BOLTING DIMENSIONS FOR 300 LB. FLANGES

Nom.
Pipe
Size
300 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
2-5/8
1/2
4
2-1/2
2
3/4
3-1/4
5/8
4
2-3/4
2-1/2
1
3-1/2
5/8
4
3
2-1/2
1-1/4
3-7/8
5/8
4
3
2-3/4
1-1/2
3-1/2
3/4
4
3-1/2
3
2
5
5/8
8
3-1/4
3
2-1/2
5-7/8
3/4
8
3-3/4
3-1/4
3
6-5/8
3/4
8
4
3-1/2
3-1/2
7-1/4
3/4
8
4-1/4
3-3/4
4
7-7/8
3/4
8
4-1/4
3-3/4
5
9-1/4
3/4
8
4-1/2
4
6
10-5/8
3/4
12
4-3/4
4-1/4
8
13
7/8
12
5-1/4
4-3/4
10
15-1/4
1
16
6
5-1/4
12
17-3/4
1-1/8
16
6-1/2
5-3/4
14
20-1/4
1-1/8
20
6-3/4
6
16
22-1/2
1-1/4
20
7-1/4
6-1/2
18
24-3/4
1-1/4
24
7-1/2
6-3/4
20
27
1-1/4
24
8
7
22
29-1/4
1-1/2
24
8-3/4
7-1/2
24
32
1-1/2
24
9
7-3/4
26
34-1/2
1-5/8
28
10
8-3/4
30
39-1/4
1-3/4
28
11-1/4
10
34
43-1/2
1-7/8
28
12-1/4
10-3/4
36
46
2
32
12-3/4
11-1/4
42
52-3/4
2
36
13-3/4
13

The size and number of bolts and the bolt circle diameter of 250 lb. cast iron flanges are the same as shown for 300 lb. steel flanges.