/2
3
3-1/2
7
5/8
8
3-1/2
3
4
7-1/2
5/8
8
3-1/2
3
5
8-1/2
3/4
8
3-3/4
3-1/4
6
9-1/2
3/4
8
3-3/4
3-1/4
 8
11-3/4
3/4
8
4
3-1/2
10
14-1/4
7/8
12
4-1/2
3-3/4
12
17
7/8
12
4-1/2
4
14
18-3/4
1
12
5
4-1/4
16
21-1/4
1
16
5-1/4
4-1/2
18
22-3/4
1-1/8
16
5-3/4
4-3/4
20
25
1-1/8
20
6
5-1/4
22
27-1/4
1-1/4
20
6-1/2
5-1/2
24
29-1/2
1-1/4
20
6-3/4
5-3/4
26
31-3/4
1-1/4
24
7
6
30
36
1-1/4
28
7-1/4
6-1/4
34
40-1/2
1-1/2
32
8
7
36
42-3/4
1-1/2
32
8-1/4
7
42
49-1/2
1-1/2
36
8-3/4
7-1/2

Stud lengths for lap joint flanges are equal to lengths shown plus the thickness of two laps of the stub ends.

The size and number of bolts and the bolt circle diameter of 125 lb. cast iron flanges are the same as shown for 150 lb. steel flanges.