BOLTING DIMENSIONS FOR 300 LB.FLANGES

Nom.
Pipe
Size
300 Lb.Steel Flanges
Dia.
of Bolt
Circle
Dia.

Bolts
No.

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.